Maksutov / Schmidt Cassegrain / ACF / Klevzov / RC Telescopes:

Takahashi Mewlon-300CRS - an uncompromising observatory device, include tube rings The Mewlon-300CRS is a high-end universal instrument for deep-sky photography as well as for high-resolution lunar and planetary observation. A modern Cassegrain, with fully corrected optics, completely remote controllable ex works via Ascom! Fully corrected, flat field of view, no coma The optical principle is a modified Dall-Kirkham, this is a Cassegrain modification with an ellipsoidal primary mirror and a spherical secondary mirror. The primary mirror has a focal ratio of 3, the secondary mirror a magnification factor of 4, which results in a longer focal length. However, the CRS devices have a corrector in the aperture tube with 3 lenses in 3 groups (1 lens made of ED glass) and very large lens spacing, which reduces the focal length to f/9.9. This corrector completely eliminates the coma error from the system without impairing the image on the optical axis. In addition, the field of view is flattened, at the edge of a 35mm diameter image circle the spots are no larger than 15 microns, a Mewlon CRS outperforms a conventional Ritchey-Chrétien telescope. Optical perfection - mirror with λ/20 PV. As usual with Takahashi, the optical surfaces are of exceptional quality. The Mewlon devices have mirrors with an accuracy of at least lambda/20 peak to valley, the carrier material is Pyrex. They have a high degree of reflection and the lenses of the corrector are, of course, multi-coated. In combination with the perfect stray light suppression in the tube, these devices deliver extremely high-contrast images. They are clearly superior to a mass-produced (Schmidt) Cassegrain, and observers who have already worked with a Mewlon will appreciate the high, almost apo-like image quality. Motorized focusing, controllable via Ascom With the Mewlon-300, the primary mirror is permanently installed in the tube, which completely eliminates any shifting problems. Focusing is motorized via the secondary mirror, a control box is supplied. However, this focusing can be controlled via computer (USB) and is ASCOM-compatible; autofocus, for example, can also be used via FocusMax or MaxImDL. The primary and secondary mirrors are fully adjustable, the primary mirror can also be removed relatively easily for cleaning. Automatic fan control. Three vibration-free fans are installed in the rear wall for faster cooling of the primary mirror. They can also be controlled via the computer, making the M-300CRS a fully remote-controllable telescope! A total of three temperature sensors are installed, one on the primary mirror, one in the tube and one on the outside. The fans are controlled automatically; when the temperature of the primary mirror has adjusted to the ambient temperature, they switch off. In addition, side panels can be removed from the rear of the Mewlon-300, allowing the mirror to cool down even faster. Technical data: Aperture: 300mm, Focal length: 2960mm, Aperture: f/9.9, secondary mirror: 88mm, Focal length with reducer: 2160mm, Focal length with extender: 4475mm, Tube diameter: 324mm, Tube length: 1045mm, Weight: 27kg, shipping info: Package dimensions : 18 inch x 20 inch x 62 inch ( 460 mm x 510 mm x 1575 mm ) Packing weight 84 Lbs = 38,2 kg Volume shipping weight 74 kg

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Dew Cap heater for C8 etc up to 250 mm

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.

Meade ETX125 with fork mount with finder, diagonal and eyepiece. Cartonsize 61 cm x 38 cm x 30 cm

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.

we have build and very much tested under real sky a high quaity 20" F/8.5 Maksutov Cassegrain ( Rumak Design) , optics made by Santel in Russia, Mechanics made by Matthias Wirth in Germany. The beast is now for sale . It comes with a set of tube clamps, dew cap, 3" Starlight Feather Touch extension, meniscus heater, main mirror vent, 2 maintenance flaps, handles to move tube, and 2 sets of losmandy dovetail holders for large guiding telescopes. The optics are very smooth and have excellent spherical correction. The lens is broadband multi-coated on both sides. The cooling behavior is excellent.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Celestron NexStar 4 telescope without tripod, without access.

Item condition: used Item with possible small cosmetic deffect, but every function works perfect

Wichtiger Hinweis zur Mehrwertsteuer:
Dieses Angebot unterliegt mit Ausnahme der Versandkosten gemäß § 25a UStG der Differenzbesteuerung, weshalb auf den angebotenen Artikel keine Umsatzsteuer erhoben und ausgewiesen wird.