I report a lot of wishes to Canon for this lens. But they ignore a lot of them.
So you are allowed to talk about the prototypes now?
If you have this lens try out aperture stars in a low light situation with f16 or f22 and you see what I mean.
Well, since few people have the lens - what do yo mean :-p ?
Compared to the prototype I am a little bit disappointed by the product quality (I don´t mean the AF and the optical quality).
So the prototype you used was heavier and sturdier? Do you see any benefits by what Canon changed?