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10-15-2010, 04:49 AM   #1
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pentax 100mm WR vs sigma 105mm

I own the Sigma 105 macro, and I am satisfied with its sharpness, bokeh photography, but my big problem is that when it loses focus, is lost!
My question is for forum members who may have owned both lenses, is it worth to replace it with a new Pentax 100vr, whether he has similar problems, whether it focuses faster?
My photos with the sigma you can see here!
Hello and thank you

Last edited by sadsun73; 10-15-2010 at 04:51 AM. Reason: i forgot link to my galery
10-15-2010, 05:55 AM   #2
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I am not sure to answer directly your thread, but the followings might be relevant. There have been a few threads about macro lenses #100mm with K-mount. It is acknowledged that there are 3 outstanding offers: the Sigma 105mm, Pentax 100mm (in fact there are 2 Pentax lenses, I believe) and the Tamron 90mm. All these lenses are very close and well regarded by Pentaxians.

In turn, you might not find a big improvement from one lens to the other as they are close. Yet you should consider to try them in your local store as the hand feel differs from one person to the other. In my case, I felt that the Sigma 105mm was too heavy and I prefered the lighter Tamron 90mm. I did not try the Pentax 100WR because it was outside of my budget.

Last edited by hcc; 10-15-2010 at 04:54 PM.
10-15-2010, 08:01 AM   #3
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I recently shot a field hockey game for my school. While I won't say that every shot turned out, there were more than enough great keepers from the D-FA 100 WR, so I can probably safely say that while it isn't a nikon AF-S lens, it does adequately keep up with what you're shooting.

These shots aren't field hockey, but they also give you some idea as to what the 100 WR can do. If I remember right, these were (accidently) shot wide open or so, so shooting at F9-11 would probably yield fully sharp subjects:

10-15-2010, 08:07 AM   #4
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Another plug for the 100mm WR. It's a fantastic lens!

10-15-2010, 11:16 AM   #5
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I have 100mm WR, and it is a fantastic lens indeed. Very sharp, nice bokeh, precise manual focus, and just a pleasure to handle. But AF is noisy, and it tends to hunt. I'm not sure that it will be an upgrade from Sigma 105mm for people photography.
10-16-2010, 07:28 PM   #6
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I use MF most of the time with my DFA100WR because the camera does not know which subject I want to focus on.
10-20-2010, 08:52 AM   #7
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I see sample photo above, the focus always miss, not accurate, to bad
10-20-2010, 01:41 PM   #8
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The sigma should have less problems than the pentax if you switch on its focus limiter. Have you tried using multipoint (auto) autofocus rather than select or centre?

10-20-2010, 02:28 PM   #9
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I've only owned the 100mm WR, but I can tell you with upmost honesty that it is one of the sharpest and most well-built lens you can purchase at its price. The Sigma is probably just as sharp, but the WR compatibilities is very handy when it is required. And the size is much smaller, about the same as the kit lens. Pricier though, but I think it's worth it.
10-25-2010, 04:31 AM   #10
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Original Poster
Thank you all for your answers!
- I always use the focus limiter, it is a very useful thing, I think without that sigma was useless except for stationary objects
- I do not use multipoint, I'm not satisfied with the results, usually select
- I was hoping Pentas quickly focused on target
- WR will get me well and the front element is not pulled
I will make a final decision in the store when i try Pentax's 100!

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