[alexng914]

if Canon 40D use sigma and tarmon lens, good or not lei???
And is all sigma and tarmon lens no motor lei,
if yes, will it slow the focus???

Why just sigma and tarmon lens for nikon have motor, but canon no lei?

Hope all brothers can help me!

[petercyc]

some Sigma (HSM) and Tamron (such as A16 II) with Motor and the speed is fast. Both of them have canon mounted version.

[alexng914]

But io ask singsing sales in M.K, they say the HSM and the motor lens just for nikon, they cheat me.............?

[petercyc]

yes

[onjo3]

canon USM is much more silence and focus faster (a bit) than 3rd party lenses, u will like it

[gwu1]

Tight budget - get sigma and tamron. Quality okay when price is taken into account.

Budget not tight - get Canon. More expensive, but better overall quality.