Im going to get a new lens in Januari. Some of the 70-200mm L versions. I think the 2.8 version are BIG and heavy and a bit pricey, but i like to take pictures in low light. The f4 is more in my pricerange... So, I get the 2.8f with "just changing the ISO a step or two". And getting a little bit noise.
I cant make out my mind... which one should I get?


