T3D Re: More macro quesions,... using slide bar

[erker@xxxxxxxxxxxxxx (Greg Erker)]

>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.

  Since you mention Pentax lenses I'll also
mention that the 50mm f1.7 is supposed to be
the best of the Pentax normal lenses for use
on a bellows (or extension tubes). The f1.4
and f1.2 don't perform well and the f2 is just
a less good lens at all magnifications.
(Source: the Carl Shipman book about Pentax
cameras, ME Super vintage.)

Greg E.



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