[ponti]

因本人鏡頭重組中，
本人曾用過..
Sony 75-300mm
Sony 70-300mm G
Sigma 70-200 2.8
Minolta 70-210 F4
本來準備入70-400mm
但試幾次都係太重。

Sigma 全開又唔利~

70-300G 係OK，但4.5起步..............

龍仔a001全開2.8 ok唔ok?

現有Keep Minolta 70-210F4(Quailty OK 但慢)

和 Sony 75-300 (a700 AF 係OK可用，但又紫邊..)

就問下Tamron得唔得?

2.8 全開Sharp 唔 Sharp ???二線散景都無問題？

[plk83isab]

you may want to have a look at the review by dpreview and photozone.de.
They have very good aritcles on the tamron and sigma 70-200/2.8

When compare to the sigma,
Tamron has very high optical quality. According to reviews, the overall sharpness is superior to the sigma. It is light and has shorter focal distance. It is relatively less expensive. But the lens has no ultrasonic motor. But it really depends on whether you need such a fast focus. It has no full time MF too.