This item is a 1957 Bausch & Lomb StereoZoom 4 stereo microscope, serial number EN 306805-MJ, on a boom stand with a homemade bottom board, with lots of extras. It has a Bausch & Lomb binocular head with Bausch & Lomb 10x Wide Field (WF) stereo eyepieces and a zoom magnification setting from 0.7 to 3.0x. The lenses look good to me and I was able to focus and utilize the different magnification settings, and easily use the boom control.
The focus plane is above the base (my Dad was a recording engineer and used it to examine the record master grooves in the day and was mounted on the cutter). Cosmetically, it is showing it's age, meaning there are scuffs, scratches, and smudges on the exterior (see pictures for details). I also did the millimeter measurements but it isnt always obvious to me where the rim ends, etc so they may be off by a millimeter or two. They were stored together in a box with the microscope but it is possible some of the items are really for cameras only.
So please check out the pictures for additional identification purposes (and let me know if you see something I identified incorrectly). The additional items are as follows. 2 Kalt T-Mount Microscope Adapters, one of which is New Old Stock in box. 1 Adapter that fits top of T-Mount Microscope Adaper using a 44mm thread.
1 1.75 inch EFL Symmetrical Jaegers Lens with 32mm threads. 2 21mm reticle with retaining clips.1 37mm knurled outside, 25mm internal with spring adapter with knob. 1 37mm knurled outside, 25mm threaded internal adapter. 1 25mm outside threaded, 19mm inside threaded with retaining ring. Unlike a binocular microscope, which feeds one image to both eyes, a stereo microscope gives each eye its own view, so that you see in three dimensions. One of the most popular stereo microscopes of all time is the Bausch & Lomb StereoZoom 4 (SZ4), later taken over by Leica and also marketed under the Cambridge Instruments name.
It was introduced in 1959 and made until 2000. The StereoZoom 4 gives an erect image, provides an ample working distance, and incorporates a zoom system in a self-contained optical "pod" which could be put on many different bases and mounts. The most common variety of "pod" zooms from 0.7× to 3×, although 13× and fixed-power versions exist. 1 shows how it attaches to a stand; two clips swing out and you can simply lift it off. The eyepieces are normally 10×, non-compensating, with 23.2-mm tubes (the standard size on older microscopes).The eyepieces originally marketed with this microscope are an excellent match to it. Inexpensive non-compensating eyepieces from other vendors also work well. For low-power examination of hand-held specimens, you don't actually need a focusing mechanism; just support the "pod" far enough above the table and hold the specimen underneath it. You can use a desk lamp for illumination, but Bausch & Lomb and Leica made a special Nicholas (collimated-beam) illuminator that could be used separately or inserted into a hole in the back of the "pod" Fig.
There is also a transillumination base for the StereoZoom 4 that accepts that same illuminator as its light source. The Nicholas illuminator has one quirk: dust on the innermost lens surface, near the bulb, is projected sharply into the spot of light. Accordingly, a standard maintenance procedure is to open it up and swab the dust out. The item "Bausch & Lomb StereoZoom 4 Microscope Pod on Boom Stand wth Camera Adapters, etc" is in sale since Thursday, January 30, 2020.
This item is in the category "Business & Industrial\Healthcare, Lab & Dental\Medical & Lab Equipment, Devices\Microscopes". The seller is "helffric" and is located in Poughkeepsie, New York. This item can be shipped to United States.