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06-25-2009, 11:25 PM   #1
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Pentax 16-45 or Sigma 17-70?

I am getting the K7, on another thread someone suggested getting the Pentax 16-50 lens with the camera, but it looks like that will be out of my price range. The 2 kits in my price range that I have seen online are with the Pentax 16-45 or the Sigma 17-70. Any ideas on which one might be the best (I do mostly landscape work to sell)?

06-25-2009, 11:31 PM   #2
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I think the IQ of these lenses are very similar, especially when stopped down to f/8-f/11. For landscape work, the SDM focusing of the 17-70 is basically useless, so if you don't need the extra range it makes sense to go for the 16-45. The 16-45 is actually a very good landscape lens, the distortion at 16mm is much lower than the 16-50.
06-26-2009, 12:35 AM   #3
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Maybe I should just get a prime? I already have a Sigma 10-20, which is a keeper, and I will probably keep my Sigma 18-125 zoom so maybe a Da 40 or Da 70 would round things off nicely?
06-26-2009, 12:51 AM   #4
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I have done a number of landscape panoramics recently with my DA 16-45mm and found that 20mm seemed to be the right setting for the flatlands with F11 or 13 to give me a hyperfocal point that produced a sharp pic from about 2m to infinity. Have you tried your Sigmas? They certainly cover the range unless they do not give you the IQ you need.

06-26-2009, 01:41 AM   #5
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Why not the sigma 18-50 macro, it's a very good lens. I have tried the 17-70 but I liked the 18-50 better, it's such a sharp lens. Maybe the DA 14 could be an alternative for landscape, I recently bought one myself.

Mike
06-26-2009, 03:53 AM   #6
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QuoteOriginally posted by ozlizard Quote
Maybe I should just get a prime? I already have a Sigma 10-20, which is a keeper, and I will probably keep my Sigma 18-125 zoom so maybe a Da 40 or Da 70 would round things off nicely?
I would consider a prime then, yes. Check out this recent thread about using primes for landscapes:
Prime lenses for landscapes? [Page 1]: Pentax SLR Talk Forum: Digital Photography Review

I would also think about something in the 20-30 range, maybe a 28mm or 31mm.
06-26-2009, 05:03 PM   #7
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I'm the one who suggested a 16-50. I'm also looking for alternatives.

though I'll give you some of which I have in mind that you might consider and depends on your budget. 14mm, 21mm, sigma 20 f1.8 (not sure if IQ is at par with the Pentaxes), and the FA 20 (if you could find one).
07-15-2009, 06:03 AM   #8
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Ended up getting the K20 body only and totally happy the camera..it is fantastic. Still debating on the lens issue...had virtually decided on the 16-50 after reading such glowing reports. Just wondering how it will fit in with my UWA 10-20 and 18-125 zoom. I like to shoot wide but am trying to avoid overlap with my exisiting len's but also trying to get a bit more reach that the 10-20 provides. You know when those hills are just toooo far away. I suppose the 18-125 (sigma) could do the job but I have about $1000 AUD to spend and really want a REAL lens (ie Pentax!).

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