LENS FOCAL LENGTH CONVERSIONS
BY FILM FORMAT

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35 mm 6x6 cm 6x7 cm 6x9 cm 6x12 cm 4x5" 5x7" 8x10"
18 33 37 42 53 65 90 130
21 39 43 48 60 75 105 150
22 41 45 52 65 80 110 160
25 46 50 58 75 90 125 180
28 54 60 65 85 105 150 210
32 58 65 75 90 120 160 240
37 67 75 90 105 135 180 270
43 75 85 100 120 150 210 300
43 80 90 100 125 150 210 300
45 80 90 105 135 165 240 330
52 95 105 120 150 180 260 360
60 110 120 135 180 210 300 420
65 120 135 150 195 240 330 480
73 135 150 170 210 260 350 520
85 150 165 180 240 300 400 600
105 190 210 240 300 370 500 740
135 240 270 300 380 470 640 940
Data in the Dark row indicates the diagonal of the film format.
This figure is also technically considered to be the "normal" focal length for that format.

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Copyright © 2002-03 OREGON COAST PHOTOGRAPHERS' ASSOCIATION, Inc. All rights reserved.
Version: 1.0
Revised: October 20, 2002

http://www.thefstop.com/reference/flconv.html Jon Simich (author)