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11-18-2008, 11:57 AM   #1
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sigma 70-200 vs. pentax 50-135?

Surely there is already a thread where someone is trying to decide between the two. Can someone send me a link if it exists and they know how to find it?

11-18-2008, 02:03 PM   #2
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They are both fine lenses - I have both. But the sigma haven't seen much action since I got the Pentax. It's lighter and the range fits better with what I do (and it feels nicer).

I will probaby sell the sigma (when I find the papers), and I'll probably miss the extra reach the next time I see a bird worth shooting... but I'll survive (or buy a long prime).
11-18-2008, 03:50 PM   #3
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I tested them both some weeks ago, along with the Sigma 50-150.

Weight and size are hugely different, the 70-200 felt just too heavy to carry it around. I'd say focus speed is almost equal between the Pentax and the small Sigma (slight advantage S.), while the big Sigma felt about 30% slower. Both Sigmas are virtually inaudible, the Pentax makes some very quiet "srrrrrrr" sound while focussing.

One thing I noted was sharpness at close focus distances:
The Sigma 50-150 showed CAs when focussed at the MFD (1m, I guess), while the Pentax did not. Sadly I didn't try this with the 70-200.

I pointed all three lenses straight into a strong light at the ceiling and could not find significant (though visible) weakness in flare handling with the Pentax.

The 70-200 might be a little bit less sharp at max tele than the other two, but still very good.

Anyway I agree with tcdk, both (or all three) are very good lenses.

Have you had a look at the Tamron 70-200?

Last edited by Noisychip; 11-30-2008 at 03:49 AM.
11-20-2008, 05:35 AM   #4
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it depends on what you shoot, and the fit into the rest of the kit.

I own the sigma APO 70-200 F2.8 EX and use it both alone and with 1.4x and 2x TCs. BUT I shoot wild life as well as indoor stage productions, and appreciate the extra length at F2.8. The bottom of my range is supported by a tamron 28-75 F2.8 a pentax 18-35 F3.5-4.5 FAJ, and the sigma 10-20.

If you only shoot with the shorter focal lengths, (i.e. no or limited wild life) I can easily see using the 10-20 sigma or pentax 12-24, plus the 16-50 F2.8 and the 50-135 F2.8 as your main kit. Even if you wanted wild life, then get a 300F4 prime, and you are just as good.

when considering any zoom like this, it is time to plan out your entire lens kit.

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