Askar 151PHQ Quadruplet APO Astrograph

Askar 151PHQ Quadruplet APO Astrograph

This long focal ratio flatfield apochromat support 60 mm image circle and does not need calculations for backfocus. If the image is sharp, the field is flat.

  • 151 mm aperture, 1057 mm focal length, f/7
  • Self flattening design with two ED elements
  • 3.4" dual speed focuser
  • 2" and 1.25" receptacles, M86 thread
  • Retractable dew shield
  • Losmandy style dovetail bar
  • Handle
  • Vixen type finder base
Manufacturer : Sharpstar
SKU : TSO-AS151PHQ
Price: 5317.00 € incl tax 19% (Germany)
Estimated delivery time : 4-8 weeks
Product description
151PHQ is a long-focal-ratio, flatfield astrograph launched after 130PHQ. Instead of buying extra flatteners, calculating the backfocus of flattener or making tedious connection to match the distance, astrophotographers can simply equip it with any possible imaging devices, make the target stay at the focus, and then the whole optical system is perfect for imaging.

High quality imaging optics:
151PHQ has an aperture 21 mm larger than 130PHQ. The triplet lens with two ED glasses offers excellent control of chromatic and other aberrations. With its self-flattening design, due to the fourth optical element, 151PHQ offers strong advantages in astronomical shooting. It supports a medium frame (for example ASI461MM Pro) 60 mm image circle, has a fine spot diagram with tiny distortion of the peripheral stars, and its central RMS radius is less than 2 microns.

The Askar 151PHQ is a true all-rounder - it is designed as telescope for almost all applications:
Extended objects can be imaged. But equally, fine details of objects can be brought out when cameras with high resolution are used.
The use of different cameras with different flange focal lengths is no problem. Simply focus and you are always at the correct distance. The adapter battle is eliminated.
The focuser has large travel, so you can find the focus without problems.
The working distance or backfocus from the 2" receptacle is long enough to use 2" star diagonals. This turns the flatfield apo into a wide field telescope or even a planetary telescope, depending on the eyepiece used.

Practical features:
151PHQ comes with a telescopic lens hood, a high quality CNC machined and painted tube and attractive decorative parts. The 3.4" rigid focuser comes with 2" and 1.25" adapters and a finder base. When used with the optional 3" 0.7 x flat field reducer, the telescope can reach a focal ratio of approx. f/4.9 and a focal length of approx. 740 mm, effectively reducing exposure time. The multifunctional handle comes with a central slot for attaching an M6 screw with an M6 screw hole. Standard Losmandy dovetail plate, together with sturdy double tube ring, is perfectly suited for viewing and shooting.

The photographic 3.4" rack&pinion focuser deserves a special note:
The CNC focuser is optimized for photography and can handle a load of up to 8 kg. The adjustment range is very generous. The focusing is done via rack and pinion which is decoupled from the bearing of the draw tube. This guarantees fine and precise adjustment even at maximum load. In addition to the 1.25" and 2" receptacle, the focuser also offers an M86 thread for screw adaptations.

Scope of Delivery:
  • 151PHQ OTA with adapter M86 to 2"
  • Adapter 2" to 1.25"
  • Pair of tube rings
  • Handle
  • Losmandy style 300 mm dovetail bar
  • User manual
  • Transport case
Products specifications
Focal ratio f/7
Connection to eyepiece 2" / 1.25"
Type of telescope 3 elements glass with airspace
Lens 4-Element ED Corrector
Focuser 3.4" dual-speed rack and pinion, max. load 8 kg
Aperture 151mm
Focal length 1057mm
Dewcap diameter 180mm
Tube diameter / Length 163mm / 925mm
Backfokus 95mm
Total weight 13.4 Kg