I think these particular ones are only sold over here. However, a quick look
at a microscope store on the net turned up similar devices, albeit ones with
fixed 30x and 100x magnifications. The 60-100x one is actually pretty poor
quality. It is a big improvement over a 10x or less loupe (or 50mm lens) for
seeing the detail in one's slides, but a good 20x loop gets you very close
to what a cheap microscope does.

David J. Littleboy
Tokyo, Japan

Yes. Comparing a 20/2.8 with a 20x loupe, both give a similar degree of
magnification, but the 20x loupe shows a larger area of the subject and
comes with an adjustable plastic ring that holds it at exactly the right
distance from the subject. The 20/2.8 may give a tad sharper more contrasty
view. Maybe.

But at higher magnifications, one only sees a tiny part of the image, so one
needs multiple loupes.

David J. Littleboy
Tokyo, Japan

You are definitely right there.  Can see a reasonable patch with a 50m f1.7.
With a 24mm can only see a tiny spot.  Also there is some patterning - I
suspect it's my retina or blood vestels in my eye.  Might be tiny defects
in the surface coating of the lens - its something but not something you
usually notice.

Can't see any fringing on the blocked up window or on the flag pole.  I
can't see a hint of anything that is not sharp.  :-)

Not that it affects the fringing but I should have left the curves alone and
left the scan darker.  I made a simple adjustment to make the side of the
church in shadow lighter when in fact it was deep shadow.  Brightening this
up showed up as some grainyness (not sure if it is traditional grain) in
the sky.  On the slide the sky is somewhere between royal blue and almost
navy.  Perhaps Provia and polarisers can go over the top but I prefer that
to washed out skies.

BTW - Pete's TLR polariser hint - buy two and line them up!

Pete