I will vouch for the reviewers comments on this lens. I have it and it
is extremely sharp. There is absolutely no vigineting at the corners as
is sometimes the case with superwides, and build quality is excellent.
This is one of Sigma's EX series and shares the same metal barrel and
high grade glass with other lenses in the series. It has Sigma's dual
focus clutch system, where you slide the focusing colour forward or back
(clicks into place) to engage or disengage manual focusing. When
disengaged you can hold the lens by the focusing colour and it does not
rotate as the lens focuses on auto focus.
I like this so much I have traded in my existing EX 28-70 f2.8 to the
new model with the dual focusing feature. My camera shop has phoned to
advise it's in and as soon as I can walk, I will pick it up. ( I bust
my leg up badly and had plates and screws to put it back together).
Cheers, Mike.
Cotty wrote:
>Regarding the Sigma 20 f1.8, while on my deathbed (off work for a couple
>of days with a gastric virus),
>
>>On paper it looks OK, although it's got that dreaded autofocus. Do
>>you know anything more about it than what's on the Sigma web site?
>>There's no mention that I could find wrt size, construction, or
>>whether or not it contains plastic elements.
>>
>
>I rummaged through a pile of APs next to the bed and found a review of
>four Sigmas : 20mm 1.8, 24mm 1.8, 28mm 1.8 macro and 24-70mm 2.8 in the
>22nd Sept 2001 issue. The reviewer rates the 20mm very highly, and wants
>one himself.
>
>20mm 1.8:
>construction - 13 elements in 11 groups
>f/1.8 - f/22
>measured focal length - 20.7mm
>filter size - 82mm
>max diameter - 87.5mm
>max length - 87mm
>weight - 508g
>
>Some quick notes from article: rear focussing, non-rotating front, down
>to 20 cm giving 1:4, aspherical in front and rear groups, elements
>constructed of arsenic and lead-free ecological glass (!), auto focus but
>with Sigma's excellent snap-back manual focus system, can be used that
>way all the time if desired, aperture: 9 blades.
>
>The reviewer says 'the colour is accurate and the contrast punchy' (not
>poochy...) and 'holds shadow and highlight detail very well'. Also 'the
>large rubberised focus ring/grip is comfortable and...feels reassuringly
>substantial'. And 'light dispersion throughout the aperture range is
>excellent, with no vignetting, at least as far as I could tell'.
>
>Full review available via:
>
>http://www.f22.co.uk
>
>or by ordering the back issue from AP (UK phone 020-7907-7777 or email
>[EMAIL PROTECTED]), price to the US inc airmail £3.50.
>
>HTH
>
>Cotty
>
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