EOS R6 Mark II, EF 24-70mm f/2.8L II USM, EF-EOS R adapter vignette

[vgrafr]

Just got the Canon R6m2 and the Canon Mount Adapter EF-EOS R.  Put my Canon 24-70 2.8 L II lens and there's a bit of vignetting at the 24mm mark.  Is this to be expected?

I also put a Tokina 12-24 f4 on and at the 12mm mark the image is within a "black frame" and as I zoom out to about 18mm and beyond the black frame goes away.  Is this normal?  Does the adapter act as an extension tube?

For grins i put an Opteka 6.5mm fisheye lens on and got the "circular" look with black edges.  This lens is completely manual but does have a direct ef mount.  On a 7d there is no black edges.  Again, is this a product of the adapter acting as an extension tube?

ef mount 12-24w/ adapter. shot is at 12mmef mount manual 6.5 fisheye

[stevet1]

vgarfr,

I think (think, but don't know for a fact) that when using an adapter, that at the shortest focal lengths of a lens, the lens is picking up the walls of the adapter and you get this vignetting.

Steve Thomas

[Peter]

Turn on lens correction for EF 24-70. Remove all filters and the lens hood.

Tokina 12-24 is for APS-C sensors.

Opteka 6.5 is for APS-C sensors.

[p4pictures]

The Tokina and Opteka lens don't "inform" the camera that they are lenses designed for crop sensors, and therefore the camera uses the full-frame to capture an image. If you select 1.6x crop mode the effects of those lenses will go away as the camera is only looking at the central part of the image that the lenses were designed to cover. Canon EF-S lenses correctly report they are crop lenses to the camera and it automatically selects crop mode.

Here's a post I wrote on my blog a while back about this issue. 

https://www.p4pictures.com/2019/06/eos-r-crop-lenses-aps-c/ 

[ebiggs1]

You would be better off getting an EF or preferably an RF lens in those FL ranges than to try and use lenses made for a crop camera.

[vgrafr]

Thank you to all your replies.  Much appreciated!