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Point Light Source? (Richard K?)
http://cgi.ebay.com/ws/eBayISAPI.dll...EBWA%3AIT&rd=1 Is it the real thing? Sir Richard, can you help? |
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Point Light Source? (Richard K?)
"jjs" wrote in message ... http://cgi.ebay.com/ws/eBayISAPI.dll...EBWA%3AIT&rd=1 Is it the real thing? Sir Richard, can you help? It appears to be the real thing. Discount the statement about making poor lenses better, I have no idea where the guy got that from other than the point source probably gives the effect of stopping down the lens. Point source lamps are focused on the entrance pupil of the lens so the stop does not control the light intensity. Since the light is very specular at the negative there will be a very significant increase in image contrast, certainly for B&W silver images and maybe even somewhat for dye images. Point sources are used where very high resolution is required such as in printing microfilm. Point sources are also used for making very large prints (but not this small one), and for printing images from microscope or similar scientific films where high resolution or very high edge contrast is desired. They will will bring out any blemishes in the film and also grain so are not the best thing for conventional printing. -- --- Richard Knoppow Los Angeles, CA, USA |
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Point Light Source? (Richard K?)
In article . net,
"Richard Knoppow" wrote: "jjs" wrote in message ... http://cgi.ebay.com/ws/eBayISAPI.dll...EBWA%3AIT&rd=1 Is it the real thing? Sir Richard, can you help? It appears to be the real thing. Discount the statement about making poor lenses better, I have no idea where the guy got that from other than the point source probably gives the effect of stopping down the lens. Point source lamps are focused on the entrance pupil of the lens so the stop does not control the light intensity. Since the light is very specular at the negative there will be a very significant increase in image contrast, certainly for B&W silver images and maybe even somewhat for dye images. Point sources are used where very high resolution is required such as in printing microfilm. Point sources are also used for making very large prints (but not this small one), and for printing images from microscope or similar scientific films where high resolution or very high edge contrast is desired. They will will bring out any blemishes in the film and also grain so are not the best thing for conventional printing. Thank you, Richard. If I may, I've one more question. The seller claims that it can be used with a Focomat II as well as the 35mm-only Focomat. I know the lamp can be made to 'fit', but is his claim reasonable considering the Focomat II handles negatives up to 6x9cm? Would it likely work with 6x9cm? |
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