Maksutov 90/1250mm spotting scope

BKM90OTA

Skywatcher
in stock

Maksutov 90/1250mm spotting scope - Black Line

177,00 EUR
incl. 19 % Tax
excl. 6,00 EUR Shipping costs

Description

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Skywatcher Black Diamond Line Mak 90/1250mm - spotting scope version / OTA
... a compact allround instrument for skywatching and terrestrial observations

The compact Maksutov of 90mm aperture is useful for nearly any application in amateur astronomy and nature observation. Being only 25cm long, it fits into air luggage and with his low weight it can be carried by compact mounts or photo tripods.

Observation
If you like spotting wildlife or stars in the sky, the Black-line Maksutov 90mm performes convincingly in nearly all fields. 90mm aperture collect enough light for several hundreds nebulae and galaxies. The image has no colour fringing and a high contrast - well suitable to watch the moon and planets with fine details. Under ideal conditions you can magnify up to nearly 200x.

Photography
The BKM 90 has a direct T-2 connection thread. So you can adapt your SLR camera using the camera specific T2 ring. Also digital compact cameras may be attached. The Black Line Mak is comparable with a good quality telephoto lens of 1250mm focal length and f/13.9.

Technical data:

-- Aperture 90mm / focal length 1250mm
-- Focal ratio f/13.9
-- Limiting stellar magnitude 12,5mag
-- Resolution 1,3"
-- Tube length 25 cm
-- Tube weight 1,4kg
-- Tube diameter 10cm
-- Effortless internal focussing
-- Photo tripod connection bushing
-- 1,25" eyepiece connection
-- Red-dot finder to locate objects

Applications:

-- compact spotting scope for nature observing
-- powerful long focal length telephoto lens for photography. Cameras can be adapted via the T2 standard thread
-- compact travel telescope
-- compact guide scope for astro imaging

... and many other applications

Scope of Delivery:

-- Maksutov Cassegrain with 1,25" connection
-- Red dot finder for easy object location - the red dot locates the target (see image)
-- 1,25" mirror diagonal for upright images and convenient viewing location
-- 1,25" eyepieces Super 20mm and Super 10mm
-- camera tripod adaptation

Practical tips from Teleskop-Service .... The Maksutov Cassegrainian System

A Maksutov Cassegrain offers an image quality near to a classical refractor, while being very compact. The image is much better than using a fast achromatic refractor of the same aperture which suffers colour fringing. A Maksutov Cassegrain as a reflector does not show this fringing.

On the other hand, a Maksutov Cassegrain is relatively "slow", as the focal length is with respect to its aperture quite high. Hence the strength of the instrument is the observation of moon and planets. It is also a good performer for stellar clusters, nebulae and galaxies but it does not offer a particular large field of view. Very extended objects as the Pleyades cannot be seen all at once.

The optical system - see diagram:

Light enters the system through the front end meniscus lens before hitting the spherical primary mirror. The spherical aberration of the primary is corrected by the meniscus lens. So there is a very sharp image on axis and in the field. A further advantage is that the front end lens seals the tube. A sealed tube is less sensitive for temperature changes.

The secondary mirror at the front element reflects the light back through the perforation of the primary, entering the eyepiece located behind the primary mirror. The secondary also increases the effective focal length of the system, comparable to a tele converter in photography.

Focusing:

The system is focused by translation of the primary mirror using a micrometric screw. This type of focusing has strong advantages, as a standard focuser is not necessary and the focusing range is very large. Nearly every part of equipment you can think of will get into focus of this Maksutov telescope.

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