Originally Posted by
Bob Salomon
It is now called the Linos calculator as Rodenstock Precision Optical was sold to Linos and then Linos was sold to Qioptiq.
The scale is about the width of a dress shirt pocket as the calculator easily fits in one, in its case. One side calculates DOF at several scales for 35mm to 810. So it can also calculate DOF for DSLR FF Cameras. It also calculates the angle of the camera to the subject.
The opposite side calculates Scheimpflug for the same film sizes and also camera angles.
Lastly the calculator will indicate how much exposure correction might be required, depending on the chosen image scale.
The scales are printed in very legible type on the calculators and are easily readable even with my 78 year old eyes with or without my glasses.
While it comes with a detailed instruction sheet the designer, Dr, Schön, numbered each step to do the calculation determination and even his some pictograms to show what each step is doing on the calculator.
Unlike dragging a DSLR out with you to do the DOF the Linos weighs about 2 or 3 ozs and fits flat in your shirt pocket. In all the years that we distributed them we never had one wear out nor had we ever had to replace one. They are extremely durable and easily cleaned off, if necessary. Rodenstock also supplied them OEM for other European companies like Sinar and Linhof without reports of problems, save for people who didn’t read the instruction sheet. But simple, short telephone conversations fixed those problems.
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