BRESSER Messier AR-90s/500 Optical Tube assembly (Refurbished)

One of the most important obstacles for the exploration of the night sky is the brightening of the night sky by artificial lights, such as streetlights. The night sky is not really dark in the vicinity of towns or cities, which reduces the visibility of objects beyond the solar systems enormously. Depending on the type of the celestial object it is possible to increase the contrast dramatically by blocking the annoying artificial light. The EXPLORE SCIENTIFIC O-III filter uses a characteristic property of the so called emission nebulae. Those objects glow in special colours, the so called emission lines. Those emission lines are linked to chemical elements - in this case oxygen. The EXPLORE SCIENTIFIC O-III nebula filter blocks all other colours (and thereby nearly all of the artificial light) and only the two emission lines of the oxygen can pass the filter. The result is astonishing: suddenly nebulae are visible at locations that were completely empty without filters. In suburban skies for example the veil nebula NGC 6992 is almost not visible with a 200mm telescope. By using this filter you can see the nebula and its structures without problems. A must for every visual observer. The EXPLORE SCIENTIFIC nebula filters come with a individual test certificate - your guarantee to receive a premium filter.FEATURESenables the observation of so called emission nebulaeblocks almost the entire artificial lightonly the two emission lines of ionised oxygen passes the filterWHAT'S INCLUDED1x 2" O-III nebula filter

NEW – now including a high-quality aperture Solar-filter for safe observation of sunspots, eclipses and planet transits. Great telescope for night and solar observation.The best catadioptic design named Maksutov-Cassegrain produces a sharp, crispy and high-contrast image. A perfect telescope for a convenient entry into astronomy.CHARACTERISTICSTelescope for night and solar observation High-quality Maksutov-Cassegrain optics with high focal length and extremely sharp image Ideal for small bright nebulas, globular clusters, the moon, planets Optical design: Maksutov-Cassegrain Maximum recommended magnification: 200x Aperture: 100 mm Focal length: 1400 mm Aperture ratio: f/14 Universal 44 mm Dovetail plate GP (fits LXD75/Great Polaris/EQ5) SCOPE OF DELIVERYMaksutov Optical Tube Assembly 26mm SuperPlössl eyepiece (31.7mm / 1.25") SC Eyepiece adapter (31.7mm / 1.25") Star diagonal mirror Dovetail plate for GP Level Adjustable polar finder scope with optional illumination LED viewfinder Aperture solar filter Rotatable star map Astronomy PC software Stellarium (via download)