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Opticallimits > Forums > Just Talk > Focal Length equivalence: DX to FF

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Focal Length equivalence: DX to FF
mst Offline
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#4
05-18-2011, 10:50 PM
It's actually more like 1 stop. So, a 85/2 would actually be the "real" equivalent to a 135/2.8 FX lens. Or one could argue that a 85/1.8 behaves more like a 135/2.5.



However, the difference between f/2.8 and f/2.5 (or f/1.8 and f/2 for that matter) is marginal in the real world. So, 1 stop difference as rule of thumb works quite well.



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Messages In This Thread
Focal Length equivalence: DX to FF - by IanCD - 05-18-2011, 09:54 PM
Focal Length equivalence: DX to FF - by mst - 05-18-2011, 10:15 PM
Focal Length equivalence: DX to FF - by IanCD - 05-18-2011, 10:19 PM
Focal Length equivalence: DX to FF - by mst - 05-18-2011, 10:50 PM
Focal Length equivalence: DX to FF - by Guest - 05-18-2011, 11:26 PM
Focal Length equivalence: DX to FF - by Guest - 05-19-2011, 01:20 AM
Focal Length equivalence: DX to FF - by Guest - 05-19-2011, 07:26 AM
Focal Length equivalence: DX to FF - by Guest - 05-19-2011, 08:01 AM

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