topic Re: Canon EF 24-70 2.8L Lens - Won't work on apertures other than f/ 2.8 in EF & RF Lenses

Canon EF 24-70 2.8L Lens - Won't work on apertures other than f/ 2.8

BigLannie7 — Tue, 18 Feb 2025 23:18:28 GMT

I was given a Canon EF 24-70 2.8L Lens by a friend to use on my new Canon EOS Rebel T7

It only works on f/ 2.8 and any other aperture it gives me an Error 01, it also shows very dark in the viewfinder and has a black circle in the center of the viewfinder as well. The kit lens that came with this camera works fine. Is the lens broken or am I doing something wrong?

Re: Canon EF 24-70 2.8L Lens - Won't work on apertures other than f/ 2.8

shadowsports — Tue, 18 Feb 2025 23:52:18 GMT

Greetings,

Is this a first generation lens? If so, the lens is broken. (Suffered a failure).

This is a common issue. It's often the flex ribbon cable and/or aperture module that fails. I suggest looking at a used replacement on KEH, adorama or B&H.

Re: Canon EF 24-70 2.8L Lens - Won't work on apertures other than f/ 2.8

BigLannie7 — Wed, 19 Feb 2025 00:02:11 GMT

Thank YOU! It appears to be a very old version of this lens, yes.

Re: Canon EF 24-70 2.8L Lens - Won't work on apertures other than f/ 2.8

BigLannie7 — Wed, 19 Feb 2025 00:22:34 GMT

Sorry when last question, the fact that it works on f 2.8 and no other apertures and is really dark in the viewfinder, probably means its got problems, maybe more than one? It is very old generation of this lens.