Hi all,

I am new to photography and currently have a nikon d90 and 35mm lens.

I am planning to buy a 2nd lens, tossing between a zoom lens or a fixed macro lens

Feel that I need the zoom lens cause when trying to capture a picture of my dog running towards me in the park from far away, i need to crop the picture afterwards to get rid of distractions. Found that they will turn out quite blurry, not as sharp as I hope.
Do you think is because of my lens or the specs that I use to take it?
I use minimum of F 3 and increase the shutter speed as fast as it can go and also increase the exposure to +5 in order to obtain a bright picture with fastest shutter speed.

and I am also interested in macro photography especially flower

do not have the budget to buy the two of them at the moment
zoom lens: Tamron 18-200mm f3.5-6.3 XR Di-II Mot Nik
macro lens: Tamron 90mm f2.8 Di Macro Nik

Sorry for rambling on and on.

Thanks a lot. I really appreciate the help.

Mocha2204