In response to Pete Andrews the treatises presented by Hansma, Peterson, Luong et al derive the optimum F-Stop for a given focus spread. The formula is simply fs=(Focus spread * 375) ^ 1/2 . For a...
Type: Posts; User: Walter M. Phelps; Keyword(s):
In response to Pete Andrews the treatises presented by Hansma, Peterson, Luong et al derive the optimum F-Stop for a given focus spread. The formula is simply fs=(Focus spread * 375) ^ 1/2 . For a...
The Sinar has a scale on the rail which is calibrated to approximately 1 mark to 1.2 millimeters. Thus, a Sinar spread of 10 equals 12 millimeteers. The scale is not in millimeters because Sinar...
Thanks for the responses. The formula for the focus spread is FS=(1/(1/F-1/VN))-(1/(1/F-1/VF)) from p.l. Andrews, where VN = near distance,VF = far distance, and F = focal length of the lens. This...
Is there a formula for a specified focal length lens which will convert the focus spread of the subject planes, in feet, to the focus spread for the lens, in millimeters?? This would be for a...