Differences between these Lenses,Please?

[Snapac]

Cool, I am glad it is not $500.00, but it better be real good at this price. I believe the 70-300Sigma APO has set a real high bench mark. 15mm on the short side is a ton, but this may be at the compromise of quality on the long end..

I am renting the Pentax 55-300mm for a couple of weeks, so I will post some of the photos, I would be interested in some comparisons of this lens and the Sigma 70-300mm in sharpness and AF....anybody???

[PeteE]

I read a review on the pentax forums on the pentax 55- 300 It gave it high marks.Very sharp.

I bought the Sigma 100-300 4.5 No regrets but it is heavy. If I had read the review on the Pentax 55-300 before. Hummm The author did say cropping was better than using a TC. and gave examples.

[Snapac]

OK, been busy at work, so not alot of time to shoot, but I got a quick few shots after work. All were on a tri-pod at ISO 100 wide open. I just couldn't get it done handheld. I will try some more interesting shots this weekend, and experiment more.

criticism is welcomed...it's the only way I will learn