t2i

[Anbesol]

The 100mm macro is definitely a couple notches above 'medium quality'.

[daq7]

How do you tell what the really good quality lenses are?

[Franglais]

How do you tell what the really good quality lenses are?

I read the reviews in magazines. Chasseurs d'Images is particularly good, I've been following them for years.

I look at sites like Photozone.de. Their results are pretty much in line with the Chasseurs d'Images

I read the reviews in this site. The user reviews are not as technical as the others but they're interesting, real-life experience.

And finally I do my own testing with my stuff. That's what counts - what I can actually achieve.