Excerpt: I originally bought this lens for medical/scientific work before discovering (to my regret) that I'd over-egged the pudding in terms of focal length and a broader perspective was required (enter its 35mm "little brother", eventually).
Excerpt: I find it very good lens for the first 1:1 macro lens. Closeup AF is ridiculously hunting, but I use manual focus or set clamp on. 1:1 focus is best to be used on a macro rail to help focusing anyway, because even 1mm is notable distance.
Excerpt: The only real negative this lens has is the autofocus. Fringing shows up at wide apertures, but isn't a huge deal most of the time. Given that this lens is a macro lens though, you can't really expect blazing quick autofocus, as the throw is so long.
Pros: Sharp, Small, Great looking lens, WR, working distance at 1:1
Cons: Bit of fringing wide open, Autofocus isn't great (but it's a macro, so to be expected)
Excerpt: Despite this lens doesn't have automatic aperture (for those using it on a digital body) I have given it a 10 for handling due to the fact that it's diminutive size combined with light weight and the buttery-smooth focus ring makes the handling exquisite and for me I like to use it on 2.8 due to the...
Pros: Small, light, well built, sharp, nice bokeh, cheap
Cons: Purple fringing at full aperture against the light, a bit long for portraits on digital camera