----- Original Message -----
From: "Leandro DUTRA" <leandro.gfc.dutra@xxxxxxxxx>
>
> 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.
>
It is equivalent 80mm F2, not 20mm. When you are talking about 60mm, there
is a 60/1.5 for the Pen, the coverage is larger than 4/3 and weight only
270g all metal, it is equivalent to 120mm F1.5 in 4/3!
> 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.
>
I don't think there is any difficulty to make wide angles for small sensors,
there is already a DZ8mm.
C.H.Ling
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