Hello,
I've got an Rodenstock Eurygon Anastigmat 1 f4.5/360mm (from 1915).
Vademecum:
"Eurygon f4.5 300, 360, 420mm ... H&D gives 210-600mm, and confirms it is a triplet ... Coverage increases
from 48° to 60° or to 70° as it is stopped down..."
For portraits I did following calculation:
1/b = 1/f - 1/g
b: distance between lens and film, f: focal length, g: distance to subject
tan(alpha/2) = r/b
alpha: angle of view, r: radius of coverage, b: distance between lens and film
- with g = 2m -> b ~ 440mm
- f4.5 -> alpha = 70°
-> diameter of coverage ~ 614mm
-> 30x40cm film format should fit
- f25 -> alpha = 48°
-> diameter of coverage ~ 409mm
-> 9" x 12" film format should fit
Is my estimation correct?
Oliver
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