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Specification

Source of data

• Manufacturer's technical data.

Manufacturer description

The "МТО-500А" (8,5/550) is a mirror-reflex telephoto lens. The lens elements are chemically coated.

Designed for small-format cameras with a frame size of 24x36 mm. Produced in a barrel for SLR cameras of the "Зенит" type.

The long focal length and good image quality make the lens suitable for outdoor shooting of animals, birds, distant objects, architectural details, etc. The lens is indispensable in cases where the subject is at a very large distance from the photographer, and when photographing it is required to obtain a large-scale image.

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Technical data:

Focal length, mm: 548,5±1,5%.

Relative aperture: 1:8,5.

Angle of view, deg.: 5.

Working distance, mm: with М42Х1 adapter: 45,5±0,5, with М39Х1 adapter: 45,2±0,5.

Light transmission: no less than 0,58.

Resolving power, lin/mm, with the "КН-1" film, no less than: in the center: 35, at the edges: 20.

Focusing limits, m: from 4 to INF.

Filter size: М77Х1.

Typical characteristics of mirror (reflex) lenses

• Catadioptric system consisting of curved mirrors and optical glass;
• Much shorter, lighter and less expensive designs than conventional super telephoto lenses;
• Outstanding correction of chromatic aberrations;
• Since the aperture is fixed, neutral density filters are used to obtain a smaller aperture;
• Doughnut-shaped out-of-focus highlights.

From the editor

The lens was produced by the Lytkarino Optical Glass Plant (USSR).

The lens has two sockets for mounting the lens on a tripod: with 3/8" and 1/4" threads.

The lens was supplied with four 77mm screw-in filters: НС-8 (Neutral), ЖС-10 (UV), ЖЗС-9 (Yellow/Green) and ОС-12 (Orange).

Notes

• "МТО" is an abbreviation for "Максутова ТелеОбъектив", which means "Maksutov's Telephoto lens", or "Менисковый ТелеОбъектив", which means "Meniscus Telephoto lens".
• Dmitry Dmitrievich Maksutov (1896-1964) is a Soviet scientist, optician, corresponding member of the USSR Academy of Sciences (1946). Inventor of the meniscus optical system bearing his name, which is now widely used in telescope construction.
• The lens has an interchangeable mount that is mechanically identical to the T2 interchangeable mount. In the USSR, the following interchangeable mount adapters were produced: "КП-А/42" (T2 - M42x1/45.5), "КП-А/39" (T2 - M39x1/45.2), "КП-А/К" (T2 - Pentax K), "КП-А/Н" (T2 - Nikon F). "КП" is an abbreviation for "Кольцо переходное", which means "Adapter ring".

Lenses with similar focal length