Nikon D2Hs manual Picture Angle and Focal Length, 234, Calculating Picture Angle

Technical Notes—Optional Accessories

CPU lenses can be identified by the presence of CPU contacts. Type G lenses are marked with a “G” on the lens barrel, type D lenses with a “D.”

CPU lens Type G lens Type D lens

Type G lenses are not equipped with a lens aperture ring. Unlike other CPU lenses, there is no need to lock the aperture ring at the minimum aperture setting (maximum f/-number) when using a type G lens.

Picture Angle and Focal Length

The diagonal picture angle of the D2Hs is less than that of a 35-mm camera. When calculating the focal length of the lenses for the D2Hs in 35-mm for- mat, multiply the focal length of the lens by about 1.5:

	Approximate focal length (mm) in 35-mm format
Picture angle			(modified for picture angle)
35-mm film camera	17	20	24	28	35	50	60	85
D2Hs	25.5	30	36	42	52.5	75	90	127.5
35-mm film camera	105	135	180	200	300	400	500	600
D2Hs	157.5	202.5	270	300	450	600	750	900

Calculating Picture Angle

The size of the area exposed by a 35-mm cam- era is 36 × 24 mm. The size of the area exposed

by the D2Hs, in contrast, is 23.3 × 15.5 mm. Lens As a result, the picture angle of photographs taken with the D2Hs differs from the picture angle for 35-mm cameras, even when the fo- cal length of the lens and the distance to the subject are the same.

Picture size (35-mm format) (36 mm ⋅ 24 mm)

Picture diagonal

Picture size (D2Hs) (23.3 mm ⋅ 15.5 mm)

Picture angle (35-mm format)

Picture angle (D2Hs)

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