The apochromatic ED refracting tubes of the BLACK DIAMOND series from SKYWATCHER represent a range of refracting astronomical telescopes with a fairly well corrected field and with a highly corrected chromatic aberration. Their low dispersion ED optics allow light to refract through the lens so that the light beam does not scatter much (does not open up) and therefore the image definition is greatly increased. SKYWATCHER BLACK DIAMOND refractors are constructed with a two-element air-spaced objective lens. The second objective element is made of the high quality fluorized glass FPL-53 (O'HARA version).
The ED optics of the BLACK DIAMOND refractor telescopes are made of SCHOTT glass. This combines the efforts of two market leaders, Synta as a manufacturer of astronomical telescopes and SCHOTT as the world's leading manufacturer of the highest quality optical glass.
Observing with the Black Diamond ED120
Lucky is the amateur astronomer who is observing a clear night of clear skies and atmospheric stability with a SKYWATCHER Black Diamond ED 120mm.
If you aim at the Moon when it is waxing, and focus on the Apennine region for maximum focus, magnificent details of the surrounding peaks, canyons and countless small craters will be revealed. We could say that this is observing the Moon in HD. The gas giant Jupiter shows its equatorial bands in high definition revealing internal and inter-band boundary details. The large red spot is clearly visible in full contrast to the rest of the Jovian landscape. In the case of deep sky nebulae, the SKYWATCHER BLACK DIAMOND ED 120 allows enhanced definition to be seen in the gaseous extensions of the outermost parts. Globular clusters are presented with all their stars resolved as perfect point stars. This is just the beginning of an incredible journey you can take with the SKYWATCHER BLACK DIAMOND ED120.
High Transmission Metallic Coated Lenses
All lenses exposed to the open air are coated with an anti-reflective coating to ensure maximum light transmission for a 99.5% transmission factor. SKYWATCHER's proprietary Metallic High-Transmission Coatings (MHC) is the most refined anti-reflective coating in its class.
Optical system with baffles
The objective lens cell is designed to reject residual light that is not in focus. The tube itself is designed with internal baffles to ensure maximum contrast by eliminating unwanted light. The inside of the tube is also finished in matte black to prevent internal reflections from reaching the focal plane.
Crayford precision 2" focuser
Focusing can be achieved thanks to the fine, smooth mechanical, backlash-free gearing of the Crayford 2" focuser that is integrated as standard. This precision 2" Crayford is based on a rack and pinion assembly system.
Tube construction material
The optical tube is manufactured from cast aluminum, painted white or black, for the front and rear cells. The tube itself, the cylindrical part is plated in steel finished in gloss black with gold highlights.
Technical Specifications:
Optical Design: ED APO Refractor
Lens Type: FPL-53 O'HARA
Diameter: 120mm
Focal Length: 900mm
Focal Ratio: F/7.5
Maximum useful magnification: 240x
Magnitude limit: 12.3
Resolving power: 0.9"
Finder: 8X50 right angle or 9x50 (subject to availability)
Focusing diameter: 2"
Diagonal prism: 2" 90º Dielectric with 1.25" adapter
Eyepiece: 28mm 2"
Piggyback mount: Yes
Tube weight: 5Kgs
Tube dimensions (diameter x length): 13cm x 92cm
Carrying case weight: 12.2kg
Aluminum case
