From Irix:
We would like to announce and confirm that there are no issues with Irix lenses, as regards their general operation for the Canon EF mount in their current line-up when used on the Canon EOS R camera, and as released by the Canon Corporation via their Canon EOS R Adapter (Canon EF to Canon EOS R mount).
Thanks to this, it is possible to control the aperture from the camera, information about the distance transmitted to which the lens is focused, and to save full information about the exposure parameters in the EXIF format.
Compatible Irix lenses:
- Irix 11mm f/4
- Irix 15mm f/2.4
- Irix 150mm f/2.8 1:1 Macro
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Is there a difference in manual focus accuracy between RF and EF lenses or are they comparable in their accuracy in manual focus?
Good question about RF being any better than EF, including third party.
Your comments about the focus guides are interesting. I had assumed that when the guides coincide and illuminate green that this was akin to focus assist confirming that focus has been achieved with a DSLR and was based on the camera evaluating the sharpness of the image. Are you referring to the indication with the guides when your desired subject is out of focus as to whether you are focused too close or too far must use information from the lens? Can you please expand on how the focus guides work?
In that case maybe it is the problem I encountered with MF or one shot AF in macro / closeup at high apertures: After focusing I move a little bit and the distance between lens and object doesn't fit. With tripod you have "laboratory" conditions so "one shot MF" works well.
"One shot MF" is a source of unfocused images but after some trial and error I used the classical "move the camera along the optical axis"-technique and shutter was released when focus peaking was visible in the region of interest.
Just yesterday I put my M50 and the EF-M 32 @ f/1.4 in MF mode to find out, WHICH regions of the image will be sharp and it worked well. The object size was about 50 x 70mm so DOF was very thin.
One caveat of (Canons?) focus peaking is that it is only sensitive to vertical lines (in landscape orientation) - in my experience the quality of the focus peaking varies between different subjects.
Hopefully not too many trivial remarks - just my 2ct.