Nikon D200BODY, D70-series, D200KIT 176, Picture Angle and Focal Length, 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 lens- es, 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 D200 is less than that of a 35-mm camera. When calculating the focal length of the lenses for the D200 in 35-mm format, multiply the focal length of the lens by about 1.5:

Option	Approximate focal length (mm) in 35-mm format (modified for picture angle)
35-mm camera	17	20	24	28	35	50	60	85
D200	25.5	30	36	42	52.5	75	90	127.5
35-mm camera	105	135	180	200	300	400	500	600
D200	157.5	202.5	270	300	450	600	750	900

Calculating Picture Angle

The size of the area exposed by a 35-mm camera is 36 × 24 mm. The size of the area exposed by the D200, in contrast, Lens is 23.6 ×15.8 mm, meaning that the diago- nal picture angle of a 35-mm camera is ap- proximately 1.5 times that of the D200.

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

Picture diagonal

Picture size (D200) (23.6 mm × 15.8 mm)

Picture angle (35-mm format)

Picture angle (D200)

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