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References

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  1. J. M. Waldram, “A Contouring Density Comparator,” J. Sci.Inst. (British) 13, 352 (1936).
  2. A. Bloch, “Measurement of Nonuniform Brightness by Photographic Photometry,” J. Sci. Inst. (British) 13, 358 (1936).
    [Crossref]

1936 (2)

J. M. Waldram, “A Contouring Density Comparator,” J. Sci.Inst. (British) 13, 352 (1936).

A. Bloch, “Measurement of Nonuniform Brightness by Photographic Photometry,” J. Sci. Inst. (British) 13, 358 (1936).
[Crossref]

Bloch, A.

A. Bloch, “Measurement of Nonuniform Brightness by Photographic Photometry,” J. Sci. Inst. (British) 13, 358 (1936).
[Crossref]

Waldram, J. M.

J. M. Waldram, “A Contouring Density Comparator,” J. Sci.Inst. (British) 13, 352 (1936).

J. Sci. Inst. (British) (1)

A. Bloch, “Measurement of Nonuniform Brightness by Photographic Photometry,” J. Sci. Inst. (British) 13, 358 (1936).
[Crossref]

J. Sci.Inst. (British) (1)

J. M. Waldram, “A Contouring Density Comparator,” J. Sci.Inst. (British) 13, 352 (1936).

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Figures (4)

F. 1
F. 1

The effective aperture of this lens, when viewed from a point on the optic axis, is circular in form.

F. 2
F. 2

This is the same lens as in Fig. 1, but viewed from an angle of 20 degrees and from a slightly greater distance. The effective aperture is the same when viewed from the film side of the lens.

F. 3
F. 3

At 40 degrees from the axis the effective area of lens is nearly zero and this angle marks the extreme width of field possible with this lens.

Equations (3)

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I θ = I 0 cos θ candles ,
E 0 = ( I 0 / F 2 ) ft . c .
E θ = ( I 0 / F 2 ) cos 4 θ ft . c .