MTO 1000mm f10 MC MTO-11CA

The LZOS MC MTO-11CA 1000mm F10 is a mirror reflex lens or catadioptric lens with a Maksutov-Cassegrain optical design.
Mirror lens uses a combination of mirrors and lenses to produce folded optical path, resulting in a compact lens capable of a very long focal length.

It weighs 1.9 Kg, with fixed f10 aperture, the minimum focus distance is 8m, field of view is 2.5° at infinity. The lens equipped with a sliding lens hood. The effective aperture (T-number) of this lens is estimated to be approximately T16 due to the front mirror blocking some light.
MTO 1000mm needs a sturdy tripod to get sharp pictures. It is challenging to use, but knowing its limits, strength and weakness can lead to good results.

MTO stands for “Максутова Теле-Объектив” (Maksutov Tele-objektiv = Maksutov Telelens) or “Менисковый Теле-Объектив” (Meniskoviy Tele-Objektiv = menicus telelens). A – it’s russian mark for lens with interchangeable mount (for example Jupiter 37A).
The Maksutov is a catadioptric optical design that combines a spherical mirror with a meniscus lens. This design was patented by Russian optician Dmitri Dmitrievich Maksutov in 1941. The Maksutov systems are free from chromatism, coma, and in many cases also from astigmatism. LZOS stands for Lytkarino Plant of Optical Glass (Лыткаринский завод оптического стекла), it is an optical company in Lytkarino, in the Moscow Oblast of Russia. MC means multi-coating (МногоСлойное покрытие).

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