2008/3/5, C.H.Ling <ch_photo@xxxxxxxxxxxxx>:
>
> I think the trade off on the OM 40/2 is little, it is a full frame with
> weight of 140g and height 25mm. Sigma 30/1.4 is 430g and 24/1.8 is 485g!
Still apples and oranges. Full frame is meaningless for Four Thirds;
the Sigma 30mm f:1,4 is much faster and longer (60mm equivalence). A
fair comparision to the Sigma 30mm would be an OM 60mm f:1,4;
conversely, the Four Thirds equivalent of the OM 40mm would be a Four
Thirds 20mm f:2.
Also, I understand Four Thirds is at a disavantage at wide angulars,
so our fast, compact wide angle prime maybe isn't even possible at
all. That would be a reasonable tradeoff for our compact, light, fast
telephotos.
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