On 21 Nov 2001, at 11:44, Mike Johnston wrote: > Len P. wrote: > > > Is the film in > > the camera absolutely flat, and how much does that affect > > sharpness? > > Very little, according to exhaustive tests with the only 35mm camera that > does hold the film absolutely flat, the Contax RTS III. But yes, a little. > The Contax 645 also has a vacuum back. The technology comes from satellite > photography, in which 10x10 inch pieces of film are held in place by > sophisticated vacuum mechanisms (my Dad used to be the Director of NASA in > charge of the satellite program, among other things).
I would imagine that although the vacuum back on the RTS III is good for little other than scientific applications it would be of a far greater advantage in the 645 given that there is a far larger unsupported area of film. I recall that Pål experienced many problems related to film flatness with his Pentax 645N. Cheers, Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications.html - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
