Bizzarre vertical lines on a white background?

Fat Albert · 07-11-2015, 07:19 AM

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.

Parallax · 07-11-2015, 07:26 AM

It's the lens coating. (on the subject lens.)

Fat Albert · 07-11-2015, 07:29 AM

Originally posted by Parallax

It's the lens coating. (on the subject lens.)

Whoa, really? Is that a defect, or just a property of the lens?

Parallax · 07-11-2015, 07:35 AM

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.

**jatrax** · 07-11-2015, 07:38 AM

Originally posted by Parallax

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?

Parallax · 07-11-2015, 07:40 AM

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.

**jatrax** · 07-11-2015, 07:42 AM

Originally posted by Parallax

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.

Fat Albert · 07-11-2015, 07:45 AM

Originally posted by jatrax

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

Fat Albert · 07-11-2015, 07:47 AM

Originally posted by jatrax

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.

Parallax · 07-11-2015, 07:52 AM

Originally posted by Fat Albert

Yes, the background panel is acrylic.

I'm betting that's the key, right there.
(when I switch monitors I can see the bands)

**jatrax** · 07-11-2015, 08:03 AM - **1 Like**

Originally posted by Parallax

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

vonBaloney · 07-11-2015, 08:05 AM - **1 Like**

Shooting under fluorescent/CFL lights?

Parallax · 07-11-2015, 08:08 AM

Originally posted by jatrax

Well the good news is we can use those images as a monitor test

Yep. Crappy ViewSonc vs. Dell.

SpecialK · 07-11-2015, 08:11 AM

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...

**jatrax** · 07-11-2015, 08:16 AM

Originally posted by Parallax

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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07-11-2015, 07:26 AM	#2
Parallax Senior Moderator Loyal Site Supporter Join Date: Apr 2008 Location: South Dakota Photos: Gallery Posts: 19,332	It's the lens coating. (on the subject lens.)

07-11-2015, 07:29 AM	#3
Fat Albert Veteran Member Join Date: Jul 2013 Posts: 966 Original Poster	Originally posted by Parallax 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
Parallax Senior Moderator Loyal Site Supporter Join Date: Apr 2008 Location: South Dakota Photos: Gallery Posts: 19,332	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
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by Parallax 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
Parallax Senior Moderator Loyal Site Supporter Join Date: Apr 2008 Location: South Dakota Photos: Gallery Posts: 19,332	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
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by Parallax 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
Fat Albert Veteran Member Join Date: Jul 2013 Posts: 966 Original Poster	Originally posted by jatrax 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
Fat Albert Veteran Member Join Date: Jul 2013 Posts: 966 Original Poster	Originally posted by jatrax 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
Parallax Senior Moderator Loyal Site Supporter Join Date: Apr 2008 Location: South Dakota Photos: Gallery Posts: 19,332	Originally posted by Fat Albert 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
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by Parallax 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

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07-11-2015, 08:05 AM - 1 Like	#12
vonBaloney Pentaxian Join Date: Oct 2011 Location: Albuquerque, NM Posts: 6,029	Shooting under fluorescent/CFL lights?

07-11-2015, 08:08 AM	#13
Parallax Senior Moderator Loyal Site Supporter Join Date: Apr 2008 Location: South Dakota Photos: Gallery Posts: 19,332	Originally posted by jatrax 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
SpecialK Pentaxian Join Date: Dec 2006 Location: So California Photos: Gallery Posts: 16,480	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
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,991	Originally posted by Parallax 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.