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='
' />
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='
' />