Askar 151PHQ Quadruplet Refracting Astrograph
Askar 151 PHQ Quadruplet Air-spaced APO Refractor
The Askar 151PHQ features a flatfield astrograph newly launched after 130PHQ and one of the biggest refractors Askar has to offer! This quadruplet air-spaced APO refractor simplifies your set up Instead of needing extra flatteners, calculating the back focus of the flattener, or making a tedious connection to match the distance, astrophotographers can attach any possible imaging devices and make your targets stay in focus. This capability makes the whole optical system perfect for imaging.
The 151PHQ refractor from Askar has a focal ratio of f/7 and a focal length of 1057mm. With an aperture of 151mm, this OTA is the largest of the Askar refractors so far. The quadruplet lens is designed with two ED glasses, offering excellent chromatic and other aberration control. With the self-flattening design, the 151PHQ offers strong advantages in astronomical imaging. The 151PHQ APO refractor supports a medium frame, 60mm image circle. It also has a fine spot diagram with tiny distortion of the peripheral stars, and its central RMS radius is less than 2 microns.
A Versatile Refractor Perfect for Astrophotography and Viewing!
The 151PHQ refractor from Askar includes many accessories that make it incredibly well-suited for both observation and astrophotography. It also comes with two modes, depending on the accessories attached, that will suit which type of set up you would like. Learn more about the accessories and technical details of both the observing and imaging modes by reading below.
Included Items
The 151PHQ comes with a telescopic lens hood, a high-quality CNC machined and painted tube, and an aesthetically pleasing design. The 3.4" Rack & Pinion focuser comes with a 2" and 1.25" adapter, M68/M54/M48 photographic adapters, a 360° rotator, and a finder base. When used with the 3" 0.7x flat field reducer (sold separately), the telescope can reach a focal ratio of f/4.9 and a focal length of 740mm, effectively reducing exposure time. The included handle is multifunctional and comes with a central slot for attaching an M6 screw with an M6 screw hole. To complete the package, Askar has included a standard 300mm Losmandy dovetail plate and a sturdy double tube ring, making this telescope perfectly suited for both viewing and shooting.
Two Modes
The Askar 151PHQ comes with two modes: imaging mode and observing mode. When in imaging mode, the maximum accessory connection with the focuser fully retreated is 78 mm from the base of the M48x0.75 male thread. The length in this mode is 976.8mm with the dew shield contracted and 1,164.3mm with the dew shield extended fully. When in observing mode, the maximum accessory connection with the focuser fully retreated is 119mm from the end of the 1.25" eyepiece holder. The length in observing mode is 930.3mm with the dew shield contracted and 1,117.8mm with the dew shield extended.