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05-10-2014, 02:42 PM   #1
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One zoom or two primes

Hello,

question is - Pentax 35mm f2.4 and 50mm f1.8 primes or Sigma 17-50mm F2.8 EX DC HSM Pentax?

I have K-3 with set 18-135mm and I am trying to decide what lens will be my next.

Thank you!

05-10-2014, 02:50 PM   #2
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The primes.
05-10-2014, 03:17 PM   #3
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What do you want to do? Travel? Portraits? Landscape? ...?
05-10-2014, 03:23 PM   #4
hcc
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If you already have the DA18-135mm, you want to complement your lens line-up with primes.

If you want AF lenses, your selection of Pentax 35mm f2.4 and 50mm f1.8 primes is very sound IMHO.

You may get a cheaper and possibly better choice if you are prepared to go MF. The choice of MF vs AF may depend upon what you shoot. There are some great MF lenses for Pentax, and the Pentax backward compatibility opens up a lot of choice with the good 'oldies'.

Hope that the comment may help.

05-10-2014, 04:07 PM   #5
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It's hard to say. The primes will give you better IQ than either the Sigma or your current DA18-135.

But if you want a wider aperture (than your current lens) in a zoom, and you want to cover that whole range, then you may want the Sigma. However, keep in mind that the colors and rendering is different in the Sigma compared to the Pentax lenses (I like the Pentaxes better here). If you do like Sigma rendering, and the wider angles are what attracts you to that lens, then I think you'd be better off getting the Pentax DA50/1.8 (and maybe the DA35/2.4) and then soon getting the Sigma 18-35/1.8. The Sigma 18-35 should be a much better IQ Return on your Investment than the Sigma 17-50/2.8. Why spend $600 on a so-so zoom lens when you could spend $800 on a very good one?


Also realize that the DA35/2.4 gives very good IQ at f/2.4, and the DA50/1.8 at somewhere around f/2.2 to f/2.4 (I haven't owned the latter). In contrast, most Sigma lenses (especially any lens that isn't a very recent design, like the 18-35 is) tend to need a good bit of stopping down for better IQ. So while the primes only give you a fixed Focal Length, their quality shows in their performance near wide-open. So they'll allow you to do things you can't with your current lens. The Sigma needs to be thought of as a lens that needs to be stopped down - perhaps to f/3.5 or f/4. Keep this in mind when comparing (this is also why the brand new design Sigma 18-35/1.8 is a pretty attractive option - you should expect good results at the same apertures as these Pentax primes you're considering).

Last edited by DSims; 05-10-2014 at 04:20 PM.
05-10-2014, 04:08 PM   #6
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QuoteOriginally posted by hcc Quote
If you already have the DA18-135mm, you want to complement your lens line-up with primes.
I think so, too. The 18-135mm is about as good of an all-purpose lens as there is for Pentax, so I would think about going with primes. Of course, you could also think about getting primes which expand upon your 18-135mm and maybe get a DA15mm and maybe a manual focus 300mm f4 or something.
05-10-2014, 04:31 PM   #7
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I'd probably go for the 17-50. But the primes are nice too. Just not as flexible.
05-10-2014, 04:33 PM   #8
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Another vote for the primes.
Very happy with my Da 35 F2.4

05-10-2014, 04:43 PM   #9
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Primes.

But not the ones you mention. Improve the areas where your 18-135 lets you down a tiny bit. Get the 21 f3.2, or the 15 f4, or maybe even the 100 WR macro.

I would choose the 21 myself. But I already have the 18-135, the 21, and a 40 year old 50 f1.4.
05-10-2014, 04:45 PM   #10
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Why are thinking about buying new lenses in the first place?
05-10-2014, 06:24 PM   #11
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As a complement to the 18-135 when travelling I always take a 24mm and a 50mm. Go with the primes. Better image quality and faster useful apertures. The 18-135 is a great all-rounder with WR as a bonus so you need an enhancement to your kit rather than duplication.
05-10-2014, 08:01 PM   #12
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Kref, you've already got your perfectly adequate travel zoom for taking a large number of opportunity shots.

Wouldn't it be great now to also have that pair of primes for a smaller number of prepared shots with even higher keeper percentage?

Last edited by clackers; 05-10-2014 at 09:15 PM.
05-11-2014, 12:28 AM   #13
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Thanks all for answers, I will buy primes :]
05-11-2014, 02:14 AM   #14
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QuoteOriginally posted by kref Quote
Thanks all for answers, I will buy primes :]
Happy to be an enabler for this new addiction.
05-11-2014, 02:27 AM   #15
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I owned the Sigma for a while and it is a fine lens, but two good primes will be a great compliment to your excellent versatile zoom.
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