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Purple Smearing w/K-5IIs

Started Jul 15, 2014 | Discussions thread
Holger Bargen Veteran Member • Posts: 4,911
Re: Purple Smearing w/K-5IIs

Joseph Tainter wrote:

Thanks for your comments, Holger.

Actually, photo one is the Pantheon in Rome. The hole in the dome (the oculus) is a hole--no glass.

I've just never had this kind of problem before.

Joe

Hello Joseph,

thank you for your information. It seems that I do not know enough about architecture. The Pantheon and the Occulus - I just knew it by Name. I should travel more to got better education and cultivation.

I just googled for your church and for some picutres:

https://www.google.de/search?q=pantheon+oculus&source=lnms&tbm=isch&sa=x&ei=n3pfu-cac-je0qxr0ohoag&ved=0cayq_auoaq&biw=1099&bih=479&dpr=1.35&safe=vss

There are many photos showing this effect - and I do not think that it is because of Problems with the cameras but an effect of the light that Comes through the occulus. Maybe the angle of the sun has an effect on the extension of the blue smear of light.

I could imagine that the entire building works a Little like a very big camera obscura with the occulus as the hole - at least the bulding is designed in a very special way. The occulus is lens and aperture at the same time - and these elements may cause braking of light or spliting it up into ist wavelenghts.

I do believe that your photos show an effect that is really there in this building under certain light conditions.

Best regards

Holger

 Holger Bargen's gear list:Holger Bargen's gear list
Pentax K-5 Pentax K-S1 Pentax K-1 Pentax smc DA 55-300mm F4.0-5.8 ED Sigma 70mm F2.8 EX DG Macro +7 more
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