151PHQ

The Askar 151PHQ is a quadruplet astrograph refractor featuring a 151mm aperture and 1057mm focal length for an f/7 focal ratio, designed to produce stunning flat field images of deep sky objects with a 60mm image circle that can handle sensors larger than full frame into medium format territory. This quadruplet design features a built-in field flattener, eliminating the need for separate flattening optics and making it ready for imaging right out of the box. With two ED elements, the scope offers excellent chromatic aberration control, and independent testing confirms an impressive Strehl ratio of 0.97. The scope comes standard with a large 3.4" rack & pinion focuser, a 360° rotator, and includes interchangeable M68, M54, and M48 photographic adapters, making it versatile for both astrophotography and visual observation.