This is description of this part:
The lower, narrower spacer ring of the middle lens of the Carl Zeiss Jena GF-Pw 10x (25) microscope eyepiece, used among others in Carl Zeiss Jena Jenamed / Jenaval microscopes and similar ones.
Seen from the top, the Carl Zeiss Jena GF-Pw 10x (25) microscope eyepiece has the following internal structure:
- upper lens assembly in a black brass mount
- upper spacer ring, smooth inside, 7.5 mm wide
- middle lens
- lower spacer ring, threaded inside, 6.5 mm wide
- lower, cemented lens
What I offer here is the lower spacer ring - one of the two, the second one counting from the top - between which the middle lens sits.
Basic data of the lower spacer ring:
Diameter: 31.5 mm
Width: 6.5 mm
Wall thickness: approx. 0.7 mm
Outer surface: smooth
Inner surface: threaded
Material: brass, blackened
The most important thing: this is not a complete microscope eyepiece. This is a service part - a component for repairing the eyepiece.
This spacer ring is not a spare part for a microscope. It is a part for repairing a microscope eyepiece - and that eyepiece can be used in various microscopes, even ones from manufacturers other than Carl Zeiss Jena.
A few microscopes that such an eyepiece can be used with are listed in the "compatibility" section, but that is definitely not a complete list. You can assume that the Carl Zeiss Jena GF-Pw 10x (25) eyepiece can be used with any microscope from any manufacturer whose microscope head has 30 mm eyepiece tubes.
The last photos in the gallery show the Carl Zeiss Jena GF-Pw 10x (25) microscope eyepiece taken apart (taken together, it is a chart of how this eyepiece is built), and with an arrow I point out which ring is meant and where it sits. This makes it possible to identify this component beyond doubt.
Note that even if these spacer rings simply get mixed up on you while servicing this eyepiece, you will know from these photos and from the description of the structure given above which ring goes where.
The order of the rings matters, because it determines the distance between the lenses inside the eyepiece and directly affects the image quality you get.
You can see the upper spacer ring, that is the wider one (7.5 mm wide) with a smooth inside instead of a threaded one, here: https://www.microscopeparts.eu/part/92000.
What is this part needed for?
- if this component has gone missing somewhere after dismantling the eyepiece
- if the ring got bent while being taken out of the eyepiece housing and will not go back in
