Not always but sometimes both.
Chuck Norcutt
Winsor Crosby wrote:
> I always though low price was the third party specification edge.
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> Winsor
> Long Beach, California, USA
>
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> On Aug 19, 2006, at 3:41 AM, Chuck Norcutt wrote:
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>>I'm sure you're correct that it's the Sigma lens. The specs are too
>>close to be otherwise. The third party lens producers have got to
>>have
>>some sort of specification edge over the OEM's. Could be that the
>>focal
>>length difference is the "edge" for Sigma. Could also be that Olympus
>>spec'd it that way to avoid more performance fall off at the long end.
>
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