These Lenses are known to work with the Letus Canon EF / EOS Mount

• Canon EF Lenses
• Canon EF “L” Lenses ¹⁾
• Canon EF-S Lenses - APS-C (not full frame)

• EF 85mm f/1.2L II USM This lens will not manually focus unless attached to a Canon body.

Image stabilization enabled lenses, this feature is disabled since the Letus EF mount does not have an electronic interface.

Canon's “Luxury” line of lenses, these lens have very high quality optics and build material, these lenses are identifiable by the red ring surrounding the lens.

Canon EF-S lenses are designed specifically to be used with cameras with a APS-C sensor (not full frame) sensors. Theses lenses can be used, but you will have to zoom in further on the ground glass to eliminate vignetting.

These lenses contain Ultrasonic Motor Drive for auto focusing, this feature will not work since the Letus EF mount does not have an electronic interface.

If your Canon EF/EOS lens has an electronic iris, you will need to adjust your aperture with the lens attached to the body of an EOS camera. Here is the process for setting the f-stop using an EOS body:

1. Attach the Canon lens to your SLR Camera
2. Set Camera to AV priority
3. Set the desired aperture on the lens
4. Depress the preview button and while holding it down detach the lens
5. The lens will now retain that aperture setting
6. You can now attach the lens to a Letus35 adapter

Canon L Lens
Canon EF Mount
Canon EF-S Mount