Askar 151PHQ - 151 mm f/7.7 Quadruplet Air Spaced Astrograph - 151PHQ

The Askar 151PHQ is a long focal ratio, flat-field astrograph. Instead of buying an extra flattener that requires calculating the back focus and making a tedious connection to match the distance, astrophotographers can simply attach their camera, achieve focus, and start shooting! 

The 151PHQ quad refractor has a focal ratio of f/7 and a focal length of 1057mm. The aperture is 151mm...one of the largest refractor telescopes Askar makes.

The quadruplet lens, two of which are ED elements, offers excellent control of chromatic and other aberrations. With its self-flattening design, the 151PHQ offers strong advantages for astrophotographers. 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. 

The Askar 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, a 360° rotator and a finder base. When used with the optional 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 while widening the field of view. 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.