Quote Originally Posted by slayer7124
I have that lens too. Every time I am at full zoom on a subject it doesn't come out sharp, especially with insects. Is it the lens, focal length, or just practice?
At 300mm it's a known fact that it is softer. From 70 to 200, it has outstanding resolution (http://www.photozone.de/Reviews/46-n...report?start=1 ). Try closing down when shooting at 300mm. You said you shot insects @300m. I hope you are using a tripod, otherwise, I think the image would be a bit soft if you need to use the max f5.6 because you're shooting hand-held and need a fast shutter speed.

One thing also, the images posted on the web usually have been sharpened