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Thread: Focal Length Conversion Chart

  1. #1

    Join Date
    Nov 1998

    Focal Length Conversion Chart

    Is there a focal length conversion chart for 8x10, 4x5, 6x12, 6x9, 6x7 and 35mm formats?

  2. #2
    Robert A. Zeichner's Avatar
    Join Date
    Feb 1999
    Southfield, Michigan

    Focal Length Conversion Chart

    In the 1999 Photographic Artist's Catalog from Calumet Photographic, there is a chart on page 6 that details the angle of view relative to lens focal lengths. I believe this will help. I understand a Java version of the chart appears on the calumet website.

  3. #3

    Join Date
    Mar 1998

    Focal Length Conversion Chart

    Rounded off , I find these factors work well:

    35mm = 1x

    6x7cm = 2x

    6x9cm = 2.25x

    6x12cm = 3x

    4x5 = 3x

    8x10 = 6x

    I based these findings on the similar angle of coverage along the long dimension, not the diagonal.

  4. #4

    Focal Length Conversion Chart

    I believe there's one at

  5. #5

    Join Date
    Apr 1999

    Focal Length Conversion Chart

    I use this simple calculation: focal length x comp. film measure divided with relevant film measure. E.g what would a 135 lens with 4x5 be in 35 mm format? 135 x 36 : 125 = 38,88 mm It can be used as good for height,widht or diagonal comparisons.

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