topic Re: My 50mm 1.4 is stuck at 1.4 in EF & RF Lenses

My 50mm 1.4 is stuck at 1.4

ragercker901 — Fri, 02 May 2014 02:31:11 GMT

My canon 50mm 1.4 lens is stuck at f/1.4. The image is identical from 1.4 all the way to f/22. I don't know why this is happening. Any ideas?

Re: My 50mm 1.4 is stuck at 1.4

ScottyP — Fri, 02 May 2014 10:15:04 GMT

Do you mean the camera reads whatever aperture you set? What do you mean the image is the same all the way to f/22? I can see the DOF staying the same if the aperture was frozen, but how is the image not overexposed if the camera thinks the lens is stopped down to f/22? Unless you were shooting Manual, it seems like the camera would be slowing the shutter to give a correct exposure for f/22, which would overexposed the shot with the lens really open to f/1.4.

Re: My 50mm 1.4 is stuck at 1.4

ebiggs1 — Fri, 02 May 2014 12:56:25 GMT

"My canon 50mm 1.4 lens is stuck at f/1.4."

You have it set to Av mode. Switch back to the green square.

Re: My 50mm 1.4 is stuck at 1.4

ScottyP — Fri, 02 May 2014 16:31:24 GMT

Perhaps the OP will elaborate on which mode he is in, and what the camera and lens are doing.

Re: My 50mm 1.4 is stuck at 1.4

ragercker901 — Fri, 02 May 2014 20:41:38 GMT

Sorry for not giving enough info. I first tested the lens on a t3i when I discovered the problem. I then switched to a 5Dmkii to see if it was the camera but I had the same issue. I was in video mode on the t3i and manual on the 5D. It seems like the lens won't move from f/1.4 even thought the cameras read at different f stops.

Re: My 50mm 1.4 is stuck at 1.4

Skirball — Mon, 05 May 2014 16:06:56 GMT

@ebiggs1 wrote:
"My canon 50mm 1.4 lens is stuck at f/1.4."

You have it set to Av mode. Switch back to the green square.

Why would you use the green square if you were trying to get a different aperture? Av is exactly the mode I'd use - or manual.

Re: My 50mm 1.4 is stuck at 1.4

Skirball — Mon, 05 May 2014 16:23:51 GMT

@ragercker901 wrote:
Sorry for not giving enough info. I first tested the lens on a t3i when I discovered the problem. I then switched to a 5Dmkii to see if it was the camera but I had the same issue. I was in video mode on the t3i and manual on the 5D. It seems like the lens won't move from f/1.4 even thought the cameras read at different f stops.

If you begin recording at a different aperture does it look like it's shot at that aperture or still 1.4? If you're on manual and just change the aperture then does the exposure dim? Can you change the aperture for stills? Sorry, don't know much about video, but that's where I'd start my trouble shooting.

Re: My 50mm 1.4 is stuck at 1.4

ebiggs1 — Mon, 05 May 2014 16:25:54 GMT

"Why would you use the green square ..."

By mistake!

Re: My 50mm 1.4 is stuck at 1.4

ragercker901 — Mon, 05 May 2014 17:05:51 GMT

No matter what I do the aperture doesn't change. I've shot with the lens/camera for over 3 years and this is the first time I've had a problem like this.

Re: My 50mm 1.4 is stuck at 1.4

ebiggs1 — Mon, 05 May 2014 19:39:02 GMT

I think yiu have answered your own question, it is broke.