02-09-2012, 05:42 PM
[quote name='nandadevieast' timestamp='1328805045' post='15754']
Can someone help me with this?
85 1.4 on a crop camera should have same DOF as 135 F2 on a FF camera....right?
But when we do the math: 85 divided by 1.4 equals to 60 and 135 divided by 2 equals to 67...
I can't understand it....
[/quote]
85*1.5=128mm equiv.
1.4*1.5=f/2.1 equiv.
It isn't an exact equivalent, but for practical uses it's close enough.
Can someone help me with this?
85 1.4 on a crop camera should have same DOF as 135 F2 on a FF camera....right?
But when we do the math: 85 divided by 1.4 equals to 60 and 135 divided by 2 equals to 67...
I can't understand it....
[/quote]
85*1.5=128mm equiv.
1.4*1.5=f/2.1 equiv.
It isn't an exact equivalent, but for practical uses it's close enough.
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