I have been keeping ISO on Auto... All these days i was using one focus mode.. which i changed to AI Focus from last week and using high speed continous shoot... still there are some confusions on focus part.. while i am able to see the circle on the view finder on the object after opening the image in computer i am finding focus slightly below where i have seen on view finder while clicking... my be my adjustment is wrong...

Also i have started using manual focus as in auto focus i am loosing good images of birds on trees or bushes and a small twig or leaf in between is disturbing the focus.

Need to practise a bit more...

Your inputs are helping... had been to Hesarghatta lake yesterday... experimented a bit... i think quality of my images has become a touch better

Thanks a lot