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Description of this part for the microscope.

screw also fits microscope cross-stage attachments used in microscopes such as:
- Carl Zeiss Jena Laboval
- Carl Zeiss Jena Eduval

In the photo gallery there are detailed photos of this element together with the dimensions. Additionally, in the last photo an arrow indicates which element is being referred to and where it is located in the microscope head, in order to clearly identify this part.

Description of this part for the microscope.

be attached to a trinocular head or directly to the microscope body, even when there is no trinocular head.

Basic technical parameters of this tube:
Manufacturer: Carl Zeiss Jena
Colour: grey
Tilt angle: none, this is a straight tube
Internal optics: none - not even a deflecting prism
Mounting to the trinocular head or microscope body: ring with a dovetail
Dovetail diameter: 41 mm
Type of connection at the output: empty tube / barrel
Tube diameter at the output: 23.2 mm internal diameter
Length of the barrel / tube: 25 mm
Length adjustment: no - this is not a tube with adjustable height

Since the adapter has an empty barrel with an internal diameter of 23.2 mm on the output side, a projection eyepiece of that diameter can be placed in it, or a so-called "USB eyepiece", that is a digital microscope camera. Adapters between the 23.2 mm barrel and the M42 thread are also widely available, and from the M42 thread you can move on to any other mount: Nikon, Canon, Sony and others.

Such a tube can be mounted directly on the microscope body instead of the head. A dovetail seat with a diameter of 41.0 - 41.5 mm is found, among others, on the microscopes:
- Carl Zeiss Jena
- LOMO
- Meopta
- IOR
- Reichert Biopan
- Olympus CH

It is also often used in microscopes with a slightly larger seat, among others Zeiss West Germany, Leitz Wetzlar, PZO, Will Wetzlar, Hund Wetzlar.

The adapter can equally well be fitted onto trinocular heads, as many of them have a seat prepared for it, among others:
- the output in the trinocular tubes of the Carl Zeiss Jena Jenamed, Jenaval, Jenalumar, Jenatech, Jenavert, Jenapol microscopes
- the LOMO TRN-1 heads (ЛОМО ТРН-1), found in the LOMO Polam microscopes
- some versions of the intermediate photo tubes for the Carl Zeiss Jena Mikroval series microscopes (others require a tube screwed onto a thread)

This is not a "tube for one specific microscope model". A trinocular head can be mounted not only on the microscope it was sold with - it is therefore correct to assume that this is a universal tube, with a 41 mm dovetail on one side and a 23.2 mm barrel on the other.

The "compatibility" section gives an example list of microscopes this tube fits, although it is not a complete list.