[Woods12]

I am looking a few different lens but unsure which if any of the following would be worht spending my money on, I have pentax K100D. These are a list of the following lens that I am looking at that seem to be in price range at the moment. I would be taking pictures for sporting events and wildlife.
Sigma 28-200mm F3.8-5.6 AF
Sigma 100-200mm (do not anything else about this lens)
Sigma APO 400mm F1-5.6 AF
Sigma 70-300mm DG F4-5.6 AF
Phoniex 100-400mm AF/MF
Pentax Da 18-250mm F3.5-F6.3
I would be taking pictures for sporting events and wildlife.
I am open to any other suggestion on a lens that would be good for the pictures that I would be taken.

[Lowell Goudge]

I would suggest a 70-200 f2.8 from anyone who makes it. plus a 1.4x TC

At present I believe all makers, tokina, tamron and Sigma have new PK mount lenses planned, I don't know the release dates.

Sigma made one in the past (APO 70-200 f 2.8 EX) but they are hard to find used.

TC gives you additional reach when you need it,.

Otherwise, really you are into specialty 300 f2.8 lenses etc.

Longer version zooms, 150-400 F5.6 or bigma can be too slow at times.

[ftpaddict]

There is also a Pentax FA 100-300, if you find it useful.

[Anastigmat]

I am looking a few different lens but unsure which if any of the following would be worht spending my money on, I have pentax K100D. These are a list of the following lens that I am looking at that seem to be in price range at the moment. I would be taking pictures for sporting events and wildlife.
Sigma 28-200mm F3.8-5.6 AF
Sigma 100-200mm (do not anything else about this lens)
Sigma APO 400mm F1-5.6 AF
Sigma 70-300mm DG F4-5.6 AF
Phoniex 100-400mm AF/MF
Pentax Da 18-250mm F3.5-F6.3
I would be taking pictures for sporting events and wildlife.
I am open to any other suggestion on a lens that would be good for the pictures that I would be taken.

It really depends on your own needs. If you need a 400mm, then a 200mm lens won't work. If you don't want or need a 400mm, then it is a waste of money buying one. The Sigma 28-200mm gets good reviews, as does the Pentax DA 18-250, which is the same as the Tamron. The Sigma APO 400mm is sharp, but not as sharp as the tokina 400mm AT-X. The Phoenix 100-400mm is a budget lens designed and made by Cosina. It is probably not good enough for serious bird shooters, but should be okay for those who may use it only once in a while and can't justify the expense of a good super telephoto. The Sigma 70-300mm DG is a good lens, if you get the APO version. The non-APO version is cheaper but not as sharp.