Fast f/2.8 Optical System – A hyperbolic Newtonian reflector with a 150mm aperture and an extremely fast f/2.8 focal ratio, ideal for deep-sky imaging.
Full-Frame Imaging Capability – Supports a 44mm image circle, ensuring excellent star performance across full-frame sensors.
High-Quality Primary Mirror – Made of PZ33 Pyrex-alike glass with a 97% dielectric multilayer reflective coating, reducing thermal expansion and enhancing image quality.
Enhanced Secondary Mirror Structure – Features a 70mm minor-axis secondary mirror for full-frame illumination, with an integrated CNC-machined bracket for added stability and diffraction spike aesthetics.
Advanced Triplet Corrector Lens – Integrated into the focuser with one ED glass element, improving aberration correction and sharpness.
Precision Focuser with Camera Rotator – Dual-speed rack-and-pinion focuser with built-in triplet corrector, supporting up to 3kg payload, and features a rotator for flexible framing.
Robust Mechanical Design – All-metal aluminum lens tube with CNC-machined tube rings, enlarged hand screws, and a Losmandy-style 200mm dovetail plate.
Finder Scope Mounting – Comes with a finder base for additional accessories.
Standard 55mm Back Focus – Optimized for astrophotography, ensuring compatibility with a wide range of imaging setups.
The Sharpstar 15028HNT-AL is an ultra-fast, high-precision astrograph, perfect for astrophotographers seeking superior image quality, efficient light capture, and a robust design for deep-sky imaging.
Specifications
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）
