Mount T-mount optics to your Canon EOS EF-mount camera body using this T-Ring with M42 Thread from Neewer. The M42 x 0.75" threaded side of the T-ring is compatible with most 1.25" telescope eyepieces and accessories. Made of black anodized aluminum, this piece also prevents reflections and lens flare for dynamic astronomical photography.

Standard M42 x 0.75" Thread    For Telescope Eyepieces and Accessories    Aluminum Alloy Construction    Prevents Reflections and Flare

The T-ring has no electronic communication, so automatic camera functions, such as focus and other functions, will not be available and must be set manually.

Related Questions and Answers

Q: 1. I own a Canon 6D and a 5D M-III. I want to use these lenses on my new Sony A6400. Is this the correct adapter to purchase to fit my Sony E mount? I don't mind that it's not an electronic adapter.

A: If using Canon EF lenses originally for your Canon DSLRs on a Sony A6400 with an E mount, the Commlite Electronic Autofocus Lens Mount Adapter for Canon EF or EF-S-Mount Lens to Sony E-Mount Camera, BH # COCMEFNEXB would be a much better option. https://bhpho.to/3r6EOfG

Q: 2. What is the size of threads 49mm or 52mm? I need 52mm to canon EF mount ! Thanks

A: A T mount is M42, it is not the traditional threading, it is meant to attach to a Canon camera and then attach it to a telescope or other T mount optic.

Q: 3. If I was to mount a Canon EF 70-200mm f/4L on this adapter will it still have f/4 maximum aperture?

A: Yes

Q: 4. Does the control ring mount adapter come with dusk covers for the RF and EF sides? Or are they separately purchased?

A: Yes the adapter comes with the front and rear caps.

Q: 5. I assume this will work with the R3 when it comes out. Is this correct?

A: The Canon Control Ring Mount Adapter EF-EOS R is compatible with the Canon EOS R3 camera.

Q: 6. used with Rebel cameras do I also need an EF-S to EOS adapter?

A: Nope! This will work with EF and EF-S cameras without an adapter. You will only need another adapter if you have the mirrorless line of Canon cameras, the EF-M.

Q: 7. Will this adapter work in Video mode or just Photo mode?

A: This adapter works in both Photo and Video mode.

Q: 8. Can I attach this to the Ef to RF adapter for use on my R6?

A: You need to use an RF T-mount adapter, like this one: https://www.bhphotovideo.com/c/product/1494990-REG/vivitar_hf_t2_eos_r_t_mount_to_canon_rf_mount.html

Q: 9. Why are you copying Fotodiox?

A: In reality, Fotodiox (a good company I do like, and I do use many of their products) is actually copying Canon. Canon makes the cameras with RF mounts and dictates the correct mechanical and electronic standards for them. Canon makes the RF lenses, EF lenses and EF-S lenses and dictates the correct mechanical, optical and electronic specifications for them. Fotodiox is riding on Canon's coat tails, and is only able to manufacture adapters thate are possibly "Canon comatible" because Canon allows it.

Q: 10. I have a Celstron Nexstar C60 22062. I'm trying to find out if it can accept a camera mount. Would you have any data in this regard?

A: I believe you could use this adapter in combination with Celestron #93625, which claims to work with all refractors. However, I have not personally used it.