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

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Thread Modes
Focal Length equivalence: DX to FF
Guest
Unregistered
 
#11
05-19-2011, 07:26 AM
[quote name='Brightcolours' timestamp='1305777380' post='8574']

f2.8 to f2 is one stop... f2 to f 1.8 is 1/3rd stop.

For Canon, its f1.8 -> f2.88, a bit over 1 1/3rd.

For Nikon its f1.8 -> f2.7, a bit under 1 1/3rd. Actually... f2.726 for for instance a D300 (1.52x crop), f2.808 for a D3100.

[/quote]

Ok, thought so. I'm calculating from another end:



1 stop - 2x light loss.



1 1/3 stop - ~2.67x



Nikon crop - 1.52^2 = ~2.3x



Canon crop - 1.61^2 = ~2.6x



Both less than 1 1/3 stop. So it's either my calculation is wrong or yours <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/rolleyes.gif' class='bbc_emoticon' alt='Rolleyes' />
Reply
  


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

Forum Jump:


Users browsing this thread:
1 Guest(s)