T3D More macro quesions,... using slide bar

[Lme Kbee <jet_lk@xxxxxxxxx>]

I have shot some cool macro stereo shots using a slide bar and my slr.
 Now that I have heard the discussion of needing more light with
extension tubes, I have a new question.

What are the pros and cons of using extension tubes, and also the same
for using plus lenses instead.

Some one had asked what was the size of subjects I wanted to shoot,
well......  Something that is 3 inches tall, and all the way down to
something that is only a half inch tall.

So is the better thing with extension tubes that you get a sharper
image, and with the plus lenses you can have more light?

ALso, how hard (or expensive) would it be to find a pentax K mount
lense that has an fstop beyond f22?

Thanks,

Lincoln
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