The eyepieces are a Nikon PL 2.5x projection lens and a Labomed 10x WF eyepiece.
The camera is a Canon 5D MkII mounted on an infinity corrected Labomed LB-592 microscope.
The two eyepieces are as different in function as night and day.
The Nikon was designed expressly for projecting an image on to a camera
sensor and the Labomed was designed to project an image on to a
human eye.
The setup is the same for both eyepieces and only differ in the fastening
method and length of the extension tubes required to move the camera back far enough to fill the full frame sensor of the 5D.
The total length of the tubes for the Nikon PL 2.5x are 180mm and
the Labomed tubes are 125mm.
The Nikon PL 2.5x lens is big and required the use of a 1.25" telescope adapter to fasten the extension tubes to the photo port.
I do not know what effect the infinity optics of the microscope
have on the length of the extension tubes.
Labomed extension tubes.

Nikon extension tubes

My expectation was to expect a radical difference in the image quality between the eyepieces. In fact I was mildly surprised
at first glance how close they were in quality.
The obvious difference is in the final magnification with
the Labomed having a 10x magnification factor.
Upon a closer look in Adobe Lightroom the only negative issue
came to light. Chromatic Aberration (CA).
Images taken with the Labomed 10x WF show definite purple fringing around the edges with occasional green fringing.
The Nikon PL 2.5x did not show any noticeable artifacts and is a bit sharper.
The following photos compare the two eyepieces with links
to larger views for closer inspection. The composites are JPEG images
from the Postscript output for a Designjet 130nr PS.
In the interest of public safety, the large single images have been
re-sampled to half size from the original Canon 5D RAW files.
The subject is a thin section of Peridotite as viewed through a 2x objective. It was not possible to find the same location on the slide when
I switched eyepieces, but the comparison is still OK.

Labomed Plane Polarized light
Nikon Plane Polarized light

Labomed Crossed Polars
Nikon Crossed Polars

Labomed Crossed Polars, stage rotated 45°
Nikon Crossed Polars, stage rotated 45°
Your comments are welcomed.