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I only have the kit lens and the 50mm 1.8 II (with which the aperture feature works flawlessly) but i'll see if i can get my hands on some other lenses.

I can hear the aperture blades moving when this happens:
http://www.youtube.com/watch?v=OBXKK0LdeEg&feature=youtu.be

This happens when the camera is pointed directly at a light source and i think when the aperture value in ml isnt the same as the aperture the lens is actually set to, because this happens with different aperture values.

It doesnt happen everytime but i cant really figure out what sets it off yet.

aah ok that does make sense Do you think there is a way of overriding this?

I tried the autoexec.bin but the aperture still doesnt change in movie mode.
But like i said, i dont have this problem with my EF 50mm 1.8 II lens. Maybe someone could try with other lenses if this info helps you in any way?

I did like you suggested, enabled shutter lock and made sure gradual exposure and fps override were disabled, but still happens.
To further clarify; It's not something that always happens, but when it does my aperture is set to high f stops like around f16 to f22 and it also usually happens when i'm trying to film something light in a dark room. If i try to film my monitor at night for instance. This also only happens with my kit lens, so it could be just something with the lens that is off or something :p

In the movie mode. Yes to exposure override, no to exposure lock

This still only happens with my kitlens by the way

Hi Nanomad,

The issue that kapueblo had with the changing exposurestuff sometimes happens to me as well when i point at a bright light source. But in my case i can see the aperture blades moving. Does this help you any further?

Cheers!

@nanomad,

Gradual exposure wasn't on, so i turned it on but still the aperture wouldn't change.
Any ideas?

Cheers!

http://www.youtube.com/watch?v=tYLd3V08YTg

here's a video in which i try to change the aperture but it doesnt work,

cheers!

I just tried a different lens (canon ef 50mm 1.8 II) and with that lens changing the aperture went well.
So the problem only arises when you using my kit-lens. Could that still be a firmware related thing or is it just my lens?

Hi,
I got a little problem with the movie mode.
I installed magic lantern on 1100D today and right now I'm using the 2012-10-13 nightly build.
So the problem is that i can't change the aperture, well i can change the value but nothing happens.
It's probably something I'm doing wrong but I don't know what.
cheers