Are you sure? How about the 3x on E-10 which gives 420/2.8? It only has 49mm
filter size.
C.H.Ling
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxxxxxx>
> No matter what film/sensor size it's designed to cover, f-stop is a
> physical ratio. 300mm/2.8 = 107mm. Add something to hold the glass and
> the minimum filter thread is about 112mm. However, in terms of field of
> view, it is equivalent to a 600mm/2.8, a beast we are unlikely to see
> for 35mm/
>
> Moose
>
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