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Yeah a question I am looking at too for my Canon 600D.
The thing with the tubes is that the auto focus lenses have such a small travel that fine manual focus can be a nuisance.
The reviews on the new Sigma 60 give it an excellent mark and with an aps-c sensor it's almost 100mm.
My thinking is the wider the lens the more DOF you have in close up over longer focal lengths.
I veer toward manual focus and since my subjects (Fungi) don't move I am tempted to use an adaptor and an old classic bought off ebay that lets me use a ring flash and aperture preferred settings.
The auto focus tends to pick the nearest point of the object and the DOF is squandered in the lens-ward direction, so I prefer to focus manually anyway. (I know it can use a single point focus directed to anywhere on the subject but I don't want want to hold down a button to hold focus lock).
Thems my thoughts for what they are worth. Good luck in you deliberations.
Trev
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