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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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 Posted - Apr 30 2012 : 08:56:48 AM
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This is again from the collection Mr. Walter Dubronner. The camera was made from the body of a Russian FED stereocamera. The 47mm Scneider Super-Angulon is fixed on a unit to focus from 3 meter to infinity. The negative size is an astonishing 24x93 mm !!!!
For viewing such long panoramic slides Mr. Dubronner uses special frames (40x110 mm) and a special slide projector. The scanned negatives can be projected with a high quality beamer on a 4 Meter screen For exhibition he uses prints in different formats like 20 x 60 cm and up to 60 cm x200 cm.
Thank Mr. Dubronner very much for providing the details of this camera.
See
http://somakray.blogspot.com.br/2010/01/panoramic-conversion-of-fed.html
http://www.ussrphoto.com/UserContent/3042012_FED PANORAMA1.png
http://www.ussrphoto.com/UserContent/3042012_FED PANORAMA2.png
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Vladislav Kern
Vlad
USA
4272 Posts
My Collection
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Posted - Apr 30 2012 : 09:12:33 AM
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Wow! how is this possible with 47mm??! Is that enough coverage for such wide negative?
Luiz, thanks for posting!
Vlad. |
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Guido Studer
Guido
Switzerland
362 Posts
My Collection
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Posted - Apr 30 2012 : 11:18:05 AM
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Hello Vlad
This must be a lens for medium format (ie. "6x9", 60x90mm) and a focal length of 47mm is a super wide lens on this format. The 47mm lens correspond to a 21mm lens on a "full frame" (24x36mm) camera. So the 20mm finder from KMZ is a good choice.
The angle of view for 24x93mm with a 47mm lens is 29° vertical and 89° horizontal by the way.
Best wishes - Guido
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Vladislav Kern
Vlad
USA
4272 Posts
My Collection
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Posted - Apr 30 2012 : 12:17:55 PM
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Hi Guido,
I see! Thanks for the explanation, but wouldn't a camera like this produce a lot of distortion? I'd be curious to the the resulting picture.
Cheers,
Vlad. |
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Guido Studer
Guido
Switzerland
362 Posts
My Collection
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Posted - Apr 30 2012 : 12:40:14 PM
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Hello Vlad
The degree of distortion depends only of the lens, not of the specific camera. Every (super) wide lens produce some sort of distortion. This is a question of the projection.
Best wishes - Guido
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Posted - Apr 30 2012 : 3:46:28 PM
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Every lens produces a round image! Remember lenses are part of a Sphere ... The rectangular picture shape should be any one once inscript in the circular image area...
Regards
LP |
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Guido Studer
Guido
Switzerland
362 Posts
My Collection
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Posted - Apr 30 2012 : 4:56:10 PM
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Hello Luiz
You are absolutly right on this point. The term "distortion" is used in some different way's in photography. The distortion that I think Vlad had asked for is a normal effect of the spheric projection mostly seen on wide angle pictures. The other distortion is a fault of lens design that make straight lines bent (sorry, I don't know a better word).
Best wishes - Guido
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Posted - Apr 30 2012 : 5:11:53 PM
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Really Guido
Distortion is vague term once it means nothing with an adjective.
the distortion could be:
Barrel distortion once lens gives a perfet square as a barrel (as the name implies)
Pin cushion distortion alo the same in inverse sense
Stigmatism when distortion is preponderant in one direction
Saggital if there is done in tangents of the circle or in the circle but not in the rays of them
Radial if there is done in the rays of the circle but not in the circles themselves
Horizontal or vertical or diagonal when done in a single direction
Aleatory or Randomical whhen it occurrs in an insulated area of the picture
A very interesting lens was made by british opticians around 1938
called "The Distortograph" made for movies when persons bedame monsters in a similar way are now used by graphic computation.
Regards
LP
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Posted - Apr 30 2012 : 5:18:53 PM
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| A full text with pictures could be seen on the "British Photographic Almanack" of the era. |
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Guido Studer
Guido
Switzerland
362 Posts
My Collection
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Posted - Apr 30 2012 : 5:24:51 PM
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Hello Luiz
Yes, the Super-Angulon and the Russar MR-2 (and also the Orion-15) are variants of the symetric double Gauss lens types.
Best wishes - Guido
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Guido Studer
Guido
Switzerland
362 Posts
My Collection
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Posted - Apr 30 2012 : 5:30:24 PM
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Hello Luiz
quote:
Originally posted by Luiz Paracampo
Distortion is vague term once it means nothing with an adjective.
the distortion could be:
...
Thanks for this full list of different distorion types and the interesting links.
Best wishes - Guido
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Luiz Paracampo
Luiz Paracampo
Brazil
2008 Posts
My Collection
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Topic |
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Panoramic conversion on FED stereo
