Quote Originally Posted by sedwards View Post
Here is another question then. If i have a crop sensor and shooting 300 mm is 1/320 shutter speed my minimum or hould i multiply by 1.6 ? I will post some of my pics tonight when i get home .its mostly when things are far and im at 250+ mm that i find it is not sharp at all. Even in bright sunlight ive tried from f6.3 to f11 and cant see much of an improvement. Im hoping thats the best this lens can do and an L series will give me more sharpness , or maybe ill get lucky and find out im just doing it wrong lol
We'll have to peak at your pics when you post them, but here is a tip for helping a bit with focus/sharpness.

focus on the object you want in the distance- where you think it is in focus.
Then switch to live view
and zoom in 10x and manually adjust as needed.