Quote:
Originally Posted by gregbradley
For mounting on a telescope yes it will need a T mount but the existing T mount would still fit on the EF adapter that sells with the EOS R.
2 adapters would not be ideal though but it would work. I can't imagine it will take long for a bunch of T mount adapters becoming available on Ebay for the EOS R.
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As long as these mounts fit well without any play it won't be a problem.
But surely, in the near future tere well be Chinese vendors on ebay offering an RF/T or RF/M42 (the often used Praktica thread mount for many older lenses used in AP) or RF/FD (the old pre-1988 Canon mount) adapters.
AF won't work obviously, but light metering should theoretically work with a non-official lens (as a 6D does correct light metering with a telescope or even a toilet roll + spectacle glass mounted on it), unless Canon blocks out light metering when a non-Canon lens is mounted.
But expensive body ? Well, the EOS R body + EF-RF adapter is barely more expensive than a 6DII body.
If I need a new DSLR now while having a bunch of EF lenses, I'd rather buy an R than a 6DII (actually an R is a 6DIII as it is an 'entry level' full frame DSLR from Canon, despite having a 5DiV sensor).
But my 6D1 still works well.