This is a nice example of the Bausch & Lomb StereoZoom 4 microscope pod that started it all. All metal construction and uniform smooth black finish means this represents the  second generation  of the instrument. The StereoZoom 4 was introduced in the mid-1950s and remained in production for over 50 years with very little change

This was by far the most popular of the StereoZoom series, with a zoom range of 0.7x to 3x Magnification can be further varied by exchanging the oculars (B&L has eyepiece pairs from 10x to 33x designed for use with the stereo pod), or by threading an auxiliary objective adapter onto the front of the pod. The later are available in various magnifications from 0.3x to 2x, but they alter the working distance of the pod. This yields a magnification range of 2.1x to 180x depending on the combination of oculars and auxiliary lenses selected.

These pods are typically in excellent cosmetic condition and fine optical/mechanical condition. The dust seals beneath the ocular tubes are usually present but often a bit dried out. Alignment is checked, and the zoom mechanism is relubricated to prevent image shift during zooming.

Pod catalog number is 31-26-94. With standard 10x oculars (not included) the field diameter ranges from 28mm at 0.7x to 6.6mm at 3x, with a working distance of 100mm. Instrument remains in focus throughout the zoom range.

To make a complete instrument you need a focusing yoke (included with some of the simpler stand versions), a support stand, and a pair of oculars. Optional needs would include an illumination source. Inquire regarding the availability of complete systems or multiple units.

Location MB 47-2

Photo set 477
***MPN 31-26-94
***OEM Bausch & Lomb (B&L)
***SKU*** DP044