[MF3D.FORUM:1392] Those Horizon loupes again

[Paul Talbot <ptww@xxxxxxxxx>]

Several of us have commented in the past on the
disappointing quality of the Horizon loupes, in
particular regarding their suitability for use
as MF 3D viewer lenses.  (I suppose it's fair to
say our disappointment comes from the expectations
set by the product description, as opposed to what
we have a reasonable right to expect based on the
price.)

I had an interesting conversation last night with
a non-computerized customer who recently bought a
roll-film back Heidoscop from me.  He owns an MF3D
viewer that uses the Horizon loupes for lenses, and
feels there is nothing in the performance of the
lenses that would cause him to believe they are in
fact achromats.  He said he took a closer look at
the loupes, and became suspicious that they might be
"faked" achromats: i.e., they are not cemented doublets,
but singlets with a line scored around the outside edge
to make it look like it is a two-element lens.  He said
he did not make an attempt to actually disassemble the
lens itself to confirm his suspicion.  Has anyone here
studied the Horizons closely enough (in particular,
actually disassembled one into two elements) to give
a definitive determination?

Paul Talbot