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08-25-2009, 07:05 PM   #1
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Sigma 28-300mm F3.5-6.3 DG Macro lens for Pentax

Hi, Yep. I bought me a Pentax K-7. I figured spending that much money indicates to me that I reckon I will get better physically than what I am now.

Is anyone familiar with this lens? Is it a pretty good one? Is it compatible with the K-7?

Thanks in advance.

Gailene

08-25-2009, 07:43 PM   #2
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i bought this lens but returned it.
here's a few reasons why:

1. 28 is not really wide enough
2. the aperture reported at 300 was 6.7 not 6.3
3. the widest focal length reported was 29 not 28

i don't know if there was a problem with just my copy, but i called sigma and they said the aperture being incorrectly reported is "normal". sorry, i didn't buy it.

sharpness wise, it's not bad, but i settled on a tamron 18-250 instead. much better IQ and wider too. yes, it's more expensive, but IMHO, it's worth it.
08-25-2009, 08:16 PM   #3
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QuoteOriginally posted by opiedog Quote
i bought this lens but returned it.
here's a few reasons why:

1. 28 is not really wide enough
2. the aperture reported at 300 was 6.7 not 6.3
3. the widest focal length reported was 29 not 28

i don't know if there was a problem with just my copy, but i called sigma and they said the aperture being incorrectly reported is "normal". sorry, i didn't buy it.

sharpness wise, it's not bad, but i settled on a tamron 18-250 instead. much better IQ and wider too. yes, it's more expensive, but IMHO, it's worth it.
Thanks. I am definitely leaning towards the Tamron. Are you familiar with the AF28-300mm F/3.5-6.3 XR Di?
08-26-2009, 11:13 AM   #4
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It's a generally accepted fact that *none* of the 28-300 (or even 28-200) superzooms are anywhere near as good as the 18-250. And even if they were, the 18-28 range is *hugely* useful. That extra 10mm at wide end makes a *much* bigger difference than the extra 50mm at the long end. With an 18-250, you basically don't need another lens at all - at least, not based on focal length (you might still want another one when you need a larger aperture, macro capability, etc.) With a 28-300, you'd good for maybe about 80% of the shots most people take, but you're totally stuck when you want to go wider. Unless you're getting the 28-300 for free, I'd say skip it.

08-26-2009, 05:21 PM   #5
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QuoteOriginally posted by Marc Sabatella Quote
It's a generally accepted fact that *none* of the 28-300 (or even 28-200) superzooms are anywhere near as good as the 18-250. And even if they were, the 18-28 range is *hugely* useful. That extra 10mm at wide end makes a *much* bigger difference than the extra 50mm at the long end. With an 18-250, you basically don't need another lens at all - at least, not based on focal length (you might still want another one when you need a larger aperture, macro capability, etc.) With a 28-300, you'd good for maybe about 80% of the shots most people take, but you're totally stuck when you want to go wider. Unless you're getting the 28-300 for free, I'd say skip it.
Thanks. I have decided to skip the 28-300 and go with an 18-250. Next thing to decide is Tamron or Pentax.
08-27-2009, 02:40 PM   #6
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QuoteOriginally posted by windflower Quote
Thanks. I have decided to skip the 28-300 and go with an 18-250. Next thing to decide is Tamron or Pentax.
Tamron and Pentax 18-250 are the same lens, but may or may not have the same coatings and may or may not have the same electronic chip. There was some discussion in the other forum about whether a K-7 will apply lens corrections to a non-Pentax-branded lens. Although a K-7 seems to recognize a Tamron 18-250, it is not clear so far whether it will actually correct it. And believe me, there is some correcting to be done at 18mm. I'm only half kidding about that, but it is a star performer and as far as I've heard is not surpassed by anyone's superzoom.

Unless you can determine for sure that you get the auto-correct feature with a Tamron-branded lens, I'd say go the safe route and stick with Pentax.
08-27-2009, 08:04 PM   #7
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QuoteOriginally posted by audiobomber Quote
Tamron and Pentax 18-250 are the same lens, but may or may not have the same coatings and may or may not have the same electronic chip. There was some discussion in the other forum about whether a K-7 will apply lens corrections to a non-Pentax-branded lens. Although a K-7 seems to recognize a Tamron 18-250, it is not clear so far whether it will actually correct it. And believe me, there is some correcting to be done at 18mm. I'm only half kidding about that, but it is a star performer and as far as I've heard is not surpassed by anyone's superzoom.

Unless you can determine for sure that you get the auto-correct feature with a Tamron-branded lens, I'd say go the safe route and stick with Pentax.
Thank you. I have been able to find the Pentax lens at a lower price than the Tamron, which surprised me somewhat.
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