EF-Mount Adapter Rings

  • Female or Male Adapter Ring for Canon's EF-Mount Lenses or Cameras
  • Directly Compatible with SM2-Threaded (2.035"-40) Components
  • Great for Custom Imaging Applications

Application Idea

SM2CEFM EF-Mount Adapter Ring Shown with Post, Base, Lens Tube, EF-Mount Lens and SM2RC Mount.


Female EF-Mount
External SM2 (2.035"-40) Threading


Male EF-Mount
External SM2 (2.035"-40) Threading


Related Items

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SM2CEFM2 Male EF-Mount Adapter
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The SM2CEFM2 easily secures a Ø2" lens tube and lens to an EF-Mount-compatible Canon camera. Lens and lens tube are sold separately. Canon cameras are not available from Thorlabs.


  • Female EF-Mount Connects to Canon Lens
  • Male EF-Mount Connects to Canon Camera
  • External SM2 (2.035"-40) Threading for Compatibility with Ø2" Lens Tubes and Components

Thorlabs' EF-Mount Adapter Rings allow for easy integration of Canon EF-Mount lenses and cameras into experimental setups using Thorlabs' optomechanical components. The SM2CEFM adapter features female EF-Mounting, making it ideal for integrating Canon EF-mount-compatible lenses into Thorlabs cage systems and DIY Cerna setups. The SM2CEFM2 adapter features male EF-Mounting, giving the option to combine Canon EF-mount-compatible cameras with Thorlabs optics, as shown in the image below. On the side opposite of the EF-mounting hardware, both adapters feature SM2 (2.035"-40) external threading, and thus are directly compatible with Thorlabs' internally SM2-threaded components, such as our Ø2" lens tubes.

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EF-Mount Adapter Rings

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
SM2CEFM Support Documentation
SM2CEFMCustomer Inspired! Adapter with External SM2 Threads and Female EF-Mounting Ring
SM2CEFM2 Support Documentation
SM2CEFM2Customer Inspired! Adapter with External SM2 Threads and Male EF-Mounting Ring