Graflex.org

[Mark_Davies]

Hi Folk,
On my crown there are two focusing scales and two infinity stops. One of the focusing scales has a "Red" dot on it, and when I set infinity on the other scales, there is only a minor offset on the "red Scales". I assume this is for infared film. Is this correct. With the two sets of infinity stops, one set is 30mm away from the other. As I have a 127 Optar on and one set of stops is at 127mm from film plane, I assume again that the other was for a "97"mm lens. Now that seems to be a wrong assumption. Were there 97mm lenses or was it maybe a 100mm lens that focused at 97mm? Thanks, Mark

[45PSS]

position of the focus scales has no relevance to focal length. If you remove the longer bed half of the scale there will be a number on the back and it can be referenced to a piticular focal length. Another test is to open the bed to 90⁰ , set to infinity as indicated by one or both scales, focus to closer distances and measure from film plane to target and see which scale is correct for the lens. A search with check box "all the terms" selected and "Focus Scales" as the keyword, and alecj in the author box will produce a lot of post about focus scale reference numbers and corresponding focal lengths.
Graflex measured the focal length of each lens and made a scale for it as well as cams. There may be several scales and cams for any given focal length, all will varry slightly.


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