Can anybody there to outline me best practices for wildlife photography. Is it aperture priority or shutter or simply M mode...I would like to have close sharp birds photo by using D7k wid 300f4D...any suggestions / guidance please.
That's a rather broad question. You may use all the exposure modes, depending upon the situation, at one time or another. And a 300mm isn't usually long enough for birds, especially small ones. Adding a 1.4 or 1.7 tele-converter would help.
Pradatta, In my few months here I have found that there are a number of ways to get from point A to any other point in photography. These guys are very helpful with a particular question or a particular situation. However, when it comes to "just tell be what to do" they are hesitant to broad brush something.
One suggestion I can give is specific to the 300mm f4. I always shoot in A priority for everything. I found my 300mm f4 has a sweet spot at f6.3. I set my camera on a stable surface and focused on an objective and shot at each aperture. I did this on several objects. It seems from f4 to f10 the sharpness is equal except for f6.3, where it is much sharper. I use this aperture most of the time. With a TC (1.4 or 1.7) usually f8-f10 is best. You may want to try this with your lens if you want the sharpest image from your lens. I hope this is the type of info your looking for.