The 15028HNT-AL is a hyperbolic Newtonian reflector with a 150mm aperture and a fast F2.8 focal ratio.

15028HNT-AL supports a 44mm full-frame image circle, and the star performance is great.

The primary mirror is made of Pyrex-alike glass PZ33. Its thermal expansion coefficient is smaller than that of ordinary glass. The dielectric multilayer coating gives the primary mirror a highly reflective ability of up to 97%. The diameter of the secondary mirror minor axis is 70mm, enabling sufficient illumination for full-frame imaging. The corrector in the focuser adopts a triplet lens design, one of which is ED glass, enhancing the power in aberration correction.

15028HNT-AL further enhances the structure stability of the optical axis of the primary mirror, and there are three sets of adjustment screws at the bottom of the lens tube for adjusting the angle of the primary mirror.

15028HNT-AL improves the bracket structure of the secondary mirror to make it more stable. The secondary mirror bracket is CNC machined and integrated manufacturing with no misalignment, which ensures beautiful diffraction spikes during astrophotography.

There is a finder base on the side of the lens tube, which provides additional mounting positions for finder scope or other astronomical accessories.

15028HNT-AL ‘s tube ring is sturdy and durable. Enlarged hand screws allow users to open and close the tube ring without additional tools.

15028HNT-AL's focuser is a dual-speed rack-and-pinion large rigid focuser, which ensures a 2cm focusing travel as much as possible within the structural limitations and can be compatible with most motorized focusers. The front of the focuser is designed with a camera rotator which can rotate the focuser as a whole, the focuser has a built-in triplet corrector. The structure of the focuser is very stable and can carry 3kg.

The back focus of 15028HNT-AL is standard 55mm (from the M48 thread).

*The 15028HNT-AL focuser is shipped in a locked condition. Users should be sure to loosen the locking screws before initial use to avoid damage to the part.

Standard Losmandy-style 200mm dovetail plate and 200mm handle bar.

15028HNT-AL is all-metal, with an aluminum lens tube and CNC machined parts.

 

15028HNT
Aperture size	150mm
Focal length	420mm
Focal ratio	f/2.8
Primary mirror type	Hyperbolic reflective mirror
Primary mirror material	PZ33（similar to Pyrex glass）
Corrector	Three-element air-spaced refractive lenses（including one ED glass）
Minor axis of secondary mirror	70mm
Image circle	44mm
Field of view	6 degree
Main tube material	Aluminum
Main tube outer diameter	193mm
Main tube length	443mm
OTA weight	4.8kg
Gross weight（including tube ring and dovetail plate）	6kg
Resolution	0.77 arc second
Limiting visual magnitude	12.7
Back-focus	55mm