35mm 6X4.5 6X6 6X7 6X9 4X5 5X7 8X10 DAV HAV
One of the frequent questions that we get from our customers, both commercial and fine art photographers, is what focal length gives the same view from one format to another. Many photographers specialize in one or two formats and are out of their element when they need to use a larger or smaller system.

To help with this predicament we have created the chart you see to the left. The focal lengths provided are accurate within the formula but may not represent actual manufacturers focal lengths. It should also be noted that this chart is for normal lenses and does not apply to wide angle formula lenses. The angles of view are given in both diagonal and horizontal degrees, some of the horizontal measurements are not available but are generally 12 to 17% less than diagonal. For most applications the horizontal angle of view is used, this gives the angle from left to right. All angles of view are based on 35mm format and are approximate for other formats. Please feel free to print this chart and use as an aid in focal length equivalents.

To utilize this chart simply find the format and focal length you are starting with and then locate the equivalent focal length in the format you will be using. The angle of view will be in the two right hand columns.

13 21 24 25 30 45 60 90 118 ~
15 24 28 30 35 55 75 105 111 ~
17 28 30 35 40 60 80 120 104 ~
18 28 35 35 40 65 85 135 101 ~
20 30 35 40 45 75 100 150 95 84
24 40 45 50 55 85 120 180 84 74
28 45 50 58 60 100 135 200 76 65
35 55 60 75 80 120 180 250 64 54
45 75 80 90 105 150 210 300 52 44
50 80 90 100 120 180 240 360 47 40
55 90 100 120 120 200 250 400 43 36
60 100 105 120 135 210 300 400 40 34
75 120 135 150 180 250 360 500 32 ~
80 135 150 150 180 300 400 600 30 ~
85 135 150 180 200 300 400 600 29 24
90 150 180 180 210 300 400 600 27 ~
100 150 180 200 240 360 500 800 25 ~
105 180 200 210 240 360 500 800 23 19
135 210 250 250 300 500 600 1000 18 15
150 240 300 300 360 600 800 1200 17 ~
180 300 360 360 400 600 800 1200 14 12
200 300 360 400 500 800 1000 1600 12 10
250 400 500 500 600 1000 1200 2000 10 ~
300 500 600 600 800 1000 1600 2000 8 ~
400 600 800 800 1000 1600 ~ ~ 6 ~
500 800 1000 1000 1000 1600 ~ ~ 5 ~
600 1000 1200 1200 1600 2000 ~ ~ 4 ~
800 1200 1600 1600 ~ ~ ~ ~ 3 ~
1000 1600 2000 ~ ~ ~ ~ ~ ~
DAV:
Diagonal Angle of View given nearest degree for 35mm format - will be approximate for other formats.

HAV: Horizontal Angle of View given nearest degree for 35mm format - will be approximate for other formats. Horizontal angle is 12-17% less than diagonal.'

It should also be noted that this chart is for normal formula lenses and does not apply to wide angle formula lenses. Wide angle formula lenses (such as Schneider Super Angulon) will have much greater angle of view.

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this page was last updated Monday, December 05, 2005