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?
09-25-2022 02:40 PM
Im using a canon 80D, i have a 70-200 f/2.8 that i use on the same body and it goes down to f/2.8 but when I switch to the 300mm it only goes to f/5.6
09-25-2022 03:03 PM
I checked Canon's lens hall the aperture range should be from F/2.8-F/32 not F/5.6-F/60. So your saying you can set the minimum aperture to something smaller than F/32. Something is not right if you can set the aperture smaller than F/32.
-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 02:38 PM
Im using a canon 80D and i have a 70-200m f/2.8 that goes down to 2.8 on the same body, there is no extender. I’ve tried both lenses on a different body and yhe same effect. I only shoot in “M”
10-20-2022 07:41 PM
You mentioned the idea of invisible extender. I think that that is exactly what's going on.
I'm shooting 5diii with 300 2.8 ii. Aperture bottoms out at 5.6 - as if it has an extender attached. When I go to autofocus micro adjustments it is registering a 2x attached - there is no 2x attached.
If I attach a 1.4, it registers the 1.4.
I'm open to solutions so that I can get down to 2.8 when neither is attached.
10-21-2022 11:10 AM
"You mentioned the idea of invisible extender."
I have never heard of an invisible tele-con! You should know or see if there is an attachment of some kind on the rear end of the lens. Some off brand tele-cons do not report correct exif data but all Canon extenders do that I know of. You really need to contact KEH.
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