Askar 151PHQ Professional f/7 Long Focal Ratio Flat-field Astronomical Telescope 151mm Aperture Refractor

Askar 151PHQ Professional f/7 Long Focal Ratio Flat-field Astronomical Telescope 151mm Aperture Refractor

Description:
- 151PHQ is a long-focal-ratio, flat-field astrograph newly launched after 130PHQ. Instead of buying extra flatteners, calculating the back-focus of the flattener, or making a 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.

- 151PHQ has a focal ratio of f/7 and a focal length of 1057mm. The aperture is 151mm, which is the largest of Askar refractors so far. The quadruplet lens with two ED glasses offers excellent control of chromatic and other aberrations. With its self-flattening design, 151PHQ offers strong advantages in the astronomical shooting. It supports a medium frame 60mm image circle, has a fine spot diagram with tiny distortion of the peripheral stars, and its central RMS radius is less than 2 microns.

- 151PHQ comes with a telescopic lens hood, a high-quality CNC machined and painted tube, and attractive decorative parts. The 3.4" R&P focuser comes with M68/M54/M48 adapters, 360°rotator and a finder base. When used with the 3" 0.7 x flat field reducer, the telescope can reach a focal ratio of f/4.9 and a focal length of 740mm, effectively reducing exposure time. The multifunctional handle comes with a central slot for attaching an M6 screw with an M6 screw hole. A standard 300mm Losmandy dovetail plate, together with a sturdy double tube ring, is perfectly suited for viewing and shooting.

Specification:
- Aperture size: 151mm
- Focal length: 1057mm
- Focal ratio: f/7
- Objective lens: Quadruplet air-spaced APO (including two ED glass)
- Image circle: 60mm
- Maximum accessory connection (with the focuser fully retreated):
  Imaging mode: 78mm (from the base of M48x0.75 male thread)
  Observing mode: 119mm (from the end of 1.25" eyepiece holder)
- Total length:
  Observing mode: 930.3mm (with the dew shield contracted); 1117.8mm (with the dew shield fully stretched)
  Imaging mode: 976.8mm (with the dew shield contracted); 1164.3mm (with the dew shield fully stretched)
- OTA weight: 11.6kg
- Total weight (including tube ring & dovetail plate): 13.7kg
- Rear-end thread type:
  M86 x 1 - M68 x 1    
  M68 x 1 - M54 x 0.75    
  M54 x 0.75 - M54 x 0.75 
  M54 x 0.75 - M48 x 0.75 (built-in M48 x 0.75 filter thread)
- Four-piece photographic end adapter: M48 x 0.75

Package Included:
- 1 x Telescope
- 1 x Pair of Tube Rings
- 1 x Handle
- 1 x Losmandy 300mm Dovetail Plate
- 1 x Set of Photographic Adapters
- 1 x Aluminum Box
- 1 x User Manual