04-19-2013, 09:29 PM
What kind of equivalence? These number acrobatics are just ridiculous - for what reason has the ISO be multiplied? Does the sensor gets less sensitive or more just because of the sensor size?
You're saying
a 50mm becomes a 75mm (not true)
f/1.8 becomes f/2.8
ISO 200 becomes 300
Left numbers FF, right numbers APS-C
That doesn't make any sense
If you go on with that you end up with 500mm, f/18 and 2000 ISO for a normal point and shoot - what kind of equivalence that should be, I just fail to understand. :blink:
You're saying
a 50mm becomes a 75mm (not true)
f/1.8 becomes f/2.8
ISO 200 becomes 300
Left numbers FF, right numbers APS-C
That doesn't make any sense
If you go on with that you end up with 500mm, f/18 and 2000 ISO for a normal point and shoot - what kind of equivalence that should be, I just fail to understand. :blink: