terry_lorch1 Posted January 11, 1998 Share Posted January 11, 1998 I want to know the circle of confusion for 2 lenses: <p> Speed Graphic 4x5 Graflex Optar 203mm f/7.5 Speed Graphic 4x4 Graflex Optar 135mm f/4.5 <p> These would allow me to calculate hyperfocal and depth of field charts. <p> Any help would be appreciated. <p> Terry LorchTerr725@aol.com Link to comment Share on other sites More sharing options...
rob_rothman1 Posted January 12, 1998 Share Posted January 12, 1998 The circle of confusion is not a property of the lens itself. Rather, it is a measure of how critical you, the photographer, want to be. Hyperfocal distance (and, by extension, depth of field) will vary depending on how large a circle of confusion you consider to be "acceptable". The less critical you are (or the smaller the print size you want to make), the larger a circle of confusion you can use in doing your DOF calculations. <p> Kodak does put out a publication on optical formulas which includes the "standard" COC size for different film formats. (Sorry, I don't remember what they are). However, there is no such thing as the "correct" circle of confusion for a given lens--basically, its whatever you can live with. Link to comment Share on other sites More sharing options...
rob_rielly Posted January 12, 1998 Share Posted January 12, 1998 Graflex put out a reference card to carry in your equipment case that lists the circle of confusion for the Graflex 135 Optar as 0.003". The card also has a depth of field reference for various distances at each f stop. I'd be more than happy to scan it and e-mail it to you, if that will be of use. Regards, Rob Rielly Link to comment Share on other sites More sharing options...
peter_cane2 Posted October 22, 2006 Share Posted October 22, 2006 Seems like the CoC of the 135mm 4.7 graflex should be .03 not .003. Does anyone know? thanks Peter Link to comment Share on other sites More sharing options...
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