6x4.5 format to 35mm equivalent?

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Sirius Glass

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A normal lens for 6x4.5 = sqrt(60^^2+45^^2) = 75mm

Steve
 

Joachim_I

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Just take the ratio of the format diagonales: 70/43 = 1.63. Divide by this number to get the 35mm equilvalent of a 645 lens.

Steve: 645 is actually more like 56mm x 41.5mm. Therefore I used 70mm for the diagonal.
 

Mike1234

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I believe 645 is 42x56mm and the diagonal is 70mm. 135 is 24x36mm with a 43mm diagonal. 70/43 is 1.63 so 1.63x is your multiplier to go from 135 to 645. The inverse of 1.63 is .613 so that's your mulitplier to go from 645 to 135.
 

Christopher Walrath

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I had an 80mm Sekor C for my M645j that was close in FOV to my Rokkor 50mm MD on my XG-M. There ya go. Kinda like converting miles to km's when comparing 35mm to fsd. 1.6 or .62, depending on which way you go.
 
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