angle of view of lenses for
2¼″ × 2¼″ (6 cm × 6 cm) photography

 

focal length,
millimeters
side diagonal
30 87° 107°
40 71° 91°
50 59° 78°
60 51° 68°
80 (normal) 39° 54°
120 27° 37°
135 24° 33°
150 22° 30°
180 18° 25°
250 13° 18°
350 13°
500
1000 3.2° 4.6°

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