170 years old technology; Petzval #1
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Thread: canon and a Petzval
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9th January 2014, 06:37 PM #1New Member
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canon and a Petzval
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10th January 2014, 02:03 AM #2
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Re: canon and a Petzval
???
I'm sorry, I'm lost. I did learn what a Petzval lens is though - I had to Google it, but I learned a lesson. Not sure how it relates to this painting though.
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10th January 2014, 02:15 AM #3
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Re: canon and a Petzval
What happened to the image you originally posted here?
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10th January 2014, 08:51 AM #4
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Re: canon and a Petzval
Since a Petzval is a so many years old portrait lens, he used it in his Canon and got this image. Yeah, I have to google it too. Amazing old technology...
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10th January 2014, 12:19 PM #5
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Re: canon and a Petzval
When I made my comment, this was NOT the image that was showing.
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10th January 2014, 12:49 PM #6
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Re: canon and a Petzval
The Petzval lens is curious in some ways. They are cropping up in astro circles related to photo telescopes and because of an aberration often called Petzval curvature people assume they are flat field when in fact the true design is far from it.
If some one comes across one of these they might like to give it a go, a more modern design 1893
http://en.wikipedia.org/wiki/Cooke_triplet
It was covered by a patent and people might think that they would have split various elements etc and patented all variations. They didn't but Zeiss and others did and some of the designs are still about today.
John
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