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08-07-2011, 07:43 PM   #1
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sigma vs pentax

hi i am looking to buy a new lens for my k5 and want to know if the sigma or tamaron lens are ok budget is about 600 au.

08-07-2011, 07:51 PM   #2
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Sigma lenses are excellent- in fact, their lineup is bigger than that of Pentax!

Here are the current lenses:
Sigma Lenses for Pentax: Current Zoom Lenses - Pentax Third-Party Lens Review Database
Sigma Lenses for Pentax: Current Prime Lenses - Pentax Third-Party Lens Review Database

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08-07-2011, 07:54 PM   #3
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There are lots of great Pentax lenses for <$600 too. I tend to go for Pentax to ensure compatibility with AF, lens AF adjustments, better build quality, generally smaller size and consistancy of colours between my diff lenses. I only consider Sigma/Tamron where there is a large dollar gap (eg Sig 30 f1.4 vs FA31), or there is no Pentax equiv (eg Sigma 8-16mm, Sigma 500mm f4.5), or you want a good quality zoom but not the SDM worry (eg Sigma 50-150, 70-200, Tam 70-200).

Last edited by twitch; 08-07-2011 at 08:01 PM.
08-07-2011, 07:54 PM   #4
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Sigma and Tamron are well-known and respected third-party lens manufacturers. Important: if you buy a non-Pentax lens, do make sure that you buy a Pentax bayonet K-mount. (For example, a Canon mount would not fit on your camera..)

At the end, the lens (rather than the brand) is possibly more importan. As part of your research, you could check:
- relevant threads in PF on a particular lens,
- the PF lens data base (users' reviews, in-depth review),
- independent lens review website like Welcome to Photozone! and Camera lens tests, user reviews, camera accessory reviews - SLRgear.com!, and
- try yourseld the lens in the local store.

Hope that the comment will help.

08-07-2011, 08:06 PM   #5
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ok thanks i have a pentax 55x300 but there are other lens for more dollars what are the difference bet twin these lens and i was looking at a prime da 200 why is the price so high for these when there is no zoom .
08-07-2011, 08:07 PM   #6
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i suppose the real qestion is the price difference and what you get for it .
08-07-2011, 08:14 PM   #7
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If you want 200mm and want f/2.8 and want zoom, then look at the Tamron 70-200 f/2.8m, that's ~ $1k local price. The Pentax DA*200 f/2.8 costs what it does because 1) it's the sharpest lens you'll get @ 200mm, 2) it's weather sealed (dust and rain) 3) it has SDM instead of screw drive 4) compared to the 55-300 it has a much wider aperture @ 200mm (about 1 1/2 stops difference).

The best upgrades over a Pentax 55-330 are really 1) Tamron 70-200 at ~$1k or 2) Pentax 60-250 at ~ $1.3k.

Last edited by twitch; 08-07-2011 at 08:22 PM.
08-07-2011, 08:15 PM   #8
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Price difference is a concern, sure - however, a $600 bad lens is still a bad lens, regardless of brand.

To your question about why the DA*200 is so much more than the 55-300: simply put, the DA*200 is a high quality lens, with high quality optics, weather and dust resistant, solidly built, with a silent motor (SDM). The 55-300 is an entry level, basic zoom lens with none of the features that made the DA* line of lenses worth the extra money.

Also, just because it's a long zoom doesn't make it more valuable either. Prime lenses, particularly good prime lenses, are much more expensive than zooms (unless of course you're talking about extreme examples such as the Sigma 200-500mm F2.8 APO EX DG, valued at US$28,000-30,000. :-)

08-07-2011, 08:22 PM   #9
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ok thanks so the da 200 or 300 seems a better choice for a few extra dollars and then i would need a smaller lens for close ups .
08-07-2011, 08:30 PM   #10
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The quality long Pentax options are:
DA*200
DA*300
DA*60-250

The DFA 100mm macro f/2.8 WR is probably the best option for close ups.

All these lenses have superb image quality, none of these lenses are cheap.

On a "budget" I'd consider the Tamron 70-200 (but is pretty large & heavy) and the Tamron 90mm macro or Sigma 105mm macro. Really there are no "bad" macros made by anyone these days.
08-07-2011, 08:43 PM   #11
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Aus, it depends on how much money you want to spend, but as twitch has mentioned, you do have several options in the Pentax DA* line, plus more options in the Tamron/Sigma lines.

If weather and dust resistance are a big concern for you, then neither Sigma nor Tamron offer built-in environmental protections.

Depending on your shooting style and budget, you might want to get a good range zoom combo like the DA*16-50 and the DA*50-135, plus the DA*200 to complete the set.

Or you might want to consider the DA*16-50 plus the DA*60-250.

If your budget is limited, you could also go with the smc PENTAX-DA 18-135mm F3.5-5.6ED AL [IF] DC WR. Not the high quality of the DA* but does have weather resistance built-in.
08-07-2011, 09:51 PM   #12
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before you go off buying lenses, what's wrong with the ones you have now? why exactly do you want a new lens? Are there any specific goals you're trying to achieve with these new lenses? What is it that your currents can't do that a new lens can?
08-07-2011, 09:58 PM   #13
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The Tamron 17-50mm is great, comparable to the Pentax 16-50mm in terms of picture quality but it doesnt do 16mm and lack weather sealing. And build quality is VERY SLIGHTLY worst than the Pentax. And for the Tamron 70-200mm is a really sharp lens but it lack SDM/HSM/USM/SSM etc, still it is a great lens.

As for Sigma I only experience with their EX series lens(50-150mm, 18-50mm f2.8, 105m macro, 50mm f1.4 etc for other mounts) and they are great. I personally feel that SIGMA's QC have improve in recent years, as I rarely need to send back lens to Sigma for calibration.
08-07-2011, 10:21 PM   #14
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QuoteOriginally posted by aus123 Quote
hi i am looking to buy a new lens for my k5 and want to know if the sigma or tamaron lens are ok budget is about 600 au.
There is nothing better than spending other folks money - however ......
QuoteOriginally posted by adpo Quote
before you go off buying lenses, what's wrong with the ones you have now? why exactly do you want a new lens? Are there any specific goals you're trying to achieve with these new lenses? What is it that your currents can't do that a new lens can?
Adpo has some excellent points. Start out from the point of what you intend to do with the lens, what sort of pictures do you want to take, in what conditions (night, mornings, low light conditions, dusty and wet environments, or ....), and the talented folks here can help you towards that end a lot better than just putting a large dent in your check book.

Believe us, there will be plenty of spending opportunities for camera gear in your future.....

08-08-2011, 01:51 AM   #15
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QuoteOriginally posted by aus123 Quote
ok thanks so the da 200 or 300 seems a better choice for a few extra dollars and then i would need a smaller lens for close ups .
Actually 300mm f4 telephoto and 100mm f2.8 macro is very good combination. My girlfriend has the same, though only in inferior Canon version.
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