7D video Zooming
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- 13 Responses
- cubanhaze
Hi
I have a variable aperture lens and when i am filming and then zoom in our out with the lens ring I find that this creates some visible light shifts/flicker that are recorded in the movie.
Ive tried locking the aperture but not luck.Should I get a fixed aperture lens or will this be the same ?
Although i found out that when i "twist" the lens and cut the contact with the body a bit out of their socket this does not occur...but I loise the noise reduction from the lense.
thx !
- ok_not_ok0
what lens is this? are you using a manual focus lens with an EOS adaptor?
- erikjonsson0
in getting this on focus shifts.
- pr20
And what do you think the "variable aperture" description really means???????
It means it changes the amount of light as you zoom in or out. Yes, you need a lens with constant aperture. That's what you pay extra $ for.
- scottON0
can't you decide what aperture to use? Or does the body use the maximum aperture by default? It seems like you SHOULD be able to program the exposure to F:8 and let it be. But if Canon hasn't thought of this yet, then you've been elbowed into spending more cash.
I haven't used the 7d so don't attack my know nothingness.
and last I heard, noise reduction doesn't happen in the lens...
in short: YES. Get a fixed aperture lens. Zoom aperture is weak.
- +1 on picking an aperture and sticking with it, instead of letting the camera decidebigtrick
- Tungsten0
As a work around, stop the lense down to 5.6 or whatever your maximum aperture is at the long end of the zoom. You'll lose some speed but at least it won't change as you zoom in and out.
- schneekind0
fixed aperture lens works.
but i dont know if the focus stays where it is when zooming- usually it doesn't. photo lenses are unlike cine lenses - where it does.pr2
- cubanhaze0
I tried locking the exposure to something like f8 with * but I'm still seeing shifts in the image while I zoom in or out. The weird thing is after a few "shifts" it goes back to the look it had before I zoomed since the exposure's the same, so those shifts are useless.
I dont really care if it loses focues on a fixed aperture lens, I am just hoping that theses shifts don't occur with one.
And I meant Image Stabilisation on the lens not noise reduction.
Cheers!
- cubanhaze0
this is what it looks like when I zoom in / out
- ArmandoEstrada0
havent had this problem with 5d, you might want to post at www.cinema5d.com.
- jaylarson0
from what it looks like, the metering is what is at fault here. you are zooming into a darker area and the camera is adjusting the exposure levels on the fly. are you using matrix (evaluative) or spot metering?
- TexJ0
Yeah the Canon T1i does this too. But I'm too lazy to googlesolve it