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Introduce myself and seek advice
Nov 6, 2018 07:25:16   #
JasonLiu
 
I have been a reader of this forum for a long time and find it interesting and helpful. Recently I took a Rocky Mountaineer trip in Canada. I took the attached photos in the train. It just stopped raining and there was no rainbow in the sky. The window of the train is clear, no waterdrops on the train window. I had a CPL lens on the camera (an Olympic Em1 M2+12-100 f/4 pro lens), I adjust the CPL to eliminate the reflections of lights/people inside the train to be shown on the photo. You can't see the rainbow color with your eyes, they were just shown in the photo image and only on water surface, not the entire photo. I don't know why they were shown in the photo. Any advise. Thanks in advance.





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Nov 6, 2018 10:35:20   #
MT Shooter Loc: Montana
 
Its caused by the combination of your CPL and the laminated safety glass you were shooting through. No CPL and using a rubber lens hood up against the glass would have been a better choice.

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Nov 6, 2018 10:55:47   #
DirtFarmer Loc: Escaped from the NYC area, back to MA
 
Some plastics will rotate polarization when placed under stress. The rotation can be wavelength dependent. Safety glass has a plastic layer between 2 glass layers. The stress can be built into the safety glass during manufacturing or could be due to the mounting or even due to pressing on the glass with your camera.

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Nov 6, 2018 11:03:49   #
Cdouthitt Loc: Traverse City, MI
 
MT Shooter is spot on with the issue.

It should have been visible in the EVF or on the back of the screen while shooting. Did you miss it while shooting?

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Nov 6, 2018 21:00:40   #
JasonLiu
 
Thanks.

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Nov 7, 2018 13:18:10   #
wdross Loc: Castle Rock, Colorado
 
JasonLiu wrote:
I have been a reader of this forum for a long time and find it interesting and helpful. Recently I took a Rocky Mountaineer trip in Canada. I took the attached photos in the train. It just stopped raining and there was no rainbow in the sky. The window of the train is clear, no waterdrops on the train window. I had a CPL lens on the camera (an Olympic Em1 M2+12-100 f/4 pro lens), I adjust the CPL to eliminate the reflections of lights/people inside the train to be shown on the photo. You can't see the rainbow color with your eyes, they were just shown in the photo image and only on water surface, not the entire photo. I don't know why they were shown in the photo. Any advise. Thanks in advance.
I have been a reader of this forum for a long time... (show quote)

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Nov 7, 2018 13:57:10   #
PHRubin Loc: Nashville TN USA
 
MT Shooter wrote:
Its caused by the combination of your CPL and the laminated safety glass you were shooting through. No CPL and using a rubber lens hood up against the glass would have been a better choice.


Welcome to UHH!

MT is right on!

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Nov 7, 2018 16:21:56   #
wdross Loc: Castle Rock, Colorado
 
JasonLiu wrote:
I have been a reader of this forum for a long time and find it interesting and helpful. Recently I took a Rocky Mountaineer trip in Canada. I took the attached photos in the train. It just stopped raining and there was no rainbow in the sky. The window of the train is clear, no waterdrops on the train window. I had a CPL lens on the camera (an Olympic Em1 M2+12-100 f/4 pro lens), I adjust the CPL to eliminate the reflections of lights/people inside the train to be shown on the photo. You can't see the rainbow color with your eyes, they were just shown in the photo image and only on water surface, not the entire photo. I don't know why they were shown in the photo. Any advise. Thanks in advance.
I have been a reader of this forum for a long time... (show quote)


MT shooter is correct. The phenomena is termed birefringence. It is the same "rainbow" that one sees from a very thin layer of oil on water.

Sorry that my first comment "disappeared".

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Nov 7, 2018 16:34:53   #
SharpShooter Loc: NorCal
 
JasonLiu wrote:
I have been a reader of this forum for a long time and find it interesting and helpful. Recently I took a Rocky Mountaineer trip in Canada. I took the attached photos in the train. It just stopped raining and there was no rainbow in the sky. The window of the train is clear, no waterdrops on the train window. I had a CPL lens on the camera (an Olympic Em1 M2+12-100 f/4 pro lens), I adjust the CPL to eliminate the reflections of lights/people inside the train to be shown on the photo. You can't see the rainbow color with your eyes, they were just shown in the photo image and only on water surface, not the entire photo. I don't know why they were shown in the photo. Any advise. Thanks in advance.
I have been a reader of this forum for a long time... (show quote)


Jason, welcome to the Hog!!!
Hey, looks to me like a killer whale just feasted on a fat seal and now there’s an oil slick!!! LoL
Hey, just a guess!!!
Again, welcome!!!
SS

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