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01-28-2009, 12:58 AM   #1
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Sigma 20-40mm f2.8 anyone?

Does anyone else have this lens?

I obtained my copy from an Australian auction site and find it very under-rated.

Itís discontinued from Sigma and thereís no replacement for it at all, what pity.

01-28-2009, 01:39 PM   #2
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I'd never heard of it. Oddly, a week or two I thought about posting my idea for a lens *I'd* love but for which I was sure there would be no market - a 2X, f/2.8 zoom that was something like 20-40 or maybe 25-50. My assumption was that such a lens could be made much smaller than something like the 16-50/2.8. But that appears not to be the case with the Sigma...
01-28-2009, 01:55 PM   #3
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I have the Sigma 20-40mm lens. You and I may be the only ones with this lens. I agree that it is underrated. There is a similar lens as well that is underrated, the 15-30mm f3.5-4.5. However, I think this one is better overall. I also like the dual focus feature of this lens because it allows me to use this lens on my SuperProgram.

Edit: here it is in the review data base: https://www.pentaxforums.com/userreviews/showproduct.php?product=316&cat=74
01-28-2009, 02:32 PM   #4
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dont forget this was a film lens, when 20mm was pretty wide.

should not be compared to modern 16-50 lenses, because thats what it essentially was at the time.

01-28-2009, 03:06 PM   #5
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QuoteOriginally posted by Marc Sabatella Quote
My assumption was that such a lens could be made much smaller than something like the 16-50/2.8. But that appears not to be the case with the Sigma...
Correct me if Iím wrong, from what Iíve seen so far, I've gathered this idea that lens with big filter (hence bigger glass) are less likely to go wrong or have better optics.

Besides the light gathering power, prehaps another reason is coz overall itís dearer to make so manufacturers spend more effect in the design and testing.
01-28-2009, 09:12 PM   #6
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QuoteOriginally posted by Luciferase Quote
Correct me if I’m wrong, from what I’ve seen so far, I've gathered this idea that lens with big filter (hence bigger glass) are less likely to go wrong or have better optics.
I suppose there might be some statistical truth to that, but.. DA40. I want that in a zoom :-)

Last edited by Marc Sabatella; 01-30-2009 at 08:47 PM.
01-30-2009, 06:57 PM   #7
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QuoteOriginally posted by Gooshin Quote
dont forget this was a film lens, when 20mm was pretty wide.

should not be compared to modern 16-50 lenses, because thats what it essentially was at the time.
The 20-40mm f2.8 actually carries the DG EX designation which means it was designed for digital and film use in this particular case. The 15-30mm f3.5-4.5 does as well but I'm not sure about its use on film at least at the 15mm end.
01-30-2009, 07:00 PM   #8
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Here is a PopPhoto review of this lens: Lens Test: Sigma 20-40mm f/2.8 EX DG AF - - PopPhotoJanuary 2003

and one for the 15-30mm: Lens Test: Sigma 15–30mm f/3.5–4.5 EX DG AF - - PopPhotoApril 2002


Here is the link to the Sigma site: Sigma - Lenses

Edit: I just traded my Sigma EX DG 20-40mm f2.8 to reknelb for his Sigma 15-30mm which is its wider sibling. I did this due to the redundancy since I have the 21mm ltd, 35mm ltd and the FA 50mm.


Last edited by Blue; 02-06-2009 at 05:08 PM.
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