Vadim Joy Posted August 18, 2014 Share Posted August 18, 2014 Hello, I purchased an old Birns & Sawyer Range Finder (Model IIIB) on my last trip to Los Angeles. I still can't properly figure out how to use it. It has a table on the side, any help on how to read it? Link to comment Share on other sites More sharing options...
Vadim Joy Posted August 18, 2014 Author Share Posted August 18, 2014 And what does f= stands for? (18.5,25,35,40,50,75,85,100,125,135,150,200) It goes like this: f= Normalfilmu. Breitwand Cinema-scope 2.55 and 2.33 Vista Vision T.V. Riesel -Jkon and Jmaqe-Orth Link to comment Share on other sites More sharing options...
Mark Dunn Posted August 18, 2014 Share Posted August 18, 2014 Despite the name it's not a rengefinder, it's a director's viewfinder. f denotes the lens focal length and the figures are aspect ratios- presumably you know what 'scope is. Breitwand is German for widescreen. The front ring alters the masking for non-anamorphic widescreen- 1.85, 1.75 and 1.66:1 as it says. 'TV' refers to obsolete tube types- I recognise image orthicon and the table is a conversion table for the various aspect ratios and focal lengths. Link to comment Share on other sites More sharing options...
Vadim Joy Posted August 18, 2014 Author Share Posted August 18, 2014 Despite the name it's not a rengefinder, it's a director's viewfinder. f denotes the lens focal length and the figures are aspect ratios- presumably you know what 'scope is. Breitwand is German for widescreen. The front ring alters the masking for non-anamorphic widescreen- 1.85, 1.75 and 1.66:1 as it says. 'TV' refers to obsolete tube types- I recognise image orthicon and the table is a conversion table for the various aspect ratios and focal lengths. Thanks Mark. I still don't get it. Say I set it to 2.33:1, how do i read table? Does it mean that at 2 I'm having 40mm and at 80 I'm having 200mm? Because I seems wrong to me. See pic. Link to comment Share on other sites More sharing options...
Mark Dunn Posted August 18, 2014 Share Posted August 18, 2014 Maybe you set the numbered scale to 2 and that gives you the FoV for a 40mm? The scale is evidently non-linear. Perhaps you can compare it with the FoV on a dslr. Link to comment Share on other sites More sharing options...
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