Hi Stoshu, Welcome to the hog farm. :-D
I'm a Tamron shooter.
Something I have learned about the Big Tammy, Patience.
This lens, in my experiance, is very definitive about being right on spot as it has a ... sensitive... depth of field.
Don't get discouraged if you aren't getting what you wished you were at first.
I use a single point focus with mine, and squeeze that trigger.
If you aren't dead on, you will get what the lens is locked on.
I learned a lot from Regis here on UHH. He can get his Tamron 150-600mm to capture
very fine photographs.
I'm finally getting there with mine. But it has been with a lot of trial and error, error, error, on my part.
But maybe proof-it-out with stationary targets before moving on to moving targets. And study the DOF you achieve. It can be maddening at first.
And I believe that lack of understanding has lead to people declaring it "soft". When in fact, they expected it to be broader ranging. It's not, it is very precise.
That understood, it is a great lens at it's price.
The next one up is the Sigma Sports Model, 150-600mm which is receiving accolades from it's new users.But it is also nearly $1000 more in price.
Don't forget that today's high megapixel sensors allow a lot of crop room. And at 36 MP, you have the best camera going.
Have fun!
And do show us your progress with your Big Tammy. ;)
Here is a recent post with some DOF examples I put up:
http://www.uglyhedgehog.com/t-278646-1.html#4702802