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07-11-2015, 07:19 AM   #1
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Bizzarre vertical lines on a white background?

I've noticed this pop up during my product shoots, and I have no idea what it is. I don't think it's AA-less filter related, but could that be a cause?

In the FA 50 shot, they're horizontal.



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Last edited by Fat Albert; 07-11-2015 at 07:26 AM.
07-11-2015, 07:26 AM   #2
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It's the lens coating. (on the subject lens.)
07-11-2015, 07:29 AM   #3
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QuoteOriginally posted by Parallax Quote
It's the lens coating. (on the subject lens.)
Whoa, really? Is that a defect, or just a property of the lens?
07-11-2015, 07:35 AM   #4
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No, it's not a defect. The lens is curved and you're shooting it at an angle so the some of the incident light is being reflected directly off of the surface and some is being refracted through the coating. The incident light is at an angle as well so, because of the curvature, the amount being reflected and refracted varies across the surface.

07-11-2015, 07:38 AM   #5
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QuoteOriginally posted by Parallax Quote
It's the lens coating. (on the subject lens.)
Don't think so. Assuming the OP is talking about the bands showing on the white background. Those go clear across.

Not sure what that might be, lighting artifact?

Try this:
Shoot the background with nothing on it and see if they are still there.
Shoot the background with nothing on it at various AA simulator settings, including off.
Try moving your lights around to test if the lines move.
Do these show in the RAW files or only the jpg?
Do they correspond to sensor direction? (Was the first shot landscape and the second in portrait orientation)
Try a different background to test if the artifacts are occurring because of the background. It looks shiny, it is acrylic?
07-11-2015, 07:40 AM   #6
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Okay, I don't see any bands on the background; I thought he was referring to the vertical bands on the element of the subject lens.
07-11-2015, 07:42 AM   #7
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QuoteOriginally posted by Parallax Quote
Okay, I don't see any bands on the background; I thought he was referring to the vertical bands on the element of the subject lens.
Not sure myself what he is referring to, I see the refraction lines on the lens itself but I also see a series of perfectly horizontal bands going across the entire image. Horizontal on the first, vertical on the second. They are on the background not the subject.
07-11-2015, 07:45 AM   #8
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QuoteOriginally posted by jatrax Quote
I also see a series of perfectly horizontal bands going across the entire image. Horizontal on the first, vertical on the second. They are on the background not the subject.
Yes, those are the ones. They're quite pronounced, vertically, in the first picture in the following link:

https://www.pentaxforums.com/forums/36-sold-items/298364-sale-sold-smc-pentax...rime-lens.html

07-11-2015, 07:47 AM   #9
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QuoteOriginally posted by jatrax Quote
Shoot the background with nothing on it and see if they are still there.
Shoot the background with nothing on it at various AA simulator settings, including off.
Try moving your lights around to test if the lines move.
Do these show in the RAW files or only the jpg?
Do they correspond to sensor direction? (Was the first shot landscape and the second in portrait orientation)
Try a different background to test if the artifacts are occurring because of the background. It looks shiny, it is acrylic?
I'll be doing this today. Yes, the background panel is acrylic. I'll try rigid foamcore board and a white cotton t-shirt as well, since the foamcore is not a matte finish.
07-11-2015, 07:52 AM   #10
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QuoteOriginally posted by Fat Albert Quote
Yes, the background panel is acrylic.
I'm betting that's the key, right there.
(when I switch monitors I can see the bands)
07-11-2015, 08:03 AM - 1 Like   #11
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QuoteOriginally posted by Parallax Quote
I'm betting that's the key, right there. (when I switch monitors I can see the bands)
Well the good news is we can use those images as a monitor test
07-11-2015, 08:05 AM - 1 Like   #12
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Shooting under fluorescent/CFL lights?
07-11-2015, 08:08 AM   #13
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QuoteOriginally posted by jatrax Quote
Well the good news is we can use those images as a monitor test
Yep. Crappy ViewSonc vs. Dell.
07-11-2015, 08:11 AM   #14
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I see multiple horizontal bands about 1/4 inch part on the top image, But on the bottom image, I see only 2 separate color blocks, divided slightly above the middle on the left side...
07-11-2015, 08:16 AM   #15
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QuoteOriginally posted by Parallax Quote
Yep. Crappy ViewSonc vs. Dell.
LOL, I broke down this spring and replaced my crappy viewsonic with another Dell. Now have a two monitor set, both identical Dells. Painful in the wallet but I'm not regretting it. So much nicer to move from one to the other and have the color stay the same.
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