Sigma 400mm f/5.6 & Sony SLTs (A77)

I don't mind weighty glass at all - I used to use my Sigma 70-200 f/2.8 HSM II all the time, but I decided I'd rather have the extra reach of the Tamron over low light capabilities. Of course I'd love a 300mm 2.8 or a 400mm f/4, but I don't have that kind of money to spend on lenses.

Hopefully the new (old) 400mm f/5.6 does the trick!