Focal Length Conversion Chartgreenspun.com : LUSENET : Large format photography : One Thread
Is there a focal length conversion chart for 8x10, 4x5, 6x12, 6x9, 6x7 and 35mm formats?
-- Edie (email@example.com), August 12, 1999
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. www.calumetphoto.com
-- Robert A. Zeichner (firstname.lastname@example.org), August 12, 1999.
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.
-- Ellis Vener (email@example.com), August 12, 1999.
I believe there's one at www.thefstop.com
-- Sean yates (firstname.lastname@example.org), August 12, 1999.
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.
-- Jan Eerala (email@example.com), August 13, 1999.