SharpStar 150 mm f/2.8 Hyperbolic Newtonian Astrograph Reflector - 15028HNT-AL

SharpStar f/2.8 Hyperbolic Newtonian Astrograph Reflector

• SharpStar 150 mm f/2.8 Newtonian Astrograph
• Ideal for use with both imaging and observation
  
• 44 mm image circle
• All aluminum OTA
• 2.5" heavy-duty barrel rack & pinion focuser
• 0.77 arcsecond resolution
• 12.7 limiting visual magnitude
• 5.95 kg gross weight with tube ring, handle, and dovetail plate
• Includes tube rings, dew cap, handle, and dovetail mounting plate

This SharpStar f/2.8 Hyperbolic Mirror Newtonian Astrograph Reflector is a perfect addition to your optical equipment if you want to do astro-imaging with a fine quality, very fast Astrograph, and also want to do observing with a high quality Newtonian Reflector with a wide field of view and low-aberration images. This Astrograph from SharpStar is a newer design which fills a previously existing gap in the astronomy market place.

Compared with the conventional parabolic mirrors, the process of producing, manufacturing and testing hyperbolic mirrors is much more intricate. The Hyperbolic Mirror Newtonian Astrograph Reflector comes second to none considering its rather fast focal ratio. The telescope tube is made of aluminum. Both primary and secondary mirrors, with a minor axis of 70mm, have an enhanced aluminum coating, thus keeping a reflectivity as high as 97%. The secondary mirror holder is CNC machined and is designed to insure textbook diffraction spikes and no alignment issues.

A three-element corrector lens assembly is located in the focuser, enabling the whole optical system to better achieve full-frame imaging and control the vignette. The standard 55 mm back-focus and M48×0.75 thread tapped on the focuser also prepare the telescope for most stock imaging devices and make sure the item in the objective lens can be perfectly projected onto the focal plane.

The Sharpstar 15028HNT-AL uses a large, rigid dual-speed rack & pinion focuser.  It is compatible with most motorized focusers and has a weight capacity of up to 3kg.  The front of the focuser has a 360º camera rotator as well as the aforementioned built-in triplet corrector. Remember that the focuser is shipped in the locked position when the telescope is shipped to you.  Just make sure to loosen the locking screws as part of your initial set-up to avoid damaging the focuser.

The delicately pierced handle bar is made from CNC-manufactured solid aluminum, which can be used as a base for the attachment of other accessories. The new design of the telescope handle is an aesthetic and mechanical improvement to satisfy the demands of astronomy enthusiasts.

This f/2.8 Hyperbolic Newtonian Astrograph Reflector from SharpStar is an ideal fast-f/number Astrograph for doing critical astro-imaging work, but is also good for visual observation when a wide field, lower magnification optical system is appropriate. The Hyperbolic mirror design of this Astrograph will delight the most serious of astro-imaging enthusiasts when their images are revealed in the final processing. 

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