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  1. #21
    David A. Goldfarb's Avatar
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    I thought of a photographic diaphragm, like some people use film to make zone plates, but I wonder if that was a likely way of doing things in 1911. Film was in use, certainly, but I wonder if it had yet become more common for large format photography than dry plates. I've had filmholders dating from that era and earlier, so it was certainly possible.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
    Photography (not as up to date as the flickr site)--http://www.davidagoldfarb.com/photo
    Academic (Slavic and Comparative Literature)--http://www.davidagoldfarb.com

  2. #22
    calceman's Avatar
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    In the article on soft focus lenses (in french) http://www.galerie-photo.com/soft-fo...rait-flou.html
    There's a picture of a fruitbasket shot with tthe imagon. The highlights reproduce more or less the shape of the whole diaphragm with the sieve structure.

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