Practice question · Numerical answer
An enlarging lens of 50 millimetres focal length is set to a magnification of 5. How far, in millimetres, is the lens from the paper?
Hints
- The lens-to-paper distance is the focal length multiplied by the magnification plus one.
- 50 times 6.
Show the answer
300 (answers within ±5 count)
Why
300 millimetres. The same relation puts the negative at 60 mm above the lens, since that distance is the focal length multiplied by one plus the reciprocal of the magnification. Between them these two figures are what decides whether a given enlarger column is tall enough for the print you want.
Practise The Enlarger and the Print
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