Canon 7D iris problem

I almost laughed at you cus the video stoped for buffering right after you said, when I zoom in the fstop changes from f/3.5 to f/5.6.

Although it sorta seems concerning I don't know when I would ever be shooting a video and zoom the way you do in this video. Does it happen if you do a slower zoom?

It just seems odd that it is doing everything opposite of how it should be working, or am i wrong?
 
I was shooting an Office-style shoot today, and that kept happening. Very cumbersome.

Yes, same thing happens when you zoom slowly.

You're right... it opens up when you get closer...
 
I have a variable aperture Canon EF 20-35mm 3.5-4.5 lens, which also does this if I set it to any aperture and zoom in and out. I think it's just the nature of the beast. I'm not sure if they all do this, but it wouldn't surprise me in the least.
 
One way to get around it would be to partially unscrew your lens so the motor that opens the iris doesn't get power, I think they had to do this with the 5d mII before the firmware/ML was out to allow manual settings.

Also, you could invest in a constant aperture lens, my Tamron 17-50 doesn't have this problem.
 
I noticed the problem too...One way around it is to use regular SLR lenses that have the Iris ring on the lens. I know someone who just uses old nikon lenses with a nikon adapter....Anyone know of any good old Canon lenses? I'm going to be looking around for some old lenses but I dont know if the mounts are all the same (I'm fairly new to DSLRs).
 
Definitely the need for a constant aperture lens. It's not a PROBLEM per se - I was surprised when it happened to me the first time, but it makes sense to me. If you have a constant aperture lens or an older lens like talked about above, you'll be fine.

Kegan
 
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