09-23-2022 04:49 PM - edited 09-25-2022 02:42 PM
I just bought a canon 300mm f/2.8 L is USM from KEH and for some reason the aperture goes from f/5.6-f/60.( not to 2.8) Any ideas?
09-23-2022 05:53 PM
Hi OP will the lens work on another body if not. I would recommend that you return the lens to KEH. Also which version of the 300mm F/2.8L do you have Canon has released multiple versions.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT & 600EX II-RT
09-25-2022 02:31 PM
It is a canon 80D and the lens is the Canon 300mm f/2.8 IS USM
09-23-2022 06:33 PM
Can you try the lens on another body? Do other lenses work properly on your camera?
How about manual settings? Set camera dial on M, set exposure time for a few seconds, and run through the range of apertures. Watch the diaphragm to see that it stops down to the smallest apertures.
You have a no-questions-asked-returns warranty if you just bought the lens. Don't hesitate to use it the lens isn't 100% right.
09-23-2022 06:51 PM
Actually I would use Aperture Priority (Av) mode. Then start with wide open F/2.8 all the way to F/22. When using the Depth of Field Preview Button to see if the lens stops down at all apertures.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT & 600EX II-RT
09-25-2022 02:32 PM
My 70-200 f/2.8 stops down to 2.8 and the 300mm on a different body has the same reaction, only 5.6, i only shoot in manual.
09-24-2022 12:49 PM
"... the aperture doesn't go down past f/5.6 it can go up but now down."
You are saying only 3 stops are available? F2.8, f4 and f5.6. You need to get a different camera and try it. If it doesn't work on that body you need to contact KEH.
09-25-2022 02:35 PM
I was using bad terminology, it ranges from f/5.6 - f/60 my 70-200 f/2.8 works at 2.8 but my 300mm f/2.8 doesn’t go down to 2.8, I’ve tried them both on different body's to no avail.
09-24-2022 01:01 PM
@DDsportsPhotos wrote:I just bought a canon 300mm f/2.8 L is USM from KEH and for some reason the aperture doesn't go down past f/5.6 it can go up but now down. Any ideas?
That is a very peculiar sounding issue. It sounds like there is an invisible 2x extender attached to the lens, or the shooting mode you using is somehow restricting the range of aperture settings.
Do you see the same behavior with another lens that is f/2.8, or faster?
What camera body and shooting mode are you using? In M mode, you should have a the entire range of aperture settings available to you. The only restriction would be something defined in your camera settings.
09-24-2022 01:12 PM - edited 09-24-2022 01:24 PM
Actually some camera bodies such as the 5D Mark IV you can set a usable aperture range in the camera's CF settings. I would check this to make sure its not restricting OP's usably aperture range. Before returning the lens if this setting has been inadvertently changed. The CF below is from the 5D Mark IV. If OP can tell us what camera their using. We can tell them if this CF applies to their camera.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT & 600EX II-RT
12/05/2024: New firmware updates are available.
EOS R5 Mark II - Version 1.0.2
09/26/2024: New firmware updates are available.
EOS R6 Mark II - Version 1.5.0
07/01/2024: New firmware updates are available.
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
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