jancohen
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Aaron D wrote:
But since you macro guys know from experience, is a worm drive really generally more superior? At 500/6.3, DOF is extremely thin. So thats why Im asking here.
Actually, if you really want stability, you've got to spend money. What macro guys use for the most part are higher end rails and/or contraptions they build themselves using things like translation stages (search eBay for Newport linear stage), microscope focusing stages cut out of surplus, higher-end microscopes, etc. Some get quite involved, especially when it comes to stacking images that were photographed using microscope objectives and other lenses used in high magnification setups.
That said, whether screw or gear driven, stability in a focusing stage really derives from the sum of its parts, meaning quality parts. There are expensive focusing stages that don't lock down well or don't allow you to focus smoothly, in contrast to some cheaper stages that do a better job of that.
In any event, I mentioned the Minolta stage as an example, I haven't used one myself. Minolta did make fairly good equipment though, so I'm guessing you might be alright with it. Or you can wait until someone who's used one chimes in. Or you could ask in the Macro section here at FM. Somebody there might have experience with the Minolta.
Edited: oops, looks like you were already posting the question to the Macro section.
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. Id prefer a "smallish" worm drive, so might just pull the trigger on one of these Minoltas. 
Next time I'll send such listings in a PM instead of posting them publicly.