new lens help needed

[clive]

for xmas my wife has bought me a sigma 120-400mm lens which im hoping to use for bird photography what i wanted to know is what would be good settings for a starting point ie if selecting apperture priority would i need to select auto for the iso settings or is it better to select shutter priority i realise you will need a fast shutter for some shots.
i havent had chance to play around yet but maybe someone could point me in the right direction.
btw this lens is coupled to a nikon d300.
regards
clive.

 

[fracster]

Aperture priority.

Set the aperture at F8.

Set auto ISO max 1600, min shutter speed 500 for static subjects, 2000 for BIF.

Rough guide only, see how you go on.