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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Epic Canon EF Iris Lock

Andrew Walker

Andrew Walker

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I was just thinking about this and I'm hoping RED has already thought about it. But it would be nice to have the option in stills mode to have the iris locked, instead of it going to the f-stop that you have on the camera. This is the way Canon and all the other DSLRs out there deal with electronic lenses and it sucks. It mainly sucks for timelapse and that's what made me think about this. With an iris lock option, if it isn't already like this, it would make flicker in timelapse caused for iris inconsistency a thing of the past. Its really only a problem at high f-stops but still I would like to see the option and it seems like something pretty easy to write into a firmware update to the camera. Hopefully its already there when I get my Epic :thumbsup:
 
Do you mean that because the DSLRs take a new picture each time, the iris closes and reopens for every frame, and so fluctuates slightly between consecutive stills - due to exposure measurement and iris actuator motor position tolerances?
 
This is huge for stopmotion. Most people use Canon cameras with full manual Nikon lenses so the flicker is never an issue. With the amount of lenses you will be able to use this shouldn't be hard to deal with. It's always going to be better with a full manual lens though.
 
Their reasoning is that they want to give the autofocus the biggest aperture to work with which is in itself not a bad thing. The problem is that this even happens with live view in manual focus mode with the aperture preview button pressed.
 
Matthias Hutter said:
Their reasoning is that they want to give the autofocus the biggest aperture to work with which is in itself not a bad thing. The problem is that this even happens with live view in manual focus mode with the aperture preview button pressed.
Click to expand...

It can be a bad thing - with very large aperture lenses, focus can change significantly when stopping down from 1.2 to 4.

It should at the very least be an option to have it work like a manual lens (always stopped).
 
ericyoung said:
Well, not really, if the camera was designed primarily for stills.
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Exactly!

I have not found flicker occurring in full manual mode (canon glass) but it does occur in the program modes (P,TV,AV). So I think the problem is more to do with subtle variations in exposure when using program modes. (esp in P mode where the shutter speed and aperture can each vary by 1/3+ stop). It is possible, if a little labourious, to remove flicker in post by adjusting the levels of the offending frames. (and I think someone wrote a plug-in to do just that automatically)

JohnF
 
This is also the reason why I use Zeiss ZF lenses on my 5D2 for timelapse. But some lenses that are Canon EF I have to use. Like the 24mm 1.4L, which will flicker if it's stopped down far enough. So again it would just be a nice option to have in Epic.
 
Well I hope RED has this figured out because I would like to use all my lenses and not worry about flicker while shooting timelapse. Right now if I have to stop my lens all the way down I usually go with one of my Zeiss ZF lenses because they are all manual and there's no chance of flicker. Just have to see what RED comes up with but I'm almost certain that they have something already figured out for this.
 
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