Askar 151PHQ Quadruplet Refractive Astrograph (151PHQ)

All-Star Telescope Canada Verified independent store

→

151PHQ is a long-focal-ratio, flatfield astrograph newly launched after 130PHQ and also the biggest refractor of Sharpstar products till now. Instead of buying extra flatteners, ca lculating the backfocus 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. Specifications Aperture 151mm Focal Length 1057mm Focal Ratio f/7 Objective Type 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 M48×0.75 male thread) Maximum accessory connection (with the focuser fully retreated):Observing Mode 119mm （from the end of1.25" eyepiece holder) Overall 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) Net Weight 11kg Gross Weight 13kg Rear-end thread type M86×1-M68×1 M68×1-M54×0.75 M54×0.75-M54×0.75 M54×0.75-M48×0.75（built-in M48×0.75 filter thread) Four-piece photographic adapter M48×0.75 Show more