Re: How to distinguish 160 vs 170 mm eypieces?

On Jan 15, 7:24 am, "Clyde Spencer" <b...@xxxxxxx> wrote:
Kevin,
    You were asked for the ISBN of your book.  You didn't respond.  I'd be
interested in looking at your book, but if it can't be found by your name,
the ISBN would be helpful.
Clyde Spencer

"Kevin Cunningham" <sms...@xxxxxxxxxxxxxx> wrote in message

news:a0a888ea-6a8e-4f20-b0b9-bf9a1f591e5f@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jan 13, 7:43 pm, Richard J Kinch <ki...@xxxxxxxxxxx> wrote:





Kevin Cunningham writes:
If you haven't read my book, your one of the very, very few who
haven't. My book influenced the major makers among others.

Sorry, what was that ISBN again? Amazon and abebooks.com haven't any books
by your name regarding optics or microscopy.

I'm still trying to recover from your assertion last year that eyepiece
field numbers are "never given in mm".

Go to NIH, Armed Forces Institute of Pathology, Harvard, Yale,
Stanford, UG-A, U-I, Intel, Timken, Mueller, etc, etc, etc and see how
many use eyepieces made by some one other than the manufacturer.

Richard, you have done a lot for the amateur but your views are your
views, they are not the views of manufacturers or professionals.

That's odd, because if your names above represent "professionals",
whatever
their habits regarding eyepieces, most of them are actual paying customers
of my optical engineering designs.

If you run an "optical engineering" firm, God help us all.

Field number is never given in mm.  Field number has nothing to do
with mm.  It works if you are using mm or peanuts.- Hide quoted text -

- Show quoted text -

Hi All,

Kevin, sorry to say this, but I think you are still living in the
past ... field numbers for most optical eyepieces today are indeed
given in mm (although one may argue that they should represent the
diameter of the Airy disk projected by the eyepiece) - the Olympus
website at http://www.olympus.co.jp/en/insg/ind-micro/terms/field_number.cfm
(I've noticed you've quoted Olympus as a reference resource and I too
personally regard it as authentic enough for information validation)
clearly defines "The field number (F.N.) is referred to as the
diaphragm size of eyepiece in mm unit which defines the image area of
specimen."

Also, yes the eyepiece's core function is still to magnify a virtual
image, although one may cite differences in optical elements in
telescopic vs microscopic eyepieces which may result in a compensation/
reduction in image quality (due to the unique coatings, etc in each
manufacturer's eyepiece which compensate optimally for the spherical
and chromatic aberrations present in each optical system due to the
different objectives used, etc), tracing the optical path in a
telescope and a compound optical light microscope clearly reveals the
image projection and light path in a telescope and a microscope to be
similar (though not congruent), thereby allowing interchangeability of
both microscope and telescope eyepieces.

All the Best,
Shiraz
.

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