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04-01-2011, 02:13 PM   #1
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lens to buy 17-50 range 500-600$

Pentax SMCP-DA 17-70mm f/4 AL (IF) SDM





Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF]

Pentax SMCP-DA 16-45mm f/4.0 ED AL Autofocus



or some other option that im missing ?


i do like 17-70 nice range and constant aperture but tamrons f2.8 liltle quicker lens so, not sure whixch one to for, any one who had and two of those to compare ?

04-01-2011, 02:26 PM   #2
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There are a few similar lenses from Sigma, but the Tamron is probably your best bet.

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04-01-2011, 02:29 PM   #3
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You are missing the Sigma option they also got a 17-50 f2.8 in that price range.
If i were you i would go for the Tammy, it's got a good rep (i own the 28-75 f2,8 and i absolutely love it...that can be a good range if you own a WA lense too.).
04-01-2011, 02:35 PM   #4
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Sigma makes a 17-70mm. In fact, 2 different versions.....but neither is constant 2.8 like the Tammy 17-50. If you're lucky enough to find a used one, Sigma does have a 24-60mm constant 2.8 that is pretty decent. But again, not new.

Pentax offers the 16-50mm, constant 2.8 but on the down side, its SDM. That may or may not be an issue....lots of opinions on SDM, and I won't go further but to add the 16-50mm is a really nice piece of glass.

Good luck with your choice,

04-01-2011, 02:35 PM   #5
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There are some used Pentax 16-50 SDM floating around on the Marketplace for $500.
04-01-2011, 03:16 PM   #6
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I'd vote for the Tamron. I've owned the Sigma macro version (18-50 f2.8), the DA*16-50mm (3 times but that's a whole other rant) and now the Tamron. The Tamron is just as sharp as the Pentax, renders a very good image (colour tones) is a good AF performer (much better than the DA*) and has a lot less barrel distortion than the DA*.

The last issue drove me nuts about the DA*. Shoot below 20mm and a horizon was clearly curved. It could be corrected in PP but you loose some of the size of the image and the distortion isn't completely uniform.

For half the price, the Tamron is a much better lens than the Pentax. The Sigma is good but not quite as sharp wide open.

Last edited by Peter Zack; 04-01-2011 at 03:29 PM.
04-01-2011, 03:23 PM   #7
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I just noticed you were looking at the DA16-45mm. With that lens, it's a tough choice. I've owned this lens (2 of them actually). Never any issues with either and it's a great performer. It's only downfall might be the one stop difference if you want to shoot limited DOF images. With the ISO performance of today's cameras, F4 isn't much of an issue. But F2.8 might have some attraction because you can shoot with a thinner DOF. Otherwise it's a toss up between it and the Tamron. The extra 5mm might make some difference once in awhile but not much.
04-01-2011, 03:26 PM   #8
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QuoteOriginally posted by dasuhu Quote
There are some used Pentax 16-50 SDM floating around on the Marketplace for $500.
Over a year ago I bought a used copy of this lens for about $600. The more I use it, the more I like it. It is now responsible for 70% of my photos.

04-01-2011, 03:58 PM   #9
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what about 17-70 f4 ? got great reviews etc
04-01-2011, 04:24 PM   #10
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QuoteOriginally posted by Peter Zack Quote
But F2.8 might have some attraction because you can shoot with a thinner DOF
And it is faster too...it'll let you shoot in dimmer light situations than with the 16-45...with today's iso f4 is fine but f2,8 can be very helpfull with some night shots.
04-01-2011, 05:02 PM   #11
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QuoteOriginally posted by fafo13 Quote
Pentax SMCP-DA 17-70mm f/4 AL (IF) SDM





Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF]

Pentax SMCP-DA 16-45mm f/4.0 ED AL Autofocus



or some other option that im missing ?


i do like 17-70 nice range and constant aperture but tamrons f2.8 liltle quicker lens so, not sure whixch one to for, any one who had and two of those to compare ?
What other lenses do you have/plan to get soon?
04-01-2011, 05:19 PM   #12
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got k-x with dal 18-55mm, dal 50-300mm and fa50mm, i was planning to get 17-70 to replace 18-55mm, replace fa50mm to something shorter ( something like sigma 24mm f1.8) and leave that 50-300 for now, macro i dont see need for now, plus im still thinking to upgrade to k-5
04-02-2011, 11:48 AM   #13
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or just found DA* for 770

Pentax SMC DA* 16-50mm f/2.8 ED [IF] SDM

how this one is comparing to the rest ?

cause by few test ive found DA17-70f4 scored better than tamrons 17-50f2.8 an complains that it performs more like f3.5
04-03-2011, 11:31 AM   #14
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bump form second page, im now deciding between tamrons 17-50f2.8 and pentax 17-70f4 any1 ?
04-03-2011, 11:43 AM   #15
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I really like the 16-50mm. Sometimes it is a little big though. I had the Sigma 17-70 f2.8-4.5 and it was a nice lens too. Especially for the price. Its build quality is not up to the Pentax but its IQ is very good.
If I were to give up the 16-50, I would go with the Pentax 17-70. Regardless of the opinions about SDM, It is very nice not listening to screw drive ratchet around.
I am still interested too in the 18-135mm but have not been excited enough about what I have seen to buy one.

Last edited by GaryH; 04-03-2011 at 02:05 PM. Reason: added
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