minimum focus 0.48m for 1:1 on a full frame but 1.3:1 on 1.3x crop
internal focus; very sharp; 72mm filter
probably a bit too long for medical work and heavy (1.09kg)
AF a bit slow for mainstream telephoto work especially if it has to search (4-5secs), help it by MF to the correct range then let it AF, action photography is possible, eg. birds in flight.
very shallow DOF, bokeh not so good at f/5.6 or smaller when you need it
really need a monopod or tripod for macro work given its weight but hand held can be fun
more difficult to use than the 100mm macro but the longer working distance is better for live bugs, etc
compatible with tele extenders eg. 1.4x TC on a Canon 1D gives an effective 328mm f/4.5 lens with 1.8x macro
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