I plan to use a 135mm and 150 mm lens on a 4x5 camera. A friend of mine has a 5 x7 camera -- he plans to use the lenses also. Questions--- What are the hyperfo cal mathematics so that one can plot out a chart for 5x7? I have a hyperfocal d istance chart for the 4x5 format. Can I use my 4x5 chart for 5x7 as well? If no t--- Why? as stated above the same lenses will be used. For those who are not fa miliar with hyperfocal distance-- After the mathematics are done all you do is u se your result chart--Simply set your camera to focus on a given hyperfocal dist ance with lens set on a selected f stop.The shutter should reference metered spe eds for the f stop you select. Your chart calculations will reference you exactl y where the nearest sharp distance is with infinity being sharp as well. This ca n be done for all f stops on your lens or lenses. Now after all the explanation -- who can answer the three questions I asked? Thanks, Tom talltandj@aol.c om
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