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09-19-2012, 04:42 AM   #1
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Third Party Lenses?

Thank you all in advance for taking the time to read and reply to my post....
I am hoping to get some advice in regards to third-party lenses vs. Pentax brand lenses.
I'm considering a revamp of my lenses and, initially purchased Tamron lenses (70-200 2.8, 28-75 2.8 and a 10-24 3.5-4.5) and they served me well for more than a year or so. I'm wondering if trading in these lenses for Pentax DA/FA lenses in comparable focal lengths is a recommended option by you guys? Is there that much difference in IQ, AF speed, etc,. I am a full time photographer/photojournalist and this has been swirling around in my mind for a few months now. I have a 50 1.8 Pentax and am amazed at the IQ and sharpness of this little wonder.
Any input is appreciated.
Thanks,

09-19-2012, 04:52 AM   #2
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The reviews of the UWA zooms really put those, what 5 now, lenses through their paces. One of the Sigmas came out on top, but the Pentax was 2nd.
Sigma 10-20mm F3.5 vs F4.0-5.6 - Introduction - PentaxForums.com

On the 70-200 the Tamron was sharpest in the comparison but the Sigma won overall.
Fast Sports Zoom Lenses for Pentax - 70-200mm Sigma & Tamron - PentaxForums.com
09-19-2012, 04:58 AM   #3
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If you're looking for FA* lenses of comparable focal lengths (FA*28-70, FA*80-200), they might be a little hard to find and pricey. They will compare favourably - most likely as sharp or sharper, but nicer color rendition.

If you're looking for DA* lenses (and DA), then you are looking at the DA 12-24, DA*16-50, and DA*50-135 or DA*60-250. You aren't going to find a close equivalent, as you are using an APS-C camera already. The DA 12-24 is fantastic, DA*16-50 probably a little worse than the 28-75 (but WR!), the 50-135 is as sharp as the 70-200, just shorter (but WR and smaller!) and the 60-250 is pretty close to the 70-200 (sharper on the long end, but F4).

If I were you, I'd replace the 10-24 with the DA 12-24, but keep the other two - unless you find the WR of the DA* useful. The FA* may be good - but they'll be hard to find, and you probably have to spend a bit to get them (FA*28-70: ~$700, FA*80-200: ~$1100)
09-19-2012, 05:11 AM   #4
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Some Pentax lenses are better than the third-party equivalents, some are equal, some are worse. The answer must be given on a case-by-case basis, however, third-party manufacturers are just as capable as Pentax to make great lenses.

09-19-2012, 05:30 AM   #5
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QuoteOriginally posted by bdery Quote
third-party manufacturers are just as capable as Pentax to make great lenses.
And some Pentax lenses are just rebadged Tamrons, and in at least one case, Cosina.
09-19-2012, 06:38 AM   #6
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As Bdery said, it's really on a case by case basis. Tamron and Sigma make excellent lenses. I suggest you do some mining of this sites lens data base before you start swapping lenses. There is some really good info there.
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