Originally posted by txbonds Roscot, Do you have any pictures with that Sigma 100-300f4? Curious as it has been on my radar screen pending release of the 60-250 pentax (which who knows when it will happen).....
Thanks,
Greg
I have few test shots. Nothing of consequence yet.
What I am finding is, that for the most part, this is a very fine lens. It is reasonably sharp at f4.0, and very sharp by f8.0. Good color rendition, and contrast. I like the fact that it is internal zoom and focus, and is a constant aperture. AF is fast and accurate, as in the seagull series below. What I don't particularly like is the bokeh can sometimes be harsh. In some situations it can be downright ugly. Unfortunately I do not have any examples of the bad bokeh. I either try and fix it or delete the shot as unacceptable. It is at it's worst at 300mm, long distance like #6 below. Focused close in, bokeh can be pretty darn good.
I bought this lens to shoot air shows and some sports. In those roles it should perform very well. In all, good lens and worth the price.
Hope this helps you.
Here are a few examples.
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/1000s f/10.0 at 250.0mm iso200
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/800s f/7.1 at 300.0mm iso200
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/800s f/7.1 at 300.0mm iso200
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/800s f/8.0 at 300.0mm iso200
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/1000s f/9.0 at 300.0mm iso200
I had to apply some gausian blur to the background of this one to make the bokeh acceptable.
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/1000s f/9.0 at 300.0mm iso200
Pentax K10D ,Sigma 100-300mm f/4 APO EX DG 1/640s f/8.0 at 180.0mm iso200