Tamron 28-300 mm f/ 3.5-6.3 Di VC PZD Lens

Solid build.  Good lens that covers a lot of lenses.  Sharp in some cases on test charts on two camera bodies.  It's only sharper when stopped down to f8 or better.  At f8 its sharp in the center and corners at 50mm thru 200mm.  At 300 mm it loses sharpness in the corners and far sides. 

At 35mm-200 this is a SHARP performer.  At 300mm, the Nikon version does the same thing, but this one is worse.  Sharp in the center but last 1/4 of each side is not sharp.

Weaknesses:

Noisy vibration stabilization but not bothersome.  Sharpness is better when you stop down at f10 or more.  Expected distortion is present.  Low light VC works okay but I notice contrast is a little less than with some of my Nikon lenses.  It is a negligible difference.

Comments:

It's good enough for travel use as a carry around all day lens.  I am no longer using it for portraits.  Because of auto-focus problems in low light, I would not use this inside a stadium or low light structures expecting action shots.