Bad vignetting with the 170, Examples inside

D

DM_rider

Veteran
I've been noticing some pretty bad vignetting lately. Any ideas?
No filters, no ois, shot in cine d w/ everything zeroed out, no cc.
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Looked at those on a couple of different screens... I don't see the major problem.
 
I played the footage through my HDTV and I can see it. Maybe I'm over reacting, but it's significant enough that I'm noticing it.
 
The light that day was completely flat and even. So unless there's some reason why the corners are darker, I'd assume it's the camera.

Tried to bring it out some more.
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DM_rider,

This light vignetting is something I see with super-wide lenses of all different brands.

Canon, Lumix/Leica and Sigma lenses have all displayed this when you get to a certain "wideness". Panasonic is on the leading end, I think, when it comes to featuring wide lenses on their cameras.

Do you see it with 100% of your shots, or just when shooting in the snow?

-andrew
 
bikefilms said:
DM_rider,

This light vignetting is something I see with super-wide lenses of all different brands.

Canon, Lumix/Leica and Sigma lenses have all displayed this when you get to a certain "wideness". Panasonic is on the leading end, I think, when it comes to featuring wide lenses on their cameras.

Do you see it with 100% of your shots, or just when shooting in the snow?

-andrew
Click to expand...

mainly when shooting in flat light on snow. You're probably right about it being something that is just inherent in their lenses. If someone else could get some flat light snow shots at full wide, I'd be interested to see the results.
 
Shoot a flat lit grey tone card as a test if you are really concerned and want a true reference of the efect

Anyway. I think its inherent in many wide lenses as well.
 
I know you are working with an HPX170 which has a lens hood that snaps back into place rather working like the HVX200. Did you take your lens hood off and not click it back into place? look at the camera from the front. Is the lens hood on the camera squarely? It is pretty obvious as it will be slightly off.

Just grab it and snap it back into place.
Best,

Jan
 
DM, you should shoot something similar but with the lens hood off the camera and see if you still get the vignette. That way you can determine if it's in the lens or just the hood. If it's the hood then you could modify it but if it's within the lens then...not sure really.

Weenie
 
The lens hood was on correctly when I shot this footage. I'll get some shots without the lens hood today and see if it shows up.
 
DM:

I can barely notice it on the first group. On your second post shot, it is more pronounced. I have not really experienced this with my 170 but I have not shot with it in snow or at the beach yet.

Probably just the way it is since it does have the widest native stock lens of any prosumer camcorder, I agree, I do see that effect on my accessory WA lenses sometimes.

D
 
puredrifting said:
DM:

I can barely notice it on the first group. On your second post shot, it is more pronounced. I have not really experienced this with my 170 but I have not shot with it in snow or at the beach yet.

Probably just the way it is since it does have the widest native stock lens of any prosumer camcorder, I agree, I do see that effect on my accessory WA lenses sometimes.

D
Click to expand...


I'm thinking that it's only going to show up on very bright, flat lit surfaces. I've shot tons of stuff with the lens at full wide and saw nothing. I think the combination of the flat light and bright snow made it show up. I'm going back out this afternoon to shoot in the same conditions so I'll see what I come up with.
 
Usually lenses vignette more when the iris is wide open.

I have a cheap Sigma travel-zoom lens for my DSLR camera that has really bad vignettes with full-open iris at 18mm (widest position, roughly 28mm full frame SLR)
As soon as I use f-stop 8 or higher then it's all gone.

By the way I can also hardly see anything on your first few screenshots. But I think lenses do all vignette by some amount. The real good ones do it a lot less than the cheap ones, but I don't think there is something wrong with your HPX.
 
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