F4.0 is less than half a stop faster than f4.5. Does it really make a
big difference? Are you using a 1 series or 2 series screen?
Moose
Jeff Keller wrote:
They're quite similar to the 300mm f2.8 but not as common. I'm very
happy with mine. It was recommended by a couple list members - Thanks!
They are bigger than the Zuiko but faster so they are easier to focus. I
use mine more than my similar focal length Zuikos.
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