ChrisM
Well-known member
Imagine getting 200-500 focus speed from your 600 F/4E when mounted via a FTZ on a Z camera.... (possibly exaggerated a bit, but you get the point) that's what happens essentially. You get a different response in AF speed performance vs mounted to a DSLR. The Canon system does not do this, using the EF to RF adapter is like using a native mount lens, AF speed doesn't change between DSLR & MILC bodies.
The FTZ adapter does slow down performance, maybe not (or less) with shorter focal lengths but it definitily did slowdown the 180-400 and 800mm.
I’m shooting the R5 nowadays with some native lenses but allso with the 400 F/4 DO adapted.
The Canon adapter is just a ring which adapts the EF lens to the RF mount without any penalty regarding performance.
When you’re using the cheaper than a FTZ adapter with the control ring you allso get even more functionality.
/edit
Ruley74 was a bit faster LOL
I understand that adapting F-mount lenses to Z mount camera bodies results in slower AF performance compared to AF performance on DSLR bodies like the D500/D850.
I use the 500PF on the D500, but I owned a Z7 for 6 months, adapting the 500PF, and even sold my first D500.
Since then, I sold the Z7 and re-purchased the D500, not only because the AF performance was slower, but also, and mainly, because I found the viewfinder lag unacceptable, and did not like the EVF in bright daylight at all.
I am amazed though that everyone is looking at the FTZ adapter to blame and scold without illustrating in any way why they think the underperfomance is caused by the adapter.
It may well be that Nikon has issues getting the F-mount lenses to perform on a Z body because of a too radical change in AF protocol for the F-mount lenses to be driven properly. That has nothing to do with the physical adapter, but everything with the difference between Z AF and F AF.
On top of that, there are no Z mount native long telephoto lenses yet to make a sensible comparison between adapted telephoto lenses on the current Z6II/Z7II and native telephoto lenses.
I vividly remember a review of the original EOS-R with the Canon 500mm f4II adapted through the EF to R adapter, and the perfomance was just as bad or worse as I hear you describing the 500mm f4 or 600mm f4 on the Z6/Z7 bodies. Shorter lenses were OK, but the 500mm f4 was plain bad on the EOS-R, slow, slow, slow.
Along comes the Canon R5 et voliá, native performance. Did I miss a newly issued EF to R adapter? I don't think so, I am fairly sure it is exactly the same EF adapter that is being used with the R5 as that which gave such poor perfomance on the EOS-R.
Please people, keep it real. Memory is so very short it seems, as if all has been well in Canon land forever. It was not. The R5 and R6 take all the credit, it has nothing to do with the EF to R adapter.