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rf 800mm f/11 lens puts a "square" on my screen and view finder

Started 1 month ago | Questions thread
Canon_Guy
Canon_Guy Senior Member • Posts: 1,486
Re: Reduced AF ares

Duckman21 wrote:

drsnoopy wrote:

Nothing whatsoever to do with the 1.6x crop. On most bodies the AF area is reduced with this lens (and also the 600/11). The only exception is the R3.

This is well documented online in many places, including by Canon.

OTOH if you choose to apply the 1.6x crop, you will get almost the whole screen area available for AF.

I believe the R6 Mark II and R8 also have a greater AF area with this lens (not completely 100% but at least 85%).

deebatman316 wrote:

I knew that EF lenses had limitations on DSLRs as far as teleconverter and lens combo. But I didn't know that RF lenses and bodies had similar limitations.

For reasons unknown the EF 100-400mm II L does not have this limitation with a 2x teleconverter bringing it to 800mm f11 with the full AF area. Perhaps the actual aperture is brighter than f11 or otherwise some have suggested the whole cr*pple hammer shenanigans.

Perhaps the EF 100-400 + 2x does not suffer from that heavy vignetting as the RF 800

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