Page 68 - Lenses

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4-1/8" DIA NEC TV PROJECTION LENS

Unused beauty. NEC TV projection lens. Designed for use in big screen TV projection systems. Front clear lens diameter of 4-1/8", rear clear lens diameter of 3 7/8", barrel length of 6 1/4" x 5 1/8" diameter (front) and 4 5/8" diameter (rear), multi-element (appears to be all glass as the lens assembly weighs 5 pounds), with coated optics. Black plastic barrel with 5/8" wide

notched front grip ring and 5 1/8" diameter x 3/4" wide barrel-center threaded mount. The lens projects a large image in a short distance. Great for education projects such as slide or transparency projector, etc in addi- tion to TV projection. Designed to be nearly in contact with subject sur- face. The number 542 is stamped on the barrel and may be the NEC model number. We haven't taken one apart, but it looks like different types of large diameter optical elements. Includes black plastic front and rear lens covers.

L3294 $15.00

COBURN SUPREMACY 71MM DIAM. SEMI-FINISHED HARD RESIN LENSES

Military surplus plastic lens blanks, manufactured by Coburn Optical Industries, Inc. of Muskogee OK. Made from CR39 resin, these Accommodator model concave lenses are impact-resistant (not shatterproof or unbreakable), are 71mm diameter and feature a 22mm diameter low-segment slight magnification zone (shown in the listing picture). Ground 8mm thick edge; approx-

imately 15mm depth. Unused stock, in the original wrapping and boxes. Price is for a set of 2.

L3309 $4.50

B&L STEREO RHOMBOID ARM

Made by Bausch & Lomb for their Model 240 Aerial Photo Interpretation Zoom Stereoscope. Catalog #53-70-28. Our understanding is that the instrument has two of these arms and optional stereo lenses that fit on the end (we have some). It's quite an interesting piece with lots of optics in it. If you look straight thru the top section, you get a clear upside down image. The top section rotates,

and the image rotates as well. If you turn it 180 degrees, the image becomes right side up and correct left to right. There is also a control that moves one of the lens assemblies and appears to zoom the image a little. Inside is a Right Angle Prism with 1 inch square faces. Also an elliptical front surface mirror, 16mm x 22mm, two cemented doublets, and 5 single element lenses. Clearly an expensive piece. If you have the Model 240 instrument, then you need two of these as spares. If not, then what a great optical piece to experiment with.

L3313 $22.50

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Tasco 1575 DIA NEC TV Projection Lens, Coburn Supremacy 71MM DIAM. SEMI-FINISHED Hard Resin Lenses, Stereo Rhomboid ARM
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1575 specifications

The Tasco 1575 is a high-quality spotting scope designed for outdoor enthusiasts, birdwatchers, and hunters who seek superior optics and performance. This versatile instrument is engineered with advanced technologies and precision manufacturing that make it a standout choice in the field of optical equipment.

One of the main features of the Tasco 1575 is its powerful 15-75x magnification capability. This wide range allows users to zoom in on distant subjects with remarkable clarity, making it ideal for observing wildlife or surveying landscapes. The scope is equipped with a superior quality objective lens, which not only enhances light transmission but also offers exceptional brightness and color fidelity. This ensures that users can enjoy crisp, detailed images even in low-light conditions.

The Tasco 1575 is also designed with a durable and robust construction. Its waterproof and fog-proof design makes it suitable for use in various weather conditions, allowing users to focus solely on their observations without worrying about equipment failure. The rubberized exterior provides a secure grip and added protection against impacts, ensuring that the scope can withstand the rigors of outdoor adventures.

In terms of portability, the Tasco 1575 is relatively lightweight, making it easy to carry during long excursions. Additionally, it comes with a comfortable tripod, providing stability for prolonged viewing sessions. This feature is particularly beneficial for spotting distant details that require steady observation.

One of the key technologies integrated into the Tasco 1575 is its multi-coated optics. This technology minimizes glare and maximizes light transmission, resulting in sharp images with minimal distortion. The eyepiece features a comfortable design that accommodates users wearing glasses, ensuring a pleasant viewing experience for all.

Overall, the Tasco 1575 combines high magnification with durable construction and advanced optics, making it an excellent choice for users seeking a reliable spotting scope for various outdoor applications. Whether for leisurely birdwatching, hunting expeditions, or nature observation, the Tasco 1575 stands out as an exceptional tool that meets the demands of avid outdoor enthusiasts. Its blend of features, technologies, and characteristics ensures that users can capture the beauty of the natural world with confidence and clarity.
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