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06-21-2013, 10:54 PM   #1
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Buy the Pentax-F 100mm Macro?

A local store is selling this lens (https://www.pentaxforums.com/lensreviews/SMC-Pentax-F-100mm-F2.8-Macro-Lens.html)
for a decent price.

I'm debating buying it. My thoughts are along the lines of:

I already have the 95 mm Panagor (https://www.pentaxforums.com/userreviews/panagor-90mm-f2-8-macro-pmc.html) lens.

The Panagor is OK, but it's heavy and manual focus - it's hard to take any pictures without a tripod due to camera shake. Even with a tripod, the subject could move (small breeze, etc). What appeals to me about the Pentax lens is its autofocus even though it's heavier. With my previous Olympus, I had the F2 50mm lens (2.0 crop factor) and took some great macros with it hand held because its autofocus would compensate for my hand's slight movements towards/away from the subject. I know many reviews say one doesn't need AF for macro lenses, but with this much telephoto I think I do.

The downside to all this is that with my K-30, the Pentax lens will be a strong telephoto, and I have a feeling I won't really use it for much more than macros (whereas the Olympus 50mm was good as a "general" lens). So while it may be a great lens, I wonder if it's worth spending that much money for something that I'll rarely use.

Thoughts? I'm inclined to stick to the Panagor unless someone can convince me that I'd actually use the 100mm Pentax for things other than macro on an APS-C sensor. What have others used it for?

Thanks.

06-21-2013, 11:09 PM   #2
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Depends on what a decent price is. I have seen F and A 100mm macros offered at more than a new dfa 100mm WR.

I doubt the AF is going to be able to compensate for hand movement using screwdrive. But i`ve never tried it so who knows. I don`t find AF useful for macro though.
06-21-2013, 11:13 PM   #3
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I'd say stick to the Panagor if you are doing macro.
If you do portraits of willing subjects, its also still alright to use it (slow to turn the focus)
If you do candids or unwilling subjects, then maybe the 100mm macro with AF might be better than the Panagor.
My few cents
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