Hi there
As all my lenses are wide, the time has come for a nice long focal zoom. I don't need IS, so the choice is between the f 2.8 and the f 4 (price difference is huge, 2.8 is twice as much).
I've read thet the 2.8 is somewhat soft, but excellent quality at f 4, and that at f 4 sharpness is similar to the slower f 4 lens. Is this correct? You think the extra stop is worth 1000 dollars more?
Tamron has focusing issues, sigma as well... this is a major investment as noone pays me for my photos, and i really don't want to do something stupid.
thanks for your advice
[as usual, please direct me to the relevant thread should I have missed it]

