Quote: To my opinion Pentax FA 55-300 beats Sigma in almost every aspect. Ecept price.
For a lot of people price is all that matters. For a lot of people they are going to eat peanut butter sandwiches for a month or two to get this lens. And I'm guessing anyone who has more money and wants sharper images is going to go to another lens anyway.
Anyone who expects to get good shots with a 300mm lens... I have one word for you.... tripod.
If you're going to compare lenses on the forum, I have a word for you.. tripod.
If the gods of camera motion blur favoured one lens over another, that's of no interest to me. I know they can ruin 6 straight shots and then give you 6 good ones in a row, with the same lens. Asking me to believe they aren't involved in a hand held test of 12 shots would be just too crazy.. especially on a 300mm lens. My practice for shooting hand held at 300mm would be shoot as many as you can, hope one turns out. After you've got 10 or so exposures, at least 4 of which look good, get out the tripod and do it right.
There is just no way to guarantee a good shot hand held at 300mm or greater. You're throwing yourself at the mercy of the gods, or taking advantage of blind luck.