I've used macro extension tubes previously on a Sigma 70-300 APO DG macro which I was impressed with, but the sharpness and resolution of this lens on my Sony A77 is exceptional. Very, very pleased with this purchase, and glad I chose this above the lower spec as the USD motor is silent and very quick - especially when using the focus limiter. Manual override is smooth and quite controllable. This lens is also very good for portraits and I'm considering ditching my Sony 50mm F1.8 SAM and using this - sharpness is excellent at F4 and F8. Note for Sony there is no VC option as the lens relies on Steadyshot in Alpha camera bodies.