What is this glow?

Mark Harris

Mark Harris

Pain in the ass
Hey all, this is my second post, I think, but I lurk regularly and have learned a lot from all of you.

So I just got the DVX100a, and I am playing with it. And I just noticed, sometimes, these weird glows forming around people.

Look at this pic: http://www.desperatecomfort.com/media/images/test-24p/test-24p-CU.jpg

You see that little glow coming off of the right side of her face, almost a double image?

If this is just bad lighting, or due to any other noobie problem, I can deal and continue to experiment with lights and settings, etc.

I'm just posting in case someone says: "Oh, that's the blah-blah problem with the DVX! Everyone knows about that!"

Thanks in advance...
 
It appears to be strobing; due to not allowing pulldown perhaps? Is this glow always there or is this a grab in motion? Is the OIS on or off?
 
Well, it is always there when it is there, if that makes sense. I can bore you all with shots where it is not there.

What do you mean by not allowing pulldown?
 
Looks more like motion blur in progressive scan. Was she moving in that shot? Does it ever happen on a strictly stationary subject?
 
Yeah, I thought it was motion blur too, but it remains on the subject when standing still.

For instance, you can see it on the edge of this couch: http://www.desperatecomfort.com/media/images/test-24p/couch.jpg

Also, FYI, these are the settings used for this stuff:

Detail Level: -4
Vdetail: -4
Detail Coring: 0
Chroma Level: 0
Chroma Phase: 0
Color Temp: 0
Master Ped: 0
A. Iris Level: +2
Gamma: Cinelike_v
Knee: Auto
Matrix: Cine-Like
Skin Tone Detail: ON
VDetail Freq: MID
Progressive: 24P

Also, this effect is more prominent in wider shots.

As I said, if this is motion blur, or something to do with bad settings in 24P, that would make me happy. I'm trying to figure out if there is something wrong with the camera.
 
Unless that couch is moving, it looks like some kind of lens abberation problem, or an offset CCD. If this camera is brand new, I would get it replaced.
 
Is this a frame from a 24p pulled down (60i) timeline? In this case it's normal to get some blurred frames in the pulled down stream when there is motion.
 
I agree with andre
it seems this i a "grabbed" frame made by the "C1C2D" fields.
since you're shooting with DVX100A, try the 24PA to see if this "ghost" is there too.
It seems this is an "other field" image
 
Igor, even 24pA mode in a 2:3:3:2 pull down shows the "mixed field" frame problem, but only once every 5 frames instead of 2 times in 5 frames for the 24p mode. However in a 24pA (reverse pull down) timeline doublefields will be skipped.
 
Thanks for all of the suggestions. I appreciate the input. At this point, this is academic. I will take the camera in to be looked at, AND learn how to light. But I wanted to share a theory with you all anyway.

I was able to replicate this condition in bad light with low light on the subject and bright light off to a side, or behind the subject. Basically, in both of these shots, that is the case. There are floor lamps with photo bulbs BEHIND the subjects in some way, and nothing but ambiant light on the subject.

But I just did a test in my living room - which is flooded with natural light, and I stood opposite the light source - the windows - so that the bulk of the light was on me. And the shot was clear with no ghost.

Does this theory sound completely stupid? I read one other thing on the web, where strong back light caused a focus problem for another user. Again, am I insane, or does this sound valid?
 
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