hi to everybody i have just registed i have a question i am going to my first air show tomorrow duxford i have a sigma 50-500mm lens on a canon 20d do i need to take a tripod to get sharp images, or do photographers hand hold there cameras.

thanks guys will try to handhold do i shoot at 400 800 ?
Hi Bigron
Hope you see this in time.Must agree with everything said BUT...
REMEMBER ON YOUR 20D THE CROP FACTOR IS 1.6
This means that your Bigma really becomes a 77-770mm and you should take this into account when shooting hand held.
This is a widely held misconception Anton, but it isn't so. The focal length of a lens doesn't change regardless of the size of the sensor it focuses on. The crop factor is just that... a crop. In other words a 1.6X crop sensor with a 500mm lens would give the same field of view as an 800mm lens on a full frame sensor. Ron's 50 -500 Sigma actually has the equivalent FOV of an 80-800mm lens on a full frame camera, but there's no magnification involved, (it's still a 50-500mm) so the minimum safe shutter speeds remain the same, though as I said earlier, going faster if you can is nearly always advisable.![]()