getting closer is always nice, but closer than 3 ft is very difficult with a goby that's doing it's security job. at 3 ft a goby (not to mention the shrimp) doesn't fill much of the frame with 100mm. I've used the 70-200 on land with the 500d and extensions tubes for close - up of flowers and critters. quality is good and autofocus is faster than macro lenses. with a 12.5mm extension tube the 70-200 focuses from more than 5 ft down to 24 in.
With enough extension tube it will work as an autofocus lens at preset focal length - both zoom and MF are serious challenges, but not really necessary for the application (but zoom would make other subjects possible as well). looking at my collection of left-over zoom rings, zoom may be possible (but probably not with extension tube, but +1 diopter may be okay).
So I may make this a project. relevant advice welcome.
steverMember Since 08 Jan 2006
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