Connecting Canon EOS R cameras to T2 and M48 lenses and telescopes
Canon R mirrorless cameras use a different thread than that found in old Canon EOS DSLR. Existing adapters won't work, although there are Canon R to Canon ES adapters and you could try your from that.
Among new adapters, we have quite a few options, found on Aliexpress and in local photographic equipment shops.
Canon R to T2 lens adapter
Lens adapters like the T2 or EOS EF/EF-S aside from changing the thread also try to set the sensors in the correct back-focus distance from the lens. That's why this T2 adapter is so tall.
![K&F Concept T2 lens adapter](/media/MuFgw7tK_5-600.avif)
![Canon R50 connected to a Newtonian telescope](/media/LJldsjDr0P-600.avif)
It can also be used in Astrophotography or when adapting smaller telescopes for standard photography, but depending on your scope choice you may be limited on back focus and then a low-profile version will be required.
I did a few test shots with Canon R50 and 200/800 Newtonian (f/4) and at such focal lengths, air turbulence starts to play a role (and wind shaking the tree). Newtonian at f/4 will require perfect collimation and a comma corrector (used in the shots below). The focus depth for daytime photographs will be very small.
![Canon R50 and a Newtonian as a lens](/media/vwkIXLc7Bi-600.avif)
![Canon R50 and a Newtonian as a lens](/media/iN1ZJD5g_k-600.avif)
![Canon R50 and a Newtonian as a lens](/media/SKudO7y2Rw-600.avif)
Canon R to M48 thread adapter
This is a low-profile adapter I got cheap from Aliexpress. It's wider than T2 and has better compatibility with 2" accessories that often use M48 thread.
With a RedCat 51 refractor (f/4.9 51/250mm) I managed to get some shots from hand when chasing birds. This refractor does have a very limited backfocus and even with this adapter it is limited by it for short-range focus.
![Canon R to M48 thread adapter](/media/Ds_J_OJlTE-600.avif)
![Canon R to M48 thread adapter](/media/9r4E9cFp1m-600.avif)
![Canon R50 and RedCat 51](/media/_Yw4fff8tp-600.avif)
![Canon R50 and RedCat 51](/media/m66HJeKWAK-600.avif)
![Canon R50 and RedCat 51](/media/Jy73xNyZMe-600.avif)
![Canon R50 and RedCat 51](/media/TlYz5INZaf-600.avif)
![Canon R50 and RedCat 51](/media/uA8JyXMxwL-600.avif)
![Canon R50 and RedCat 51](/media/vMMcZfLrH5-600.avif)
![Canon R50 and RedCat 51](/media/BdvrcOy7t6-600.avif)
To use Canon R cameras with a manual lens you have to set it to manual mode (like the M
mode) and then enter the menu and allow shutter release without a lens (as the lens is completely manual with no electronics and the camera has no idea about it).
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