OK I must be stupid.

Started Mar 7, 2009 | Discussions thread
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OK I must be stupid.
Mar 7, 2009

In response to one of my threads Andy Westlake made the point that the 50mm f2 is really a 100mm f4 on4/3.

Others talk about how the light gathering ability of a 4/3 lens is less than a full frame lens even if they're both at the same aperature.
I understand that the depth of field changes but I thought that was it.

Can we say that the 90 - 250 f2.8 is still f2.8 even though the focul length equivalent is 180-500mm?

By the way physics was never one of my best subjects so if I am stupid on this one it wouldn't be the first time.
Thanks, Mike
'Never Lose the Wonder!'

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