Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

This Lens is very sharp and works fantastic with the K-7
PRO: Fast AF much better with the Firmware 1.03 in the K-7 Very sharp pictuers, nicy Bokeh

CONS AF litel bitt noisy would be better with HSM Drive

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

I was surprised how good this lens is. I doubt there is a better zoom in it's speed and range.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

I had a Sigma 135-400 and a Tamron 70-300. Optically, it is significantly better than either one; it is also significantly heavier. Resolution is excellent even wide open. Being a constant f/4.0 lens, achieving a nice subject/background isolation is relatively easy. I have complete confidence that I can take a technically correct picture, so I am again the limitation. I am also thinking of getting the 2X TC down the road.

The not so good side includes 1) weight and 2) filter size. It is big & heavy as well as attracting attention - wanted as well as unwanted. A good sturdy tripod is mandatory along with a cable release to maximize stability. A good 82mm circular polarizer is well over $100 and even a UV is not cheap. So, factor in all these costs when you decide to buy this lens.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

I shoot mostly wildlife with mine, works well with a 1.4x or 1.5x T.C. also. Mine is nice and sharp even at f4.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

A lot of people say to stick to prime lenses for good quality. In this case it doesn't apply. Very versitile range and sharp all the way through.
Moderately fast at f/4 and also sharp at all apertures. Do not worry about using wide open!

This lens balances very well also. I hear a lot about the weight of this lens, but to me not much of a concern. No its not a feather but....

Build quality is solid and user friendly. I would most definately highly recommend this lens to any one. I already have.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

I use this lens for wildlife and sports photos. The focus is auto focus is quick/accurate and at F4 fast enough to capture clear action shots.

Weight can be a bit much but with shake reductions not really an issue, unless your holding it for a long time.

Overall, nice price performance package.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

I mount it on my monopod for quick distance shots and on my tripod for longer shutter speeds. If they made a 120-300mm f:2.8 for my Pentax K-10-D it would be bigger, heavier, and costs over [$], with the money I saved I'm getting a Pentax K-20-D.

Comments about Sigma Zoom Telephoto 100-300mm f/4 EX DG IF Autofocus Lens for Pentax AF:

This lens is quick for not being a hsm. Sharp and the sr works good with this lens. One thing to be aware of though, when using the 1.4 teleconverter, the shake reduction still recognizes it as a 450mm lens. Sharp throughout the zoom range.

Problems Encountered: Heavy and that is about it.

Previous Equivalent Items Owned: Pentax smcp-fa 300