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06-19-2009, 02:53 PM   #1
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How is 28-300mm lens for Pentax?

so far only see Sigma and Tamron selling.

06-20-2009, 09:26 AM   #2
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I have no personal experience with either, but since no one else has responded, I'll chime in with what I perceive to be the conventional wisdom on these:

28-300 zooms are usually very old designs, from the days when zooms were not as advanced as they are today, and "superzooms" in particular were really bad. Modern zooms - superzooms included - are usually *much* better. Throw in the fact that 28-300 is not nearly a great focal length range on digital cameras as it was on film - it's basically all telephoto, no wide angle at all - and unless someone gives you one for free, there really wouldn't be any reason to choose one of these over a mdoern 18-250 like the Tamron, Pentax, or Sigma, which are much better lenses and have actual wide angle capability.
06-20-2009, 11:28 AM   #3
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I have a slightly older version of this lens:

AF28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro; Tamron USA, Inc.

The size is great, only a bit more bulky than the kit lens. Construction seems pretty good too. Marc is right about this range being nearly all telephoto, not great for digital. It should work on film too, with a better range. I use this lens for vacations and outings when convenience outweighs everything else. IQ is acceptable within the limitations of the lens.

With superzooms, IQ is not going to be the best. Maximum aperture is going to be small especially at the long end. You won't get the maximum reach at closer distances, only at infinity. As a tradeoff, you gain a large range of focal lengths in a small package, usually at a good price. Mine was $135; they are more today.

Example photo, 300mm, f9.5, 1/750:

06-21-2009, 09:58 AM   #4
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QuoteOriginally posted by Just1MoreDave Quote
I have a slightly older version of this lens:

AF28-300mm F/3.5-6.3 XR Di LD Aspherical (IF) Macro; Tamron USA, Inc.

The size is great, only a bit more bulky than the kit lens. Construction seems pretty good too. Marc is right about this range being nearly all telephoto, not great for digital. It should work on film too, with a better range. I use this lens for vacations and outings when convenience outweighs everything else. IQ is acceptable within the limitations of the lens.

With superzooms, IQ is not going to be the best. Maximum aperture is going to be small especially at the long end. You won't get the maximum reach at closer distances, only at infinity. As a tradeoff, you gain a large range of focal lengths in a small package, usually at a good price. Mine was $135; they are more today.

I have what I presume is the newer version of this same lens, having bought it about 18 months ago, and paid more than $300 for it, to B & H. In my opinion it's a good lens for most purposes. Especially from the lowest focal length out to about 200 mm. From there on to the 300 mm, the sharpness is not equal to the lower 2/3, but it's still very usable and I consider it an overall good buy.

06-21-2009, 11:08 AM   #5
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I had the older, non-DI version of the Tamron 28-300 and I really liked it. I bought the 18-250 when it came out and wound up selling the 28-300, but for what I paid (found the 28-300 for about $150 new), I should have kept the 28-300.

As for a comparison, I found that I do use the range from 18mm to 28mm, so that was useful. The difference between 250mm and 300mm isn't that great. The 28-300, being a full frame lens, doesn't really suffer from vignetting like the 18-250 does. Both have the close-focusing, "macro" ability, and I find it useful. For the money, if you can find it, I'd recommend the 28-300, and I really like the 18-250.

I have a set comparing some shots between the two lenses, plus I found PopPhoto's lens rating charts for each.

Tamron test - a set on Flickr
06-21-2009, 11:30 AM   #6
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I have a Sigma 28-300mm 3.5-6.3, 1:3 macro. The current 28-300 Sigma and Tamron lenses have not been around too many years, like any superzoom they have compromises but it's decent optically and it gets its fair share of use when I know I'll be shooting tele to 'standard' angle shots and don't want to be switching out lenses. From examples I've seen performance would be similar to what you'd see in the 18-200mm super zooms, just with much less wide angle and more tele.

Last edited by F16; 06-21-2009 at 11:37 AM.
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