Yesterday, I spent all day trying out this new consumer zoom-lens on the field with my D800 and D4s (a friend of mine lends it to me for a week) to chase some local birds.
My very first impressions :
AF : definitely much slower than my 200-400/4. Very hard for bird in flight with the D800, but very good on the D4s.
VC (stabilisation) : quite efficient (about 2-3 stops) but takes long time to operate.
Sharpness : brilliant on both cameras (very good @600mm and f/8 on the D800).
Contrast & colour rendition : need more post-processing works to get close to my Nikon lenses.
Handling : excellent !
A very impressive tele zoom-lens considering its price tag !
I've already ordered one for myself : it will be my tele travelling and walk-around lens.
#1 : D800, @190mm, 1/1250", f/8, 280 ISO, VC Off, hand held. AF-C & Dynamic 51-Points.
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#2 : D800, @550mm, f/8, 1/125", 1800 ISO, hand held, VC On. AF-C & Dynamique 51-Points.