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Lenses - Page 71

4.5" DIA CONDENSER LENS, 6.5" FL

Crown glass condenser lens. Plano convex. 4.5 inches diameter by 6.5 inches focal length. Unused.

Made in France.

L3381 $6.00

MTD B&L METROGON LENS, 6" FL

Metrogon lenses are a 4 element design with very strong curved meniscus lens elements covering around a 90 degree field. They are used in aerial cameras for very large format film for the preparation of topo- graphic maps and for large format projection sys- tems.The 6 inch focal length lens covers at least a 9" x 9" format at f/6.3. We know this lens has a 6 inch

focal length, but we do not know what the f number is and we don't have the equipment to accurately determine the f ratio or the actual maximum format for this lens. Our understanding is that as the center aperture is made smaller (larger f number), the coverage format becomes larger. We haven't yet taken one apart, so don't know if it will be easy or hard to change the center stop. We did some testing and it looks like this one gives about an 8" x 8" format as is. There is a small screw on top of the assembly that loosens it and the barrel slides out. It's a compact 2" long by 2-1/16" diameter.Metrogon lenses are the most extreme type of symmetrical con- struction. Each side of the lens has two elements which provides correction for color and spherical faults. We are told that the lenses are also com- pletely free of distortion. Made by Bausch & Lomb. Coated optics. Great condition. Front and rear elements are 45mm diameter. Focal length is 152mm. Barrel is 60mm diameter by 50mm long. Mounting 140mm long

by 85mm wide with 4 mounting holes. We don't find these very often these days.

L3392 $28.50

GLASS ASPHERIC LENS, 50MM DIA X 30MM FL

Very strong aspheric curve on one side and plano on the other. Diameter is 50mm and focal length from the plano side is 30mm. Aspherics offer superior aberration correction for light concentration that would normally require several spherical elements. Unused beauties.

L3467 $5.00

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Tasco 1575 manual DIA Condenser LENS, 6.5 FL, MTD B&L Metrogon LENS, 6 FL, Glass Aspheric LENS, 50MM DIA X 30MM FL
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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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