Thanks for the appreciation!
Nice, I didn't think about the pupil size... we may solve this issue with a slower OTA? F/20 should match the pupil size...
Yes, imagery quality, the eyepiece will be optimized to have its rays (at the exit pupil) parallel, while the microscope, the rays must converge precisely at the subject - but they don't need to be exactly parallel. That kills my dreams of uber-eyepiece.
The objective/eyepiece I've used, 50x 0.45, the only one I have with enough eye relief - it is one of the last made by B&L! Actually branded Leica-Made in USA, for the B&L Microzoom. Used as it should, on a microscope, it works great. I've disassembled it for cleaning, and it was made with exceedingly high precision and tight fittings; never seen such quality in eyepieces (well, I never wrecked a good eyepiece actually, only cheap ones ).
I never thought to use a microscope objective as loupe- I'll try. I have tried to use eyepieces as loupe, screwing out the barrel. But it is difficult to keep them at the right distance.
And probably no coincidence that microscope objectives provide a relatively uniform ~F/18-ish feed to the microscope eyepiece!
I'm still excited over what you noticed and presented in your topic here. For any imaging system, object and image conjugates cascade through, from physical object to final image, which is then examined with a sensor array or an eyepiece/eye combo. And that same system simultaneously cascades pupil conjugates, from entrance pupil to exit pupil. All of that happening simultaneously, of course, "percolating in the background". An extreme example is complex periscopes, where all the functions are relayed, often several times, to thread the whole package into a skinny tube (e.g. a submarine periscope).
That duality, comprising all optical imaging systems... object/image/pupils/stops. And that's an "advanced topic" covered only later, in detail, in the geometrical optics books and courses. Even among my professional associates... some guys seem to have never fully internalized the duality.
It can be as arcane and philosophically challenging as the "wave-particle duality" of field/particle physics. And the gestalt is the realization that both are operative... together... simultaneously... happily opposite conjugate sets.
Also no coincidence that those object/pupil anti-conjugate pairs cascade through the imaging system, obeying all the way... the Lagrange Invariant, solid angle area product. Which is the étendue, driven by QM and Emmy Noether's Theorem.
So, it all expresses the same insight from the physics of light, not only how light behaves... but how it must behave. Which was/is Emmy's insight. Gestalt!
It all ties together, neatly... as it must. Tom
Etendue or étendue is a property of light in an optical system, which characterizes how "spread out" the light is in area and angle. It corresponds to the beam parameter product in Gaussian beam optics.
an organized whole that is perceived as more than the sum of its parts.
Edited by TOMDEY, 03 December 2020 - 04:32 AM.