Gday all

Just wondering what the consensus is out there

I have a D90 and nikkor 70-200 2.8 VR lense

do grab a 1.7 or 2.0 teleconverter and suffer the 1.5 to 2 stop loss or pick up a second hand 80 to 400 4.5-5.6 lense

not sure which is the best way to go


appreciate some help - or is it an obvious answer