> The very common and cheap used Vivitar 2x-21 telexender can be
> very
> easily converted into a 26mm auto tube. Just remove the 3
> screws on the
> back and carefully work the rear assembly off. Unscrew the
> rings and
> such holding the lens elements, remove the elements, remount
> the rear
> assembly, and you are done. If you prefer a manual tube, just
> remove
> those parts too.
However, you will want paint the "tunnel" with flat-black paint
otherwise the center portion of the image will hot-spot from the
reflection.
Keep the aperture mechanics in and you have an "auto" extension
tube.
AG
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