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Shutter adjusting while zooming in

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Sergio Anguiano
Shutter adjusting while zooming in
on Apr 7, 2011 at 5:38:28 pm

Ok so heres whats going on.. I have a new t2i canon dslr and i got it for the movie mode.. I love it but one thing i dont get is when i zoom in the shutter keeps adjusting and you can tell on the video when i zoom in it goes from dark to light exposure even if i have everything in manual mode which i always do cuz i love to be in control.. any help I would apreciate.. Thank you in advance!!


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Daniel Hughes
Re: Shutter adjusting while zooming in
on Apr 11, 2011 at 5:34:07 pm

Hey Serg.

I have noticed this also, I think it's the aperture though, because you can hear the little flicker.

I think it's something either to do with the firmware or the lens you're using.

When I use the 18-55mm kit lens it does this, but I think it's because the maximum aperture varies with the focal length (IE you can get 5.6 maximum at 55mm, and 3.5 maximum at 18mm.)

This must mean there is some sort of mechanical relationship between the aperture and the focal length in this particular lens, which could cause flickery confusion when you zoom!

Best way to avoid this? Avoid zooming! I'm not a fan of zoom shots anyway.

Hope this helps,


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brian klassen
Re: Shutter adjusting while zooming in
on Apr 16, 2011 at 7:41:50 pm

Are you shooting in Manual? I don't believe it should occur if you are.

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