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

A quick tour of the user guide for the lens doesn't mention it and I can't find anything in the R5's guides about it either.  When I attach the lens, the corners of a square is centered on the screen about 3/4's the full height of the screen.  What is it trying to tell me?  The only guess I have is that is the available focusing area.

Is the camera going into APS-C (1.6x) crop mode by any chance. Or is the AF/ MF switch set to MF.

John Photo wrote:

That would be my guess, also.

To which the AF/ MF switch set to MF or the camera being in APS-C (1.6x) crop mode.

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.

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 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.

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.

Thank you.

I figured it was documented somewhere.  It seems like the user's guide for the lens would be the sensible place.

I'm not complaining.  Just curious what it was.

So far, except for the lens being obviously very dark at f/11, the image quality is very good.

pedz 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.

Thank you.

I figured it was documented somewhere. It seems like the user's guide for the lens would be the sensible place.

I'm not complaining. Just curious what it was.

So far, except for the lens being obviously very dark at f/11, the image quality is very good.

Canon documents the reduced focus areas in the body's suplimental manual.

I heard somewhere that the R6ii also has an expanded area also.

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.

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

pedz wrote:

A quick tour of the user guide for the lens doesn't mention it and I can't find anything in the R5's guides about it either. When I attach the lens, the corners of a square is centered on the screen about 3/4's the full height of the screen. What is it trying to tell me? The only guess I have is that is the available focusing area.

Correct.

Using RF800/f11, this is the size of focusing area with various cameras...

HxW:

R5/R6: 40% x 60%
R7/R10: 60% x 80%
R3: 80% x 80%
R6II: 80% x 80%

https://cam.start.canon/en/H001/supplement_0110.html

CameraCarl wrote:

Yes. The lens will not allow your camera to focus across the entire viewing frame as it might do for many other lenses. The box shows you the limit of the "zone" in which the camera will focus.

We have a winner.

Stig Nygaard wrote:

pedz wrote:

A quick tour of the user guide for the lens doesn't mention it and I can't find anything in the R5's guides about it either. When I attach the lens, the corners of a square is centered on the screen about 3/4's the full height of the screen. What is it trying to tell me? The only guess I have is that is the available focusing area.

Correct.

Using RF800/f11, this is the size of focusing area with various cameras...

HxW:

R5/R6: 40% x 60%
R7/R10: 60% x 80%
R3: 80% x 80%
R6II: 80% x 80%

https://cam.start.canon/en/H001/supplement_0110.html

Can you teach me to fish?

How did you find that document? Is "H001-001" significant somehow or is that just a random title?  I went back to cam.start.canon and tried to find that page and failed.

Stig Nygaard wrote:

pedz wrote:

A quick tour of the user guide for the lens doesn't mention it and I can't find anything in the R5's guides about it either. When I attach the lens, the corners of a square is centered on the screen about 3/4's the full height of the screen. What is it trying to tell me? The only guess I have is that is the available focusing area.

Correct.

Using RF800/f11, this is the size of focusing area with various cameras...

HxW:

R5/R6: 40% x 60%
R7/R10: 60% x 80%
R3: 80% x 80%
R6II: 80% x 80%

https://cam.start.canon/en/H001/supplement_0110.html

How about the R8?

pedz wrote:

Stig Nygaard wrote:

HxW:

R5/R6: 40% x 60%
R7/R10: 60% x 80%
R3: 80% x 80%
R6II: 80% x 80%

https://cam.start.canon/en/H001/supplement_0110.html

Can you teach me to fish?

How did you find that document? Is "H001-001" significant somehow or is that just a random title? I went back to cam.start.canon and tried to find that page and failed.

He. Well, I remembered having posted it before, so I looked in my old activity

If I remember correctly I originally found link from manual or cam.start.canon pages for EOS R3. In the beginning I think the page was comparing R3/R5/R6, but it was later changed to first R3/R7/R10. And then R6II was also added.

And just now I see R8 and R50 also have been added!...

charlyw64 wrote:

thunder storm wrote:

Stig Nygaard wrote:

pedz wrote:

A quick tour of the user guide for the lens doesn't mention it and I can't find anything in the R5's guides about it either. When I attach the lens, the corners of a square is centered on the screen about 3/4's the full height of the screen. What is it trying to tell me? The only guess I have is that is the available focusing area.

Correct.

Using RF800/f11, this is the size of focusing area with various cameras...

HxW:

R5/R6: 40% x 60%
R7/R10: 60% x 80%
R3: 80% x 80%
R6II: 80% x 80%

https://cam.start.canon/en/H001/supplement_0110.html

How about the R8?

As listed in the linked document (same as R6II - they could have well lumped the R8 into the same column as the R6II, I haven't seen any differences between the columns for those two cameras glancing over the list).

If the R8/R50 release is anything like that of the R10/R7, docs like the supplement listed will be updated approx a week before they ship with their info. Around the time when the main manual is available.