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10-06-2011, 04:56 AM   #1
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Pentax 50-135mm vs Sigma 70-200

Hi guys,

I'm about to buy a tele-lens and would like some suggestions choosing. Heard a lot of great things about the 50-135mm and 60-250, but 60-250 is not in stock in my country. Also heard good things about the Sigma but there's 2 versions, the macro and the OS, the macro being much cheaper.

What is the main difference between the 2 different Sigma and how do they compare to the 50-135mm? Thinking of getting a used 50-135mm but the SDM issue makes me have second thoughts...

Would be great if someone can point me in the right direction.

10-06-2011, 06:03 AM   #2
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Both are nice lenses - the 50-135mm SDM appears to be more reliable than the 16-50mm has been. I have owned mine for 2.5 years, used it only on occasion over the past year or so and have had no problems with it.

The 70-200mm is a significantly larger lens (almost 2x the size/weight if memory serves). If you get the sigma, I would go for one with their HSM focusing, as it is extremely fast, much faster than Pentax's SDM focus.

Sigma throws around the term Macro pretty loosely, so I wouldn't let that designation sway your decision.

In the end the focal range and speed of the 50-135mm make it an excellent portrait and outdoor enthusiast lens (being fully weather sealed). The 70-200mm from sigma I would categorize as a sports/action lens. Depending on your need from those two situations would probably be the best way to determine which lens you should buy.
10-06-2011, 09:12 AM   #3
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The difference really is in size (Sigma is bigger obviously) and whether you think you would want a little more length versus 20mm on the wide end. I have used the Sigma 70-200 HSM (non-OS). It is sharp -- a little soft at the long end, but gets better at f4. Still, for my type of shooting, the 50-135 is definitely the better lens. In particular I like the fact that it is more than a little smaller and sealed.

I guess I should add that HSM is quite a bit faster, although in practice both lenses are adequate to focus in most situations.
10-06-2011, 03:01 PM   #4
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I have had 50-135 and Tamron 70-200.
The DA* is much smaller and lighter than the 70-200. Uses smaller filters too. SDM could be faster but for 90% of normal real life shooting it's OK. Lately I haven't heard much about 50-135 problems...
IQ wise the 50-135 is fantastic. The best zoom I've tried only rivaled by the FA*28-70 I'm just getting to know.

Conclusion, if you don't need superfast AF and like walking/ being outdoors a lot in all kind of weather then the smaller, lighter and WRed DA* makes perfect sense. And (for me at least) the 50-135 range just makes a lot more sense on APSC than 70-200.

My 2p

10-06-2011, 07:24 PM   #5

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Hard decision.
50-135 are very nice and used focal lengths for most photographic needs. Not too big and heavy and WR too.
70-200 is also a nice range of focal lengths, but sometimes more on the long side of things and 200mm may or may not get used as often depending on user preference.

There is really no right or wrong in the choice, just preference of usable focal lengths lens and how it combines with existing lenses as a complete set.
16-50; 50-135
16-50; 70-200 (the in-between is not that important)
10-06-2011, 08:23 PM   #6
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Original Poster
Well, I'm leaning towards to the 50-135 right now for the following reasons:

It's lighter and smaller
Like the shorter range more than the longer range, I like shooting landscapes and rarely shoot wildlife or birds.

Here's my setup so far:
Pentax 15mm
Sigma 17-70mm
Pentax 35mm f2.4
Tamron 90mm macro

Looking for a tele now for a upcoming trip to scenic areas in Jiuzhaigou and Zhangjiajie in China~

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