Sigma 100-300mm f4

[Reed Goodwin]

Hi all,
So as my second lens I purchased the Sigma 100-300mm f4. I love this lens so far. Quiet focussing, beautiful bokeh, fast focussing, and it's not terribly big. I have yet to look at my photos on a computer screen, but from what I can tell they seem quite sharp, even at f4. I must agree with other reviews of this lens, though, that is could definitely use an image stabilization system. Which brings me to a question: on a 16.x crop body is it best to shoot at 1/actual focal length or 1/perceived focal length or faster? My gut says perceived, but I want to check.
Thanks,
Reed

[NordieBoy]

Perceived is safer but if you can get good shots at actual...

What sort of shooting?

[Reed Goodwin]

I'm doing all sorts of shots at the moment, but I've been focussing on wildlife (if only the weather would clear up and give some decent light...). Though I have not had a chance to really get out and shoot a lot, I am wondering about the sharpness of my copy. Granted I've done most of my shots at f4, but from what I've heard it should be pretty darn good at f4. Sadly I cannot post pics for the next few days as the computer I'm using won't let me download pics. Once the skies clear up a bit I'll try to do some testing.
Reed

[condyk]

Great lens ... I used to use shutter at 1.6x focal lengths give or take, but if you can go less then fine. It's just a guide. As to worrying about sharpness ... why? Wait 'til you see the shots properly and do accound for conditions if the light wasn't so good. It really only gives its best on a mono/tripod.