The lens from the MBS-2 microscope, its adaptation for a SLR camera. Note from the reader Radozhiva

This article is about the lens from the MBS-2 microscope and its adaptation for a SLR camera specifically for Radozhiva prepared reader with the nickname Iskander.

Lens from the MBS-2 microscope

Lens from the MBS-2 microscope

This lens is mounted on Soviet MBS microscopes manufactured by the Lytkarinsky Optical Glass Plant (LZOS). Detailed description, optical design of these microscopes here.

Lens Specifications:
Optical design: 4 lenses in 2 groups, view
Focal Length: 80mm
Front lens working diameter: 36 mm
Relative Hole: 1: 2,2
Landing Diameter: 46 mm
Working segment: 64 mm in the standard assembly.

To use it as a photographic lens, a rearrangement of lens groups is required (more on that below), as a result of which the flange distance is reduced to 50 mm, this is enough to install it on most SLR, and even more so, mirrorless cameras. I find it difficult to determine the type of this optical scheme, if you know - tell me in the comments.

As we can see, the scheme is not quite familiar, groups 1 and 2 are located with concave surfaces to the object, the lens looks upside down. This is due to the peculiarity of the operation of micro-lenses - the object is located at a small distance comparable to the focal length, the lens forms a parallel (or almost parallel) beam of light, which then falls into the prism of the bifurcation, then - on the "Galilean elements", which are small telescopes of the Galilean system, and only then through prisms gets into the eyepieces. In this, it resembles the work of a focusing lens of a flashlight or spotlight.

The first sighting images showed an image with strong spherical aberrations, very reminiscent of a picture monocle.

Shot on MBS-2

Shot on MBS-2

Shot on MBS-2

Shot on MBS-2

It was a strong-willed decision to play with rearranging the lenses in different combinations, first of all - turning the entire lens block 180 degrees.

The lens is easy to disassemble, just unscrew the threaded ring on the back of the lens. It consists of two glues that look like achromats, with a spacer ring between them. There is also a protective glass in front of the front lens. The lateral surfaces of the lenses are not blackened. Enlightenment is violet, on a gleam of a lens slightly yellow.



I blackened the lateral surfaces of the lenses, the ends and the inner surfaces of the spacer and threaded rings with black matte paint, assembled the lens on the contrary.

I made the case with the focusing device from plastic plumbing pipes of 50 mm caliber. The inner diameter of the tube miraculously coincided with the mounting diameter of the barrel, as well as the outer diameter of the M39 macro ring, which in my case plays the role of a shank for attaching to a Canon EF mount adapter with a chip. In the outer tube, I made a spiral cut, in which the screw moves when focusing, screwed into the inner movable tube. Focusing stroke from infinity to MDF is 14 mm, the tube makes half a turn. Also, a hood is glued to the movable tube. The design can be understood from the photos:

A lens with an inverted lens block (both groups with bulges forward, group 2 in front) gives a low-contrast picture with a pronounced curvature of the field, in the center of the frame, the sharpness is acceptable, but when shooting through JVI often misses, non-programmable "dandelion" is lying both in focus and in exposure (does not contain, therefore it is necessary to introduce exposure compensation). Chromatism is also noticeable. I corrected some photos in galleries by simple auto-correction in Photoshop

GALLERY 1 examples with inverted lens block

With all the other possible options for rearranging the lenses, the picture resembles a monoclean one with strong spherical aberrations.

GALLERY 2 examples in standard factory assembly

You will find more reviews from readers of Radozhiva here.

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Comments: 15, on the topic: Lens from the MBS-2 microscope, its adaptation for SLR cameras. Note from the reader Radozhiva

  • Air force

    Um. Cool of course. Iskander, are you out of curiosity?

    • Iskander

      Yes, I thought that a microscope lens should give out simply unimaginable resolution, especially since it is school and not amateur, but really professional, for research in metallurgy, medicine, biology.
      Besides, I didn’t hear that this got into my head :-)

      • Iskander

        * not school *

        • Rodion

          The lens is designed for a large field and small magnifications. MBS image quality is not very.

  • Pavel Gorbunov

    For the works, of course, respect and respect, but vague doubts torment me that the usual monocle gives a picture that is still better.

  • Rodion

    This is an achromat in essence. Try each splice separately - it seems that I published a review of a lens similar to MBS bonding. A very interesting picture.

    • Iskander

      Yes, I read your review. And he experimented with achromat from the telescope×50/comment-page-1/
      By the way, Rodion, we had a dispute over the correct installation of projection lenses (from photo magnifiers and projectors). I admit, I was wrong. In practice, I was convinced that the direction of the rays does not matter, the angle of incidence (convergence) of these rays is important. That is, in the case of the I-96U or F-92, the matrix should be located in the same place as the film, despite the backward passage of light. Since these lenses are calculated exactly at these angles.

      • Rodion

        It seems to me that it makes sense to experiment with gluing this lens separately. They are most likely not pure achromats, but mutually compensated - residual aberrations of each gluing can be interesting. Also, instead of flipping the stitches, it's better to flip the entire lens, I think.

        • Iskander

          Rodion, gallery 1 is made with an inverted lens, without mutual reversal of gluings. All other options for rearranging glues give a picture as in gallery 2, while the working segment changes. I did not experience gluing separately; I have to lengthen the pipe or use the macro rings. since the segment will be even larger.

  • Pawel

    Played and throw it out)

  • Alexander

    Quite a cute monocle. And MBS-2 is a wonderful thing if used for its intended purpose. This is, rather, not even a microscope, but a powerful binocular magnifier with a bunch of opportunities for observation and (yes) photography. To its "younger brother" MBS-10 there is a photo attachment with a digital matrix, and for MBS-2 there is an adapter for installing "Zenith". And he gives a stereo pair! Correspondingly, Canon gets up successfully through a regular adapter (and what else do you want). And there are also various point and volumetric light sources, tables for shooting in transmission and in reflected light, etc. In no case should you throw it away, if anything - welcome to the world of micro photography!

    • Iskander

      I got the microscope disassembled, without a table and an illuminator, with broken supporting parts of the tripod. But it turned out to be a lot of goodies: I still use the massive base as a tripod for home (weighs more than 10 kg, you can't really pull it), I used the eyepiece tubes and an eyepiece with a crosshair and a reticle as a finder and an optical sight, interchangeable eyepieces were perfect as additional to the telescope to increase its magnification (according to the recipe of the magazine "Science and Life"). And the lens was restless. So there was a use for it.

  • Nicholas

    An interesting article, but of course “Monsieur knows a lot about perversions” :)

    • Air force

      Monsieur would be at the Novosibirsk Instrument-Making Plant, which is now Schwabe

  • zengarden

    The image somewhat resembled CCTV lenses.

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