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11-06-2013, 03:39 PM - 1 Like   #1
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Sigma 18-35 1.8 art vs HD DA 20-40mm F2.8 - 4 Limited DC WR

I wanted to start this thread as pentax has just made official the release of the new HD PENTAX DA 20-40mm F2.8 - 4 Limited DC WR. The MSRP is $1000!

I feel that at this price tag, for me, sounds too expensive. Considering that the sigma is $799.

Yes the pentax one most likely have superb image quality. However the sigma is no slouch. Everybody that has reviewed this lens pretty much kneels down to it.
Yes the pentax is WR
Yes the pentax is smaller/lighter. Based on what you want, this might be deal breaker
Yes the Pentax is much slower. At 35mm you should expect this lens to go to f4.
Yes the sigma only goes to 35mm while the pentax goes to 40mm. But the sigma goes down to 18mm while the pentax only goes to 20. all in all, there is a difference of 3mm in the range of the lenses (for me, i feel is not that much)

Given that is variable aperture, limited focal length (20-40). what is the market for this lens? I assume that a 17-50 2.8 will be way much more versatile than this for half the price! (tamrom's are $500 in amazon)
I know the sigma is "only" 18-35mm but at least you get f1.8!! even you use it or not, you know that stopping down at least to f.2 gives you sharper images...

anyway, im just trying to understand, why would you buy this lens and not the Sigma. it seem to me that the extra weight of the sigma pays off with with 2+ stops (f4 to f1.8) when on the long end.

what will you buy? and why?

11-06-2013, 03:44 PM   #2
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The Sigma, hands down. It will be MUCH more useful for my convention photography.
11-06-2013, 04:10 PM   #3
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I vote for the Sigma as well. For $1k and F2.8-F4, the pentax would need to be a serious performer to even be considered.
11-06-2013, 04:35 PM   #4
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I'm getting the Sigma 17-50/2.8 ($560) instead of the ltd. zoom.

11-06-2013, 05:19 PM   #5
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QuoteOriginally posted by jrcastillo Quote
snip...

anyway, im just trying to understand, why would you buy this lens and not the Sigma. it seem to me that the extra weight of the sigma pays off with with 2+ stops (f4 to f1.8) when on the long end.

what will you buy? and why?
Not saying that I would buy either of them. But, I don't think you can necessarily say getting extra 2+ stops makes up for the weight difference. For some people you want one or the other. At 810g vs 283g the difference is over 0.5kg. This is fairly significant for a hiker for example.
11-06-2013, 05:20 PM   #6
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1. Sigma 17-50 f2.8
2. Sigma 18-35 f1.8
3. Sigma 17-70 "C" f2.8-4

I wouldn't even consider the Pentax 20-40mm considering these three Sigma's have a good reputation and are cheaper. WR is not very important to me.
11-06-2013, 05:52 PM   #7
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QuoteOriginally posted by RyanS Quote
1. Sigma 17-50 f2.8
2. Sigma 18-35 f1.8
3. Sigma 17-70 "C" f2.8-4

I wouldn't even consider the Pentax 20-40mm considering these three Sigma's have a good reputation and are cheaper. WR is not very important to me.
Are you a Sigma rep?... not that there's anything wrong with that.

For your first choice, the Tamron 17-50 2.8 is probably best in class.
I don't like the Sigma 17-70. You can do so much better at 70. Look at the Sigma 70 macro, and you'll see what 70 can be.

Last edited by normhead; 11-06-2013 at 06:01 PM.
11-06-2013, 05:59 PM   #8
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QuoteOriginally posted by normhead Quote
Are you a Sigma rep?... not that there's anything wrong with that.
Nope. Just the zooms I'd spend my money on. If Pentax didn't have the SDM issue with the 16-50 then that would be on the list too.

11-06-2013, 06:08 PM   #9
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How much will you be thinking of the 200 dollar saving after spending a whole day traipsing around a city or place of interest? After 3 or 4 hrs you'll be feeling every gram of difference between the Sigma and Limited. Think of somewhere like Rome, 40 degC, thieves prowling around :P, who will they spot first? the person with the Sigma mounted or the person with the more discrete Limited?
Still they will both have their fans and detractors.
11-06-2013, 06:13 PM   #10
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QuoteOriginally posted by robbiec Quote
How much will you be thinking of the 200 dollar saving after spending a whole day traipsing around a city or place of interest? After 3 or 4 hrs you'll be feeling every gram of difference between the Sigma and Limited. Think of somewhere like Rome, 40 degC, thieves prowling around :P, who will they spot first? the person with the Sigma mounted or the person with the more discrete Limited?
Still they will both have their fans and detractors.

Every Gram? Seriously?

I'm very limited in what I can physically these days, And I am concerned about weight. But not THAT concerned.
11-06-2013, 06:27 PM   #11
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On balance the Sigma is more appealing it has more at the wide end and it's much faster. Def not a small lens though has to be said.
The price is not unreasonable IMO

But the 17-50mm's are the main competitors to a limited 20-40mm f2.8-f4
Maybe the optics will be great who knows..you've still lost a stop in speed which might matter to some
11-06-2013, 06:35 PM - 1 Like   #12
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QuoteOriginally posted by jrcastillo Quote
I wanted to start this thread as pentax has just made official the release of the new HD PENTAX DA 20-40mm F2.8 - 4 Limited DC WR. The MSRP is $1000!

I feel that at this price tag, for me, sounds too expensive. Considering that the sigma is $799.

Yes the pentax one most likely have superb image quality. However the sigma is no slouch. Everybody that has reviewed this lens pretty much kneels down to it.
Yes the pentax is WR
Yes the pentax is smaller/lighter. Based on what you want, this might be deal breaker
Yes the Pentax is much slower. At 35mm you should expect this lens to go to f4.
Yes the sigma only goes to 35mm while the pentax goes to 40mm. But the sigma goes down to 18mm while the pentax only goes to 20. all in all, there is a difference of 3mm in the range of the lenses (for me, i feel is not that much)

Given that is variable aperture, limited focal length (20-40). what is the market for this lens? I assume that a 17-50 2.8 will be way much more versatile than this for half the price! (tamrom's are $500 in amazon)
I know the sigma is "only" 18-35mm but at least you get f1.8!! even you use it or not, you know that stopping down at least to f.2 gives you sharper images...

anyway, im just trying to understand, why would you buy this lens and not the Sigma. it seem to me that the extra weight of the sigma pays off with with 2+ stops (f4 to f1.8) when on the long end.

what will you buy? and why?
The Sigma is high-performance and FAST but big. The Pentax is high-performance and TINY but slow. Apples and oranges IMO

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11-06-2013, 06:56 PM - 1 Like   #13
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11-06-2013, 07:06 PM   #14
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QuoteOriginally posted by Mr Spocko Quote
But the 17-50mm's are the main competitors to a limited 20-40mm f2.8-f4
Thats what i was saying. The tamrom 17-50 (for example) is faster and has wider range of FL. yes is a bit larger but is less than half the price for only an extra 5 ounces in weight (10.3oz Vs 15.5oz on the tamrom)!!!!, That's why is just hard for me to think who can justify buying this new 20-40mm. That's why I asked around to see if there is actually anybody that see and actual market for this

I think what I am trying to say is that this new lens by pentax is not the fastest, might not be the sharpest, it has a limiting FL range, is "small and light" but then is $1000... what would we pay the premium for?
11-06-2013, 07:12 PM   #15
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QuoteOriginally posted by jrcastillo Quote
Thats what i was saying. The tamrom 17-50 (for example) is faster and has wider range of FL. yes is a bit larger but is less than half the price for only an extra 5 ounces in weight (10.3oz Vs 15.5oz on the tamrom)!!!!, That's why is just hard for me to think who can justify buying this new 20-40mm. That's why I asked around to see if there is actually anybody that see and actual market for this

I think what I am trying to say is that this new lens by pentax is not the fastest, might not be the sharpest, it has a limiting FL range, is "small and light" but then is $1000... what would we pay the premium for?
I will buy it when they discount it to $700-800. Just saying.
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