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Manual Continuous Rotation Mounts


  • Lockable Rotation Mounts for Ø1/2", Ø1", and Ø2" Optics
  • All Models Offer 360° Rotation
  • SM-Threaded Optic Bores

RSP2D

Ø2" Rotation Mount with Adjustable Zero

RSP05

Ø1/2" Rotation Mount

DLM1

Ø1" Dual Rotation Mount

RSP1X15

Indexing Rotation Mount for Discrete 15° Rotation

Application Idea

CLR1 Rotation Mount Lets Optic Rotate While Lens Tubes Remain Fixed (All Sold Separately)

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Features

  • Rotation Mounts with 360° Continuous Rotation
  • Rotational Position Lockable via Setscrew
  • Full 360° Engraved Scale Marked in 2° Increments
  • SM05-, SM1-, or SM2-Threaded Optic Bore
  • Post Mountable via 8-32 (M4) Tap (Except Item # CRM05)

Thorlabs offers a diverse line of continuous rotation mounts to accommodate a variety of optic sizes and applications. These mounts provide smooth, backlash-free rotation in a compact, lockable package. To mount an optic, simply place it within the central SM-threaded bore and secure it using a spanner wrench with the included retaining ring.

The standard RSP rotation mounts are available for Ø1/2", Ø1", and Ø2" optics. An easy-to-read radial scale offers 2° graduation marks, labeled every 20°, for precise incremental movement and repeatable positioning. The RSP1D(/M) and RSP2D(/M) mounts allow the front dial face to be rotated separately from the optic cell and then locked down. This allows the engraved scale to be aligned with an axis of the optic, such as the fast axis of a waveplate.

For applications that require rotation in discrete increments, we offer the RSP1X15(/M) and RSP1X225(/M) mounts for Ø1" optics. These mounts have a top-located setscrew [5/64" (2.0 mm) hex] that, when loosened, allows for continuous 360° motion. With the setscrew tightened, the mount can be rotated through a number of indexed positions in discrete motions.

The DLM1(/M) Dual Rotation Mount features two independently rotating optic carriages that allow two optics to be mounted in close proximity. The carriages are magnetically attached to the main body of the mount so that they can be removed and replaced as needed. Extra optic carriages are available separately.

Our CRM05 rotation mount holds a Ø1/2" optic up to 0.26" (6.5 mm) thick and includes external SM1 (1.035"-40) threads. It is ideal for integrating Ø1/2" optics into SM1 lens tube or 30 mm cage cube systems. By contrast, the CLR1(/M) rotation mount was designed to orient rotationally sensitive Ø1" optics within SM1 lens tube systems. Round cylindrical lenses, wave plates, and other polarization optics are commonly used with this mount. Unlike our other rotation mounts, this mount allows for lens tubes to be attached to either end and remain stationary as the mounted optic is rotated.

Thorlabs also offers rotation mounts that are compatible with our 16 mm, 30 mm, and 60 mm cage systems. For demanding applications, we offer high-resolution, micrometer-driven rotation mounts providing roughly 2.4 arcmin per micrometer division.

Quick Links
Product Image
(Click to Enlarge)
RSP05 CRM05 RSP1 DLM1 RSP1D CLR1 RSP1X15 RSP2 RSP2D
Item # RSP05(/M) CRM05 RSP1(/M) DLM1(/M) RSP1D(/M) CLR1(/M) RSP1X15(/M)
RSP1X225(/M)
RSP2(/M) RSP2D(/M)
Optic Size Ø1/2" Ø1/2" Ø1" Ø1" Ø1" Ø1" Ø1" Ø2" Ø2"
Internal Threading SM05 (0.535"-40) SM05 (0.535"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM1 (1.035"-40) SM2 (2.035"-40) SM2 (2.035"-40)
Features Standard Ø1/2" Rotation Mount External SM1 (1.035"-40) Threads Standard Ø1" Rotation Mount Two Independently Rotating Carriages Adjustable Zero Rotates Optic Within Fixed Lens Tube System Continuous 360° or Discrete 15° or 22.5° Rotation Standard Ø2" Rotation Mount Adjustable Zero
Post Mounting 8-32 (M4) Tap None 8-32 (M4) Tap 8-32 (M4) Tap 8-32 (M4) Tap 8-32 (M4) Tap 8-32 (M4) Tap 8-32 (M4) Tap 8-32 (M4) Tap

Thorlabs' Threading Specifications

Thorlabs' lens tubes utilize a series of non-standard threadings. Threading specifications are given below for our SM threadings utilized in our lens tube and cage system components so that you can machine mating components to suit your application. We also offer products with C-Mount and RMS threadings, and the specifications for these threadings are also given below. Please note that other manufacturers may have different tolerances for these threads. For other thread specifications that are not listed here, please contact Tech Support.

SM05 Threading: Ø1/2" Lens Tubes, 16 mm Cage Systems
External Thread, 0.535"-40.0, UNS-2A Internal Thread, 0.535"-40.0, UNS-2B
Max Major Diameter 0.5340" Min Major Diameter 0.5350"
Min Major Diameter 0.5289" Min Pitch Diameter 0.5188"
Max Pitch Diameter 0.5178" Max Pitch Diameter 0.5230"
Min Pitch Diameter 0.5146" Min Minor Diameter (and 83.3% of thread) 0.508"
Max Minor Diameter 0.5069" Max Minor Diameter (and 64.9% of thread) 0.514"
RMS Threading: Objective, Scan, and Tube Lenses
External Thread, 0.800"-36.0, UNS-2A Internal Thread, 0.800"-36.0, UNS-2B
Max Major Diameter 0.7989" Min Major Diameter 0.8000"
Min Major Diameter 0.7934" Min Pitch Diameter 0.7820"
Max Pitch Diameter 0.7809" Max Pitch Diameter 0.7866"
Min Pitch Diameter 0.7774" Min Minor Diameter (and 83.3% of thread) 0.770"
Max Minor Diameter 0.7688" Max Minor Diameter (and 64.9% of thread) 0.777"
C-Mount Threading: Machine Vision LensesCCD/CMOS Cameras
External Thread, 1.000"-32.0, UN-2A Internal Thread, 1.000"-32.0, UN-2B
Max Major Diameter 0.9989" Min Major Diameter 1.0000"
Min Major Diameter 0.9929" Min Pitch Diameter 0.9797"
Max Pitch Diameter 0.9786" Max Pitch Diameter 0.9846"
Min Pitch Diameter 0.9748" Min Minor Diameter (and 83.3% of thread) 0.966"
Max Minor Diameter 0.9651" Max Minor Diameter (and 64.9% of thread) 0.974"
SM1 Threading: Ø1" Lens Tubes, 30 mm Cage Systems
External Thread, 1.035"-40.0, UNS-2A Internal Thread, 1.035"-40.0, UNS-2B
Max Major Diameter 1.0339" Min Major Diameter 1.0350"
Min Major Diameter 1.0288" Min Pitch Diameter 1.0188"
Max Pitch Diameter 1.0177" Max Pitch Diameter 1.0234"
Min Pitch Diameter 1.0142" Min Minor Diameter (and 83.3% of thread) 1.008"
Max Minor Diameter 1.0068" Max Minor Diameter (and 64.9% of thread) 1.014"
SM30 Threading: Ø30 mm Lens Tubes
External Thread, M30.5x0.5 Internal Thread, M30.5x0.5
Max Major Diameter 30.480 mm Min Major Diameter 30.500 mm
Min Major Diameter 30.371 mm Min Pitch Diameter 30.175 mm
Max Pitch Diameter 30.155 mm Max Pitch Diameter 30.302 mm
Min Pitch Diameter 30.059 mm Min Minor Diameter (and 83.3% of thread) 29.959 mm
Max Minor Diameter 29.938 mm Max Minor Diameter (and 64.9% of thread) 30.094 mm
SM2 Threading: Ø2" Lens Tubes, 60 mm Cage Systems
External Thread, 2.035"-40.0, UNS-2A Internal Thread, 2.035"-40.0, UNS-2B
Max Major Diameter 2.0338" Min Major Diameter 2.0350"
Min Major Diameter 2.0287" Min Pitch Diameter 2.0188"
Max Pitch Diameter 2.0176" Max Pitch Diameter 2.0239"
Min Pitch Diameter 2.0137" Min Minor Diameter (and 83.3% of thread) 2.008"
Max Minor Diameter 2.0067" Max Minor Diameter (and 64.9% of thread) 2.014"
SM3 Threading: Ø3" Lens Tubes
External Thread, 3.035"-40.0, UNS-2A Internal Thread, 3.035"-40.0, UNS-2B
Max Major Diameter 3.0337" Min Major Diameter 3.0350"
Min Major Diameter 3.0286" Min Pitch Diameter 3.0188"
Max Pitch Diameter 3.0175" Max Pitch Diameter 3.0242"
Min Pitch Diameter 3.0133" Min Minor Diameter (and 83.3% of thread) 3.008"
Max Minor Diameter 3.0066" Max Minor Diameter (and 64.9% of thread) 3.014"
Figure 1: Vernier scale measuring 75.60
Click to Enlarge

Figure 1: An example of how to read a vernier scale. The red arrow indicates what is known as the pointer. Since the tick mark labeled 10 on the vernier scale aligns with one of the tick marks on the main scale, this vernier scale is reading 75.60 (in whatever units the tool measures).

Reading a Vernier Scale

Vernier scales are typically used to add precision to standard, evenly divided scales (such as the scale on Thorlabs' rotation mounts). A vernier scale has found common use in many precision measurement tools, the most common being calipers and micrometers. The direct vernier scale uses two scales side-by-side: the main scale and the vernier scale. The vernier scale has a slightly smaller spacing between its tick marks (10% smaller than the main). Hence, the lines on the main scale will not line up with all the lines on the vernier scale. Only one line from the vernier scale will match well with one line of the main scale, and that is the trick to reading a vernier scale.

Figures 1 through 3 show a vernier scale system for three different situations. In each case, the scale on the left is the main scale, while the small scale on the right is the vernier scale. When reading a vernier scale, the main scale is used for the gross number, and the vernier scale gives the precision value. In this manner, a standard ruler or micrometer can become a precision tool.

The 0 on the vernier scale is the "pointer" (marked by a red arrow in Figs. 1 – 3) and will indicate the main scale reading. In Figure 1 we see the pointer is lined up directly with the 75.6 line. Notice that the only other vernier scale tick mark that lines up well with the main scale is 10. Since the vernier 0 lines up with the main scale's 75.6, the reading from Figure 1 is 75.60 (in whatever units the tool measures in).

That is essentially all there is to reading a vernier scale. It's a very straightforward way of increasing the precision of a measurement tool. To expound, let's look at Figure 2. Here we see that the pointer is no longer aligned with a scale line, instead it is slightly above 75.6, but below 75.7; thus the gross measurement is 75.6. The first vernier line that coincides with a main scale line is the 5, shown with a blue arrow. The vernier scale gives the final digit of precision; since the 5 is aligned to the main scale, the precision measurement for Figure 2 is 75.65.

Since the vernier scale is 10% smaller than the main scale, moving 1/10 of the main scale will align the next vernier marking. This asks the obvious question: what if the measurement is within the 1/10 precision of the vernier scale? Figure 3 shows just this. Again, the pointer line is in between 75.6 and 75.7, yielding the gross measurement of 75.6. If we look closely, we see that the vernier 7 (marked with a blue arrow) is very closely aligned to the main scale, giving a precision measurement of 75.67. However, the vernier 7 is very slightly above the main scale mark, and we can see that the vernier 8 (directly above 7) is slightly below its corresponding main scale mark. Hence, the scale on Figure 3 could be read as 75.673 ± 0.002. A reading error of about 0.002 would be appropriate for this tool.

As we've seen here, vernier scales add precision to a standard scale measurement. While it takes a bit of getting used to, with a little practice, reading these scales is fairly straightforward. All vernier scales, direct or retrograde, are read in the same fashion.

Figure 2: Vernier scale measuring 75.65
Click to Enlarge

Figure 2: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.65.
Figure 1: Vernier scale measuring 75.67
Click to Enlarge

Figure 3: An Example of a vernier scale. The red arrow indicates the pointer and the blue arrow indicates the vernier line that matches the main scale. This scale reads 75.67, but can be accurately read as 75.673 ± 0.002.

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Posted Comments:
Poster:
Posted Date:2017-11-17 00:49:03.503
I'd love to buy a simple rotation mount (like RSP05, RSP1, or RSP2) for 1.5 inch optics.
Poster:marinaphotonics
Posted Date:2016-08-08 10:41:39.05
I have 150 3" wedges and need to put them together in pairs. What would it take to get the RSP2D or similar up to 3"
Poster:nday
Posted Date:2015-11-16 15:12:35.897
I'll likely go with a non-indexing version, but I'd love to see a 30mm cage version of the Indexing Rotation Mounts for Ø1" Optics, RSP1X15 and RSP1x225 and their metric versions. (My specific project would use a RSP1X15.) Great equipment, and I really appreciate how responsive Thorlabs is to customer questions. Thank you!
Poster:besembeson
Posted Date:2015-11-19 10:09:50.0
Response from Bweh at Thorlabs USA: Thanks for your kind words and thanks for the suggestion. We will review this and I will follow up with you to know more about your application. For now we only have 30mm cage-system compatible continuous rotation mounts: http://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1885&pn=CRM1
Poster:
Posted Date:2013-03-27 12:16:01.643
Do you have a Continuous Rotation Mount for Ø1/2" Optics directly mountable on SM1 thread?
Poster:cdaly
Posted Date:2013-04-03 16:12:00.0
Response from Chris at Thorlabs: Thank you for using our web feedback. No we do not have a rotation mount exactly like this, but the CLR1 can be mounted onto an SM1 thread and a half inch optic rotated continuously within using an adapter like SM1A6(T) or AD1.
Poster:olsonaj
Posted Date:2013-03-17 13:54:58.173
do you have a rotation mount that could accommodate a 30mm diameter waveplate? Perhaps with an adapter of some type?
Poster:jlow
Posted Date:2013-03-18 13:35:00.0
Response from Jeremy at Thorlabs: We do not have a 30mm rotation mount. However, we do have the RSP2 which you can use with a SM2A11 adapter and SM30L05 to mount a Ø30mm optic.
Poster:technicalmarketing
Posted Date:2007-08-16 10:41:30.0
Wave plate and polarizer links have been added to the related items tab. Thank you for the suggestion.
Poster:acable
Posted Date:2007-08-15 00:09:19.0
Waveplates and polarizers are the most used optical elements that require a rotation stage, please consider adding to the "Related Item" tab.

Continuous Rotation Mount for Ø1/2" Optics

  • Mount Ø1/2" Optics up to 0.23" (5.8 mm) Thick
  • Compact: 1.00" x 0.87" x 0.45" (25.4 mm x 22.1 mm x 11.4 mm) [L x W x H]
  • Compatible with our SM05-Threaded Lens Tubes
  • One SM05RR Retaining Ring Included
  • Post Mountable via 8-32 (M4) Mounting Tap

With a 1.00" (25.4 mm) height and a 0.45" (11.4 mm) thickness, the RSP05(/M) Ø1/2" rotation mount is an ideal solution for compact optical assemblies. The center aperture accepts Ø1/2" optics up to 0.23" thick (5.8 mm), held in place with a SM05RR retaining ring (one included with RSP05). The knurled edge of the RSP05(/M) and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. A convenient top-located setscrew can be tightened with a 0.05" (1.3 mm) hex key or balldriver to secure the rotational position of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
RSP05 Support Documentation
RSP05Rotation Mount for Ø1/2" (Ø12.7 mm) Optics, 8-32 Tap
$72.00
Today
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RSP05/M Support Documentation
RSP05/MRotation Mount for Ø1/2" (Ø12.7 mm) Optics, M4 Tap
$72.00
Today

SM1-Threaded Continuous Rotation Mount for Ø1/2" Optics


Click to Enlarge

View Imperial Product List
Item #QtyDescription
CRM051SM1-Threaded Rotation Mount for Ø1/2" Optics
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR31Ø1/2" Optical Post, SS, 8-32 Setscrew, 1/4"-20 Tap, L = 3"
CP021SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, 8-32 Tap
View Metric Product List
Item #QtyDescription
CRM051SM1-Threaded Rotation Mount for Ø1/2" Optics
ER3-P41Cage Assembly Rod, 3" Long, Ø6 mm, 4 Pack
SM1L201SM1 Lens Tube, 2.00" Thread Depth, One Retaining Ring Included
TR75/M1Ø12.7 mm Optical Post, SS, M4 Setscrew, M6 Tap, L = 75 mm
CP02/M1SM1-Threaded 30 mm Cage Plate, 0.35" Thick, 2 Retaining Rings, M4 Tap
CRM05 Mount in a 30 mm Cage System

The CRM05 Ø1/2" Rotation Mount is designed with an external SM1 thread (1.035"-40), allowing the mount to be threaded directly onto any internally SM1-threaded device such as SM1 lens tubes or 30 mm cage cubes. The center aperture is SM05-threaded (0.535"-40) and accepts Ø1/2" (Ø12.7 mm) optics up to 0.26" (6.5 mm) thick. Optics are held in the mount with a SM05RR retaining ring (one included). Two notches along the mount's circumference accommodate the SPW801 adjustable spanner wrench to aid in securing the mount into place. The knurled edge of the CRM05 and the 360° laser-engraved scale marked at 2° increments allow for precise, repeatable positioning and fine angular adjustment. Four equally spaced witness lines are engraved into the mount's perimeter, ensuring there is always a witness line in a convenient and easily readable position. The mount can be locked into position using the 0.035" hex setscrew on the outer edge.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available / Ships
CRM05 Support Documentation
CRM05Customer Inspired!SM1-Threaded Rotation Mount for Ø1/2" Optics
$66.50
Today

Continuous Rotation Mount for Ø1" Optics

  • Mount Ø1" Optics up to 0.47" (11.9 mm) Thick
  • Compatible with SM1 Lens Tubes
  • One SM1RR Retaining Ring Included
  • Post Mountable via an 8-32 (M4) Tapped Hole

The RSP1(/M) Continuous Rotation Mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.47" (11.9 mm) thick. Secure the optic with the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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RSP1 Support Documentation
RSP1Rotation Mount for Ø1" (25.4 mm) Optics, 8-32 Tap
$84.50
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
RSP1/M Support Documentation
RSP1/MRotation Mount for Ø1" (25.4 mm) Optics, M4 Tap
$84.50
3-5 Days

Dual Continuous Rotation Mount for Ø1" Optics


Click to Enlarge

The rotating optic carriages can be easily removed from the main body of the mount.
  • Mount Two Ø1" Optics up to 0.25" (6.4 mm) Thick
  • Each Optic Carriage Rotates Independently
  • Rotating Optic Carriages are Interchangeable for Quick Swapping
  • SM1-Threaded Optic Bore in Each Rotating Optic Carriage
  • Two SM1RR Retaining Rings Included
  • Post Mountable via 8-32 (M4) Tap

The DLM1(/M) Dual Rotation Mount includes two independently rotating carriages (item # DLM1-A) for Ø1" optics that offer 360° of continuous rotation. The optic bore of each carriage features internal SM1 (1.035"-40) threading and can hold an optic up to 0.25" (6.4 mm) thick with the included SM1RR retaining ring. The carriages magnetically attach to the main body of the mount. To remove a carriage from the mount, simply pull the carriage off the main body. Another carriage can then be snapped on in its place. Extra DLM1-A interchangeable rotating carriages are available to allow optics to be swapped out quickly and easily.

Each carriage has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments for precise, repeatable positioning. Two top-located setscrews can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the optic carriages independently. When the rotation is locked, the double bore on the mount maintains a stable, three-point contact to hold the optic carriage.

The DLM1 mount is designed to put the optic axis 1.00" above the top of the post. The DLM1/M puts the optic axis 25.0 mm above the top of the post. When two optics are mounted, the separation between them is 0.30" (7.6 mm). The dual rotation mount is ideal for creating variable polarizers and attenuators by mounting linear polarizers and wave plates in close proximity without having to align the optic axes of two separate rotation mounts. We do not recommend using this mount with lens tubes, as the torque applied to the optic bore may overcome the magnetic attachment. Optics in SM1-threaded housings can be mounted to the carriage.

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DLM1 Support Documentation
DLM1NEW!Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, 8-32 Tap
$125.00
Today
+1 Qty Docs Part Number - Universal Price Available / Ships
DLM1-A Support Documentation
DLM1-ANEW!Interchangeable Rotating Carriage for DLM1(/M), One SM1RR Retaining Ring
$30.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
DLM1/M Support Documentation
DLM1/MNEW!Dual Rotation Mount for Ø1" Optics, Two Interchangeable Rotating Carriages, M4 Tap
$125.00
Today

Continuous Rotation Mount for Ø1" Optics with Adjustable Zero


This animation shows the movable scale of the Ø2" RSP2D Mount being rotated to align with the fast axis of a wave plate.
  • Mount Ø1" Optics up to 0.51" (12.9 mm) Thick
  • Dial Face can be Rotated Independently of Mounted Optics
  • 5 arcmin Vernier Scale
  • Compatible with SM1 Lens Tubes
  • One SM1RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP1D(/M) Ø1" Continuous Rotation Mount offers the same features as the RSP1(/M) featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP1 above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM1 threading (1.035"-40) and accepts Ø1" optics up to 0.51" (12.9 mm) thick. Secure the optic's position using the included SM1RR retaining ring. The SM1 threading also provides a means to connect SM1 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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RSP1D Support Documentation
RSP1DRotation Mount for Ø1" (Ø25.4 mm) Optics with Adjustable Zero, 8-32 Tap
$92.75
Today
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RSP1D/M Support Documentation
RSP1D/MRotation Mount for Ø1" (Ø25.4 mm) Optics with Adjustable Zero, M4 Tap
$92.75
Today

Lens Tube Continuous Rotation Mount for Ø1" Optics

This animation shows the CLR1 being installed in an SM1 lens tube setup. The wave plate installed in the CLR1 rotates, while the lens tubes remain stationary.

Click to Enlarge

The CLR1 allows an optic to rotate between two fixed SM1 lens tubes.
  • Holds Ø1" Optics up to 0.27" (6.8 mm) Thick
  • Ideal for Round Cylindrical Lenses
  • Rotationally Align Optics Within a Lens Tube System
  • Post Mountable via 8-32 (M4) Tapped Hole
  • Features SM1 Quick Release Adapter on Back of Mount

The CLR1(/M) is a rotation mount designed for use with Ø1" round cylindrical lenses and other rotationally sensitive optics within a lens tube system. As round cylindrical lenses only focus or expand light in one dimension, they are not easily aligned within a standard lens mount or lens tube. This rotation mount can be sandwiched between two lens tubes to provide rotation of the mounted optic without disturbing the attached lens tubes.

The back side of this mount utilizes an SM1 (1.035"-40) quick release adapter, which allows the mount to be quickly disconnected and reconnected to a lens tube setup. Please note that this adapter must be removed while inserting an optic in the mount, but once the optic is mounted, the adapter can be reattached. A convenient top-located setscrew can be tightened with a 0.05" (1.3 mm) hex key or balldriver to secure the rotational position of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
CLR1 Support Documentation
CLR1Rotatable Ø1" (Ø25.4 mm) Lens Mount, 8-32 Tap
$93.75
Lead Time
+1 Qty Docs Part Number - Metric Price Available / Ships
CLR1/M Support Documentation
CLR1/MRotatable Ø1" (Ø25.4 mm) Lens Mount, M4 Tap
$93.75
3-5 Days

Indexing Rotation Mounts for Ø1" Optics

This animation shows the movable scale of the RSP1X15 being rotated to align with the fast axis of a wave plate; it also shows the engagement of the indexing mechanism.
  • Directly Mounts Ø1" Optics up to 0.50" (12.7 mm) Thick
  • Scale can be Rotated Independently of Mounted Optic for Alignment
  • Switch Between Continuous and Discrete Rotation
    • RSP1X15(/M): Discrete Rotation in 15° Increments
    • RSP1X225(/M): Discrete Rotation in 22.5° Increments
  • 5 arcmin Vernier Scale is Ideal for Polarization Optics
  • One SM1RR Retaining Ring Included
  • Post Mountable via 8-32 (M4) Tap

The RSP1X15(/M) and RSP1X225(/M) rotation mounts for Ø1" optics feature both continuous 360° rotation and stepped rotation in increments of 15° for the RSP1X15(/M) or 22.5° for the RSP1X225(/M). The top of each mount has a setscrew that, when loosened with a 5/64" (2.0 mm) hex key or balldriver, allows for smooth, continuous, 360° rotation. Tightening the setscrew engages a detent mechanism that forces the mount to rotate in discrete increments. The mounted optic is retained in the central SM1-threaded (1.035"-40) bore using the included SM1RR retaining ring.

In addition, the engraved scale can be unlocked and rotated independently of the optic so that the markings can be aligned with respect to the mounted optic. For example, the zero of the engraved scale can be aligned with the fast axis of a wave plate or the polarization axis of a linear polarizer. To help with the alignment, an engraved arrow extends the zero mark all the way to the outside edge of the SM1-threaded bore used to mount the optic. This animation to the right details the operation of the RSP1X15.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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RSP1X15 Support Documentation
RSP1X15Rotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 15° Indexed Rotation, 8-32 Tap
$131.00
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RSP1X225 Support Documentation
RSP1X225Rotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 22.5° Indexed Rotation, 8-32 Tap
$131.00
Today
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RSP1X15/M Support Documentation
RSP1X15/MRotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 15° Indexed Rotation, M4 Tap
$131.00
Today
RSP1X225/M Support Documentation
RSP1X225/MRotation Mount for Ø1" (Ø25.4 mm) Optics, 360° Continuous or 22.5° Indexed Rotation, M4 Tap
$131.00
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Continuous Rotation Mount for Ø2" Optics

  • Mount Ø2" Optics up to 0.51" (13 mm) Thick
  • Compatible with SM2 Lens Tubes
  • One SM2RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2(/M) Continuous Rotation Mount utilizes two precision bearings for smooth rotation. The aperture features internal SM2 (2.035"-40) threading and accepts Ø2" optics up to 0.51" (13 mm) thick as well as any SM2-threaded component. Secure the optic using the included SM2RR retaining ring.

The mount has a knurled edge for rotation. A 360° laser-engraved scale marked at 2° increments allows for precise, repeatable positioning and fine angular adjustment. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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RSP2 Support Documentation
RSP2Rotation Mount for Ø2" (Ø50.8 mm) Optics, 8-32 Tap
$158.00
Today
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RSP2/M Support Documentation
RSP2/MRotation Mount for Ø2" (Ø50.8 mm) Optics, M4 Tap
$158.00
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Continuous Rotation Mount for Ø2" Optics with Adjustable Zero


This animation shows the movable scale of the RSP2D Mount being rotated to align with the fast axis of a wave plate.
  • Mount Ø2" Optics up to 0.54" (13.7 mm) Thick
  • Dial Face can be Rotated Independently of Mounted Optics
  • 5 arcmin Vernier Scale
  • Compatible with SM2 Lens Tubes
  • One SM2RR Retaining Ring Included
  • Bottom-Located 8-32 (M4) Tapped Hole for Post Mounting

The RSP2D(/M) Ø2" Continuous Rotation Mount offers the same features as the RSP2 featured above but also incorporates a rotatable dial that can be used, for example, to align a wave plate's optical axis after mounting. Like the RSP2(/M) above, this mount utilizes two precision bearings for smooth, backlash-free rotation. The aperture is threaded with our internal SM2 threading (2.035"-40) and accepts Ø2" optics up to 0.54" (13.7 mm) thick. Secure the optic's position using the included SM2RR retaining ring. The SM2 threading also provides a means to connect SM2 lens tubes and other Thorlabs components to the mount.

This mount has a knurled edge for adjusting rotation and a 360° laser-engraved scale marked at 2° increments to allow for precise, repeatable positioning and fine angular adjustment. The front dial scale can be unlocked and rotated using a 5/64" (2.0 mm) hex key so that the scale can be aligned to the axis of an optic for calibration purposes. A top-located setscrew can be tightened with a 5/64" (2.0 mm) hex key or balldriver to lock the rotation of the mount.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Imperial Price Available / Ships
RSP2D Support Documentation
RSP2DRotation Mount for Ø2" (Ø50.8 mm) Optics with Adjustable Zero, 8-32 Tap
$142.00
Today
+1 Qty Docs Part Number - Metric Price Available / Ships
RSP2D/M Support Documentation
RSP2D/MRotation Mount for Ø2" (Ø50.8 mm) Optics with Adjustable Zero, M4 Tap
$142.00
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Last Edited: Sep 11, 2013 Author: Dave Gardner