Panoramic conversion on FED stereo

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 PANORAMA1.png

http://www.ussrphoto.com/UserContent/3042012_FED PANORAMA2.png

http://www.ussrphoto.com/UserContent/3042012_FED PANORAMA2.png

Wow! how is this possible with 47mm??! Is that enough coverage for such wide negative?

Luiz, thanks for posting!
Vlad.

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

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.

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

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

This same lens was standard on Brooks Plaubel Verywide os 1957
http://www.kenrockwell.com/tech/vw100.htm

And the second model model of 1970
http://www.chinaphotography.com/forum/thread-76104-1-233.html

An exact duplicate of the lused lens can be seen at:
http://www.rockycameras.com/schneider-super-angulon-f8-47mm-wide-angle-lens-14999-7526-p.asp

A comparison made between Super Angulon ans Russar MR2 can be seen on the following picture: both are based on the the same formula:

http://www.ussrphoto.com/UserContent/3042012_russar superangulon.png

http://www.ussrphoto.com/UserContent/3042012_russar superangulon.png

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

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 <b>"The Distortograph"</b> made for movies when persons bedame monsters in a similar way are now used by graphic computation.
Regards
LP

About Distortograph:
Correcting--year 19331:

http://trove.nla.gov.au/ndp/del/article/1138731

A full text with pictures could be seen on the "British Photographic Almanack" of the era.

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

Hello Luiz

<blockquote id="quote"><font size="1" face="MS Trebuchet, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Luiz Paracampo</i>
<br />Distortion is vague term once it means nothing with an adjective.
the distortion could be:
...
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Thanks for this full list of different distorion types and the interesting links.

Best wishes - Guido

An interesting version of the 47mm Super Angulon can be seen in the prototype of the Hasselblad SWC Shift predecessor of the Arc body
see
http://www.marcocavina.com/articoli_fotografici/swc_shift/01_pag.htm

Regards
LP