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10-18-2009, 08:41 AM   #1
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20-40 or 17-70

Sigma DC 17-70 2.8-4.5 or a Sigma DG 20-40 2.8
I am about to buy a new lens in the wide range to replace my kit lens, i think the 20 is a better built lens and will work on full frame in the future when pentax brings out a full frame
which lens would you guys go for, the 20-40 although much older lens and discontinued is a little pricier than the 17-40

10-18-2009, 09:09 AM   #2
axl
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Do you think 20mm will be wide enough for you?
those 3mm on wide end can make dramatic difference.
Otherwise, as you said, one is FF lens, one is not, if that's important for you than it's a clear choice. Though 20-40 is quite a limited range. Considering you have 40/2.8 covered by excellent DA40ltd... have you thought about DA16-45? you can have one cheap (used but in good condition) or if you are after FF lens, have there are other options that could make you happy. FAJ 18-35 and if I remember correctly both Sigma and Tamron were making 17-35/2.8-4.5 or something like that.
Anyway, have a look on your pics (Exposureplot freeware will help a lot) and see how wide are you using your kit lens, start from there...

BR
Peter
10-18-2009, 09:12 AM   #3
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20mm is plenty wide imo. But 20-40mm range is a bit limiting unless you really mostly shoot that range.

For futureproofing I personally would go Sigma 15-30 + Tamron 28-75 (still hunting for one myself. Anyone has one for sale?)
10-18-2009, 10:45 AM   #4
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What about the da 16-50? Wider at the wide range and weather sealed. Don't know the prices on the sigma lenses, but, while pricey, the 16-50 is fast and a great performer.

10-18-2009, 11:14 AM   #5
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QuoteOriginally posted by Andi Lo Quote
20mm is plenty wide imo. But 20-40mm range is a bit limiting unless you really mostly shoot that range.

For futureproofing I personally would go Sigma 15-30 + Tamron 28-75 (still hunting for one myself. Anyone has one for sale?)
RE:20mm
for some things/some people yes, for some no

for many occasions I find even 24 aplenty but ...
If you look at OPs lens list, there is DA40/2.8, Sigma 70-200/2.8 and from one post in "post your photos" section I assume that Taff got hold of FA50/1.4.
Now with those 3 (40, 50, 70-200) lenses in place, I would skip 17-70 for sure. Even 20-40 wouldn't cross my mind. But the 17/18-35 or the Sigma 15-30 named by Andi would be good IMO. The only downside by 15-30 is it's huge front element and built in hood. This prevents any filters and leaves the lens prone flare (from what I gathered while looking into wide angles back in 2007 before buying 10-20).

BR
Peter
10-18-2009, 03:21 PM   #6
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thanks for your replies, for a matter of interest i sold the 40mm so now i have the 50, 70-200, kit 18-50(terrible) and a bunch of takumars. so if i got the 20-40 it seems it would fit in well. my only concern is, is it wide enough? well for everything except landscape, but then i do not have many LS shots I shoot mainly people. gggrrrrrr
thinking toooo much
10-18-2009, 03:37 PM   #7
Ash
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If you're worrying it won't be wide enough, chances are it won't be for your purposes.

What do you think of the kit lens's 18mm? Is that wide enough for you?
If not, there isn't much choice for you other than to go with an ultra wide, or settle for something like a DA 16-45.

If more than wide enough, the 20-40 may suffice. Or get one of the 18-50 f/2.8 offerings...
10-19-2009, 12:54 AM   #8
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why did you sell 40???
anyway, with 50 and 70-200 16-45/4 would seem like a great choice to me, that's unless you're not after faster lens.

BR
Peter

10-19-2009, 04:04 AM   #9
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The 20-40 is an awesome lens and doesn't disapoint. I can say that with my kit the 70-200, 12-24 and 20-40 I'm pretty much well set for what I need at present. The 20-40's got nice bokkeh and is fast for most app's

Having said that the choice is yours
10-20-2009, 07:25 AM   #10
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QuoteOriginally posted by axl Quote
why did you sell 40???
anyway, with 50 and 70-200 16-45/4 would seem like a great choice to me, that's unless you're not after faster lens.

BR
Peter
Sold the 40 as i wanted the 50 1.4 it was a nice lens but i prefer the 50 as a prime
yes i wanted a fast lens for group shots

QuoteOriginally posted by jenko Quote
The 20-40 is an awesome lens and doesn't disapoint. I can say that with my kit the 70-200, 12-24 and 20-40 I'm pretty much well set for what I need at present. The 20-40's got nice bokkeh and is fast for most app's

Having said that the choice is yours
yes the 20-40 has 9 blades which would give a nice bokeh cant wait to test it out tomorrow seeing as i have now bought it
09-12-2011, 12:54 PM   #11
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Hi,

I would love to see some images of the 20-40 at 2.8.
Can you post some?
09-12-2011, 01:09 PM   #12
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20-40, even at f2.8, makes no sense at all to me. I got the 17-70 and love it, it's an excellent lens that constantly surprises me.
09-12-2011, 01:14 PM   #13
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Sure,
I'm looking at the 20-40 2.8 specifically because I'll be using that focal range and aparture almost exclusively for live performance photography. Seemingly the 17-70 isn't so nice zoomed in at 2.8, so I don't see the benefit. I'm assuming that a smaller zoom range will have a better optical quality over the range.

Some samples at 2.8 would be great if you have some.
09-12-2011, 03:01 PM   #14
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I have the 20-40 and it is a dream to work with. It is large, but it's worth it. The build quality is awesome and the fact that I can use it on my P30T is what won me over. If you're looking for some samples, please check out my Flickr, as I have some posted on there, mainly some landscapes, but also some close-ups of some flowers and other objects. That's one thing I love about the lens, is how small the MFD is, compared to my FA50 and my Helios.
09-12-2011, 03:48 PM   #15
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Thanks Brian, much appreciated. If only you shot that gig with the 20-40, I'd have some perfect samples.
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