I posted a question about fresnel lenses on a crown graphic, and they were an option in the later years. Well I was dissapointed in the performance of the Kodak 127mm Ektar that came with it, so I got out my trusty depth micrometer, and started measuring to see if the fresnel was in the right place.It was, so I started measureing film holders, rollfilm holders, and even a "Polaroid 545 back: The results were scary! My plastic holders averaged .200" from flat into the film, the wood was.191" for same measurment, and I used the same piece of Tri-X film for all of the measuments. The Polaroid 545 was .207" with type 59 film installed. and last but not least was a graplic RH 10 holder that measured .175" to the film (FP-4) installed. The Crown Graphic Camera measued .209" to frosted glass with the fresnel in place, from the back of the camera. I would sure like to know what the specs are for that measurment? A difference of over .030 seems to eleminate shooting at bigger f stops. After almost thirty years making my living as a photographer I took this as agiven, and never bothered to check.
Don Cameron www.doncameron.com
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