on 13/1/02 12:38 am, Gary Russell at [EMAIL PROTECTED] wrote:
> I have been looking (kind of seriously) at Sigma's new 20mm f/1.8 EX. This
> lens, like some of their other newer ones has a "DG" designation. In
> checking the Sigma lens site, I can't seem to find what the DG stands for.
> Does anyone know? And, any comments on this lens by an owner, someone whose
> used one, or just has an opinion about the lens, would also be appreciated.
>
> Gary Russell
Sigma lenses with the DG designation are part of a range designed by the
company for using with digital SLRs. The faster speed is intended to
counteract vignetting problems . That said, UK magazine Amateur Photographer
tested them with film bodies. Their tester was impressed; on the 20mm he
said
"The colour is accurate and contrast is punchy without being too hard. The
lens holds shadow and highlight detail very well, which it should if its
intended for the flatter needs of digital cameras. Light dispersion
throughout the aperture range is excellent, with no vignetting, at least as
far as I could tell. Even at f/1.8 the depth of field is fairly deep,
especially at the upper reaches of the lens's distance scale, and I had no
problem achieving satisfying results in low-light conditions. Where shallow
depth of field is needed, on close up subjects, for example, the nine-blade
iris provides a very attractive blurring."
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