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03-23-2009, 08:50 PM   #1
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If Tamron 17-50mm F2.8 is up against the DA*16-50mm,

whats a cheaper alternative against the DA* 50-135mm if SDM and weathersealing is not required?

other then 70-200 f2.8, doesnt seem to be any in that range other then the antique tamron 28-105mm.

03-23-2009, 08:58 PM   #2
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Amazon.com: Sigma 18-50mm F/2.8 EX DC Lens for Pentax Digital SLR Cameras: Camera & Photo

Last edited by Venturi; 03-23-2009 at 09:00 PM. Reason: better link
03-23-2009, 09:11 PM   #3
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I think he was asking about a cheaper alternative to the 50-135, not another alternative to the 16-50.

And it's a good question. The Tamron 17-50 is very close to the 16-50 in IQ, but there's nothing I can think of that's close to the 50-135 in IQ at a much cheaper price point. There's the Sigma 50-150 2.8, but that's about the same price.

The M 75-150 f/4 is pretty good, but MF. The A 35-105 f/3.5 is also pretty good.


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03-23-2009, 09:21 PM   #4
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the alternative is Sigma 50-150mm but the Pentax 50-135mm is so well priced it doesn't have any competition in this range.

03-23-2009, 09:27 PM   #5
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You're right, "50-135" flew right by me.

I think you're right too, the only 3rd party alternative to the 50-135/2.8 I know of would be the Sigma 50-150/2.8. And at $675-ish not really a bargain by comparison.
03-23-2009, 09:41 PM   #6
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Sigma usually reverse engineers to make the lenses for the various brands.

Is it really beyond Sigma as well as Tamron scope to duplicate a non-sdm and weathersealed version of the 50-135 or come out with their own?

An 18-105 F2.8 if there was one would be a very strong rival to the 16-50mm and 50-135mm.
03-24-2009, 01:05 AM   #7
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QuoteOriginally posted by Reportage Quote
An 18-105 F2.8 if there was one would be a very strong rival to the 16-50mm and 50-135mm.
But would require a backpack in itself. First, you could use it to carry the money you'd need to pay for the lens, then after getting the lens, you could use it to carry the that.

/Jens
03-24-2009, 05:26 AM   #8
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should be somewhat cheaper then 16-50 + 50-135 setup and being bigger should give a "mine is bigger so should be better" libido effect at least on paper.

03-24-2009, 05:40 AM   #9
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could go for a sigma 10-20 f3.5 (when it comes), sigma 24-70 f2.8 and tamron 70-200. f2.8
03-24-2009, 09:17 AM   #10
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QuoteOriginally posted by WerTicus Quote
could go for a sigma 10-20 f3.5 (when it comes), sigma 24-70 f2.8 and tamron 70-200. f2.8
looks a lot like my previous canon setup.
03-24-2009, 01:32 PM   #11
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The Tamron 17-50mm 2.8 IQ is slightly better than the Pentax DA*16-50mm 2.8 and the Sigma 18-50mm 2.8 ,and the quality control on the Pentax lenses has been bad the past few years thats why I went with the Tammy.
My carry around set-up
TAMRON SP 17-50/2.8 Di II
PENTAX DA* 50-135/2.8
SIGMA 150-500 5/6.3 APO,HSM
03-24-2009, 06:07 PM   #12
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QuoteOriginally posted by Reportage Quote
Sigma usually reverse engineers to make the lenses for the various brands.

Is it really beyond Sigma as well as Tamron scope to duplicate a non-sdm and weathersealed version of the 50-135 or come out with their own?

An 18-105 F2.8 if there was one would be a very strong rival to the 16-50mm and 50-135mm.
Since most of Sigma/Tamron's sales come from CaNikon, it doesn't really make sense to come out with a weather-sealed lens, since the cheaper CaNikons don't have weather-sealing. I assume here that the owners of the more expensive models will stick to lenses from their respective camera brands, of course, which may not be the case, I don't know.

About 50-135mm replacements, the forum user hinman made this thread a while back:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/45435-alternat...m-f-2-8-a.html
03-25-2009, 05:32 AM   #13
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reading more on the 50-135`s history, apparently it was from a Tokina-Pentax joint venture.

oddly enough, why didnt Tokina launched its own version?
03-25-2009, 05:43 AM   #14
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How does the bokeh compare between the two?
03-25-2009, 06:00 AM   #15
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QuoteOriginally posted by Reportage Quote
reading more on the 50-135`s history, apparently it was from a Tokina-Pentax joint venture.

oddly enough, why didnt Tokina launched its own version?
But they did: Tokina
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