More products from the brand :Sharpstar

Newton Askar 150mm HNT-AL f/2.8 astrograph

Don't miss this exceptional promotion on this wide-field Astrograph

Original price was: CHF 1'799.Current price is: CHF 1'639.

Reference SCOPE-0003

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Easy, free returns

Sharpstar 15028HNT-AL - the f/2.8 hyperbolic astrograph that brings out the light

Designed for high-resolution imaging, the 15028HNT-AL concentrates a 150 mm hyperbolic primary mirror and a triplet corrector integrated into a compact aluminum tube. At f/2.8, it captures as many photons in half the time than an f/4 tube - enough to multiply wide-field projects with complete peace of mind.

For example:

长友气体

Ultra-fast & full-format optics

  • Hyperbolic primary mirror in PZ33 (Pyrex-like) Ø150 mm, reflectivity ≈ 97 % (multi-layer dielectric coating).
  • Focal length 420 mm (f/2.8)a field wide angle of 6°, easily illuminating an image circle of 44 mm (full format).
  • Corrector triplet air-spaced (including 1 ED lens) housed in the eyepiece holder: fine stars and coma eliminated right down to the corners.
  • Secondary Ø70 mm (minor axis) for even illumination on 24×36 sensors.

长友气体

Robust & precise mechanics

  • Tube and CNC parts in all-aluminumreinforced rings with oversized butterfly screws.
  • Lens holder rack-&-pinion 2″ dual-speed (20 mm stroke) + (20 mm stroke) + (20 mm stroke) + (20 mm stroke) 360° rotator integrated, 3 kg capacity.
  • Easy collimation : 3×3 primary adjusting screws + one-piece CNC secondary spider for sharp egrets.
  • Losmandy 200 mm base plate and 200 mm handle included; side-mounted finder base for accessories.

Nomadic but powerful

  • Length : 443mm - Ø : 193 mm - OTA weight : 4.8 kg (6 kg with rings & dovetail).
  • Back-focus 55 mm (from M48 thread): compatible with SLR, hybrid and astro cameras.
  • Visual magnitude limit 12.7 - Theoretical resolution 0.77″.

Key specifications

Parameter Value
Opening 150 mm
Focal length / F-ratio 420 mm - f/2.8
Design Newtonian hyperbolic + triplet corrector (1 ED)
Image circle 44 mm (full format)
Effective field 6 °
Secondary (minor axis) 70 mm
Tube (L × Ø) 443 mm × 193 mm
Mass OTA 4.8 kg (6 kg overall)
Lens holder Rack-&-pinion 2″ dual-speed + 360° rotator
Back-focus 55 mm (from M48×0.75)
Resolution / Mag. limit 0.77″ - 12.7 mag

With the Sharpstar 15028HNT-ALGo light speed: immortalize diffuse nebulae, isolated galaxies or complex stellar fields in record time.

 

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