Celestron 200 mm Newtonian with focal ratio 1:5 A universal telescope with much power and comfort The parabolic primary of this 8" Newtonian mirror minimizes spherical aberration to produce a sharper image near the edge of the field of view. This scope is great for intermediate visual observers and beginning astroimagers looking for a large aperture with lots of light-gathering power. As the telescope is meant for users who already have a suitable mount, there is no mount included! The optics An 8" mirror collects a lot of light, increasing the perception of dim celestial objects. The relatively short focal length and the 2" focuser have a positive effect when viewing large objects, as the latter can be seen completely in the large true field of view. Because of the large focal ratio, "hard" nebula filters can be applied when using eyepieces of long focal lenght, resulting in a clearly enhanced contrast. On the other hand, the parabolic primary mirror allows high magnifications - helpful for moon, planets, planetary nebulae ans smaller galaxies. The low obstruction of only 26% gives more contrast, thus having advantages when observing planets. Of course, the fast optics has also advantages in photography, is it reduces the exposure times. The coma, typical for Newtonians, can be eliminated by a coma corrector, achieving high sharpness even in the corners of the image. General Features 8" (200 mm) f/5 optical design with 2" focuser gives excellent wide field views Parabolic primary mirror minimizes spherical aberration to produce a better image Low obstruction gives high contrast Scope of Delivery Telescope Optical Tube Assembly with rings and dovetail bar 9x50 Finderscope 1.25" Eyepiece 20 mm
Skywatcher - Explorer 130PDS Dual-Speed Newton OTA
Item condition: new and original packed
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.
TS-PHOTON 6" F4 Advanced Newtonian Telescope with Metal Tube The PHOTON Newtonian reflector with 154 mm aperture and the aperture ratio f/4 is a fast travel telescope for astrophotography and visual observing. ♦ Aperture 154 mm (6") - focal length 600 mm - focal ratio F4 ♦ High-quality parabolic primary mirror with enhanced reflectivity for a brighter image. ♦ Large secondary mirror for a well-illuminated image with astro and DSLR cameras. ♦ Precise 2" MONORAIL focuser for more stability than with conventional Crayford focusers. ♦ Adjustable primary and secondary mirror cells made of metal, useful collimation aid on the primary mirror. ♦ With only 530 mm length and approx. 5 kg weight, this is an optimal travel telescope which can even be mounted on good photo tripods. ♦ Focus position ready for the TS GPU Superflat Corrector and the TS 2KORRR 0.73x Reducer / Corrector. ♦ Central mark on the primary mirror for easy collimation ♦ Extensive scope of delivery: 8x50 finder, tube rings, 2" extension tube, adapter to 1.25"