Correct diopter formula?
Posted 12 January 2007 - 09:22 AM
D = 100cm / 3.03*r
where r is the radius of the dome in centimeters. However, searching through the archives the following formula often comes up:
D = 100cm / 4*r
Which one is strictly correct? (I have a feeling the first one is correct and the second an approximation but I want to verify that.)
Posted 12 January 2007 - 10:43 AM
Paul Kay,Canon EOS5DII/1DS3 SEACAM c/w S45, 15, 24L, 60/2.8 (+Ext12II) & 100/2.8 Macros - UK/Ireland Seacam Sales -see marinewildlife