I've been meaning to ask this for a while but keep forgetting.

Most of Pentax's film bodies, the ME-Super and MX in particular,
are listed as having -1.0 Diopter eyepieces.
On the MES adding a -3 for my right eye, or a -4 for my left eye
is about perfect.
On the MX a -4 is way too much for my left eye (headache too
much) but a -3 isn't enough for my left eye.
My prescription 'distance' glasses are -4.25 left, and -3.75 right.

1. Does anyone know why the MES and MX are so different
though both are listed as being -1?

2. Am I wrong in thinking what I'm doing should result in -4 or
-5 diopter correction, depending on whether I use the -3 or -4?

3. Does anyone know where I could get custom diopters made?
None of the opticians I've asked can deal with lenses this small.
(About 13mm x 18mm) Actually _none_ of them can deal with
glass lenses at all anymore, just plastic. ;-(

Big TIA
Don

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