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08-16-2010, 05:01 AM   #1
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Sigma 50-150mm vs Pentax 50-135mm

Hi There,

I decided on going for the K-x (maybe olive-green), so now it is time for the lenses!!!

At the wide angle I am going for one of the following two:
  • Sigma 17-70 mm F2.8-4 DC Macro OS HSM, 535g = 350 Euro
  • Tamron SP 17-50 mm F2.8 XR Di II LD ASL IF, 430g = 325 Euro
Tamron is F2.8 over full range, Sigma range is longer.

At the long end I am doubting between the next two:
  • Sigma APO 50-150 mm F2.8 II EX DC HSM, 780g = 575 Euro
  • Pentax DA* 50-135 mm F2.8 ED [IF] SDM, 685g = 800 Euro
Spec wise the Sigma longer, but not by that much, price delta is my biggest concern if IQ is very comparable.
- Any thoughts?


Second question:

If I go for the Tamron 17-50 on the wide angle then I can also consider the mid range tele zoom lens below and some years later go for a 70-200 mm instead of Sigma 50-150 / Pentax 50-135. Should I just go for the Sigma 17-70 or is the Tamron 17-50 significantly better (in 17-50 range of course)?
  • Tamron SP AF 28-75 mm F2.8 XR Di LD Aspherical, 510g = 325 Euro


08-16-2010, 05:06 AM   #2
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The IQ seems good for both tele's: PentaxForums.com Third-Party Lens Review Database - Sigma 50-150mm f/2.8 II EX DC APO HSM Lens Reviews vs Pentax Lens Review Database - SMC Pentax-DA* 50-135mm F2.8 ED [IF] Lens Reviews

Price seems much more comparable than you're indicating, though- have you looked into getting a used copy?

I can't help you with the 17-70mm selection, though, my personal preference is to have a 24-70mm + 70-200mm or 80-200mm.

Adam
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08-16-2010, 05:48 AM   #3
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If you need weather sealing go with the 50-135; if not, go with the 50-150. I owned both the sigma and Tamron 70-200mm lenses. The 50-150 is much lighter and easier to carry around.
08-16-2010, 06:54 AM   #4
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Here's a quick comparison I did last year, albeit on different mounts --> shootout link.


.

08-16-2010, 08:12 AM   #5
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Thanks for your advice/help!!!

QuoteOriginally posted by ivoire Quote
If you need weather sealing go with the 50-135; if not, go with the 50-150. I owned both the sigma and Tamron 70-200mm lenses. The 50-150 is much lighter and easier to carry around.
Yeah, I initial put the 70-200 lenses on my theoretical wish list, but when I visited the shop and looked a the weight, I knew that would not become part of my kick-off set. My kids still be young, I actually have more concerns on the short than on the long side (but with them growing up, it will change over time).

QuoteOriginally posted by jsherman999 Quote
Here's a quick comparison I did last year, albeit on different mounts --> shootout link.
.
Nice comparison!!!
- Hmm you stated the Sigma had slight focus issues at close distances, below 10 feet. 10 = 3 meters, that is pretty close for outside pictures, but not really for inside candid portraits during parties.
- If I add up in-camera lens corrections for Pentax lens, I might go for the 50-135.

If you stand 3 meters away from your lovely boy with this lens then how much do you capture of him with either of these two lenses set at 50 mm?
- Or asked differently if you want to make a full body shot of him standing, how far do you at least (@ 50 mm) have to be away from him?

Oh, a friend adviced me to go for the 17-50 over the 17-70. Having no overlap is a good reason to have a prime at 50 mm!!!
08-16-2010, 08:20 AM   #6
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Overlap

Don't get too hung up on overlapping focal length ranges. I did this when I started a few years ago, and I realize now it's not as important as one first thinks. In other words, if you get the 17-50 and 70-200 you most likely won't be in a situation where you're frantically switching back and forth between lenses because you need 60mm. You'll just move your feet a bit

Get the lenses you want!
08-16-2010, 09:28 AM   #7
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IMO,the color rendering of Pentax lens is a unique feature comparing with Canon and Nikon,however the body of pentax camera have no obvious strength,even more slow AF speed in low light situation,so in general i recommand itself lens for pentax body.
08-16-2010, 04:35 PM   #8
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QuoteOriginally posted by gnaztee Quote
Don't get too hung up on overlapping focal length ranges. I did this when I started a few years ago, and I realize now it's not as important as one first thinks. In other words, if you get the 17-50 and 70-200 you most likely won't be in a situation where you're frantically switching back and forth between lenses because you need 60mm. You'll just move your feet a bit

Get the lenses you want!
Hmm, I guess you are right, but which lenses do I want...

For inside / wide angle I am thinking about on of these three:
- Pentax 16-45 F4 (was incorrect) vs Tamron 17-50 F2.8 vs Sigma 17-70 F2.8-4.0

16 vs 17 might help me more than 70 vs 50 (or even 45)

QuoteOriginally posted by weikle Quote
IMO,the color rendering of Pentax lens is a unique feature comparing with Canon and Nikon,however the body of pentax camera have no obvious strength,even more slow AF speed in low light situation,so in general i recommand itself lens for pentax body.
That is good thinking, but I am only going to buy one camera, so for me the Canon / Nikon will be unique as well.
- I kind of decided for K-x (vs Canon 550D) mainly because In-Camera-Image-Stability and price. But (and at least out side of Japan) Pentax is also a little bit more different then mainstream N/C.
- Lenses from same brand as camera optimizes in camera lens corrections.
- If price delta between Sigma/Tamron lenses vs Pentax is not too big then I indeed should go for Pentax!!!

Guess I have to see what prices they are willing to offer me here in Japan.


Last edited by JoepLX3; 08-16-2010 at 06:03 PM. Reason: Typo on F number for Pentax 16-45
08-16-2010, 05:13 PM   #9
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The pentax da16-45mm is f4. the pentax da*16-50mm is f2.8
08-16-2010, 05:43 PM   #10
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You are right, typo / mis-read...
08-23-2010, 09:27 AM   #11
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Just curious.. How much is the Sigma 50-135 in the marketplace? anyone interested of getting this lens?
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