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Strange color difference, 90mm vs 50mm


tappan

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Hello,

I snapped these M9 photos tonight using a 50mm Summicron collapsible and a 90mm Elmarit. Notice the difference in the lights in the middle, with the 90mm lights being pink or majenta and the 50mm being more normal. I had the 90mm on lens dependent "Manual 90mm 11807" and the 50mm at "50mm 11817" I had a UV filter on the 50mm and no filter on the 90mm. Any thoughts on why the difference?

Thanks,

Mark

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Here are the photos, sorry.

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Mark

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In the 90mm shot there appears to be much less ambient light than in the 50mm shot. Both the sky and body of water appear much darker. However, even with the darker sky and water the buildings and lights are much brighter. This makes me think that the lights are rather overexposed. In the white centers of the lights all colour channels are clipped while in the magenta border only the green one is. Are the funny lights also visible in the original raw image?

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Hi Tappan, was there a few minuets between taking the shots? The 90mm shot looks like it was taken at a later time. This would explain the colour difference.

 

John

 

Hi John, yes. Unfortunately I came upon this too late to set up a tripod. I just snapped a few with the 50mm and then put a beanbag on the roof of my car and snapped about 6 minutes later with the 90mm. The color shift that I am curious about is not the whole frame, just the middle lights. 90mm middle lights are magenta and blow out.

Thanks,

Mark

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