Da*300 and 1,7 AFA is a frequently used combination around here. I have it myself.
It can deliver good IQ, but I find it to be pretty inconsistent.
The cons are, 1,7AFA is no longer made, and can be hard to track down. Af works, but takes a hit for sure. You loose some light, which also darkens your viewfinder (irritating to me at least). And it degrades IQ. More often than not a crop from the DA*300 will be better (super sharp lens, and I can often crop to 100% for web-images etc.). This is just my experience (Im very picky on IQ and I pixel peep..), many other are very happy with that combo.
If you can afford it, the 500 f4,5 sigma is the choise in my opinion.
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