Levenhuk Ra 150C Cassegrain OTA

Levenhuk Ra 150C Cassegrain OTA is a Cassegrain reflector that is perfect for observing deep sky. It features a distinguished design. The primary mirror is paraboloid and the secondary mirror is hyperboloid. Due to this, the transmitted picture has no spherical distortion across the entire field of view up to the maximum magnification. This Optical Tube Assembly (OTA) will be appealing to demanding and experienced users.

The optics are made of quartz glass with an aluminum and silicon dioxide coating. The optical system has a reflectivity index of 92~96%. The dual-speed Crayford focuser has no backlash, so that it enables precise focus adjustments. The optical tube is made of steel, inside there is a high-quality blackening, and on the outside, there are two mounts: for the holder and for mount installation (dovetail plate). Levenhuk Ra 150C Cassegrain OTA is compatible with almost all of the modern mounts.

Please note: Mount, tripod, finder, and eyepieces are not included.

Features:

Reflector with a paraboloid and hyperboloid mirrors

Aluminum and silicon dioxide coating with a reflectivity index of 92~96%

Full absence of spherical aberration

Good correction of astigmatism and field curvature

Dual-speed Crayford focuser, precise and fast adjustment of sharpness

8 internal knife-edge baffles

Drawtube travel: 41mm (laser-engraved millimeter scale)

Backfocus distance: 157.2mm (from end of 2" focuser collar)

The kit includes:

• Telescope optical tube
• Finder scope base
• Dovetail plate
• 2" Extension ring
• 1" Extension ring
• Dust cover
• User manual and lifetime warranty

Specifications

• Product ID 77654
• Brand Levenhuk, Inc., USA
• Warranty, years lifetime
• EAN 5905555002590
• Package size (LxWxH), cm 66x33x30
• Shipping Weight, kg 8.16
• Optical design reflector
• Optical scheme Cassegrain
• Optics material quartz
• Optics coating aluminum and silicon dioxide
• Primary mirror diameter (aperture), mm 153
• Secondary mirror diameter, mm 50
• Secondary mirror obstruction, mm 58
• Lens (mirror) shape primary: paraboloid; secondary: hyperboloid
• Focal length, mm 1836
• Highest practical power, x 306
• Aperture ratio f/12
• Resolution threshold, arcseconds 0.76
• Limiting stellar magnitude 13.6
• Eyepiece barrel diameter, in 1.25/2
• Objective lens obstruction: by area 15
• Objective lens obstruction: by diameter 38
• Focuser 2", Crayford, dual-speed
• Telescope control manual
• Operating temperature range,°C -5...+35
• Optical tube mounting mode dovetail plate
• Dovetail mount ✓
• Optical tube material steel
• User level experienced users, professionals
• Assembly and installation difficulty level easy
• Observed object deep-sky objects