The Askar 151PHQ represents the pinnacle of the PHQ series, offering a massive 151mm aperture for the most demanding astrophotographers. As a flat-field astrograph with a native 1057mm focal length and f/7 focal ratio, it eliminates the need for field flatteners on sensors up to medium format, simplifying the imaging train while delivering stunning optical performance.
The telescope features a sophisticated quadruplet air-spaced optical design that incorporates two elements of ED (Extra-low Dispersion) glass. This configuration ensures exceptional correction of chromatic aberration and distortion, producing pinpoint stars across a generous 60mm image circle. The RMS radius is less than 2 microns at the center, guaranteeing crisp resolution.
Unlike traditional refractors that require precise back-focus spacing for optional flatteners, the 151PHQ is designed for convenience. As long as your camera reaches focus, the field is flat. This plug-and-play approach saves valuable time and frustration in the field. It also supports visual observation with standard diagonals and eyepieces.
For those seeking wider fields and faster speeds, the 151PHQ is compatible with an exclusive 0.7x reducer (sold separately). This transforms the telescope into an f/4.9 astrograph with a 740mm focal length, dramatically reducing exposure times for capturing faint nebulae and galaxies.
The 151PHQ is built for heavy-duty setups, featuring a robust 3.4-inch rack-and-pinion focuser with a 360° rotator. It comes complete with a comprehensive adapter set (M68, M54, M48), heavy-duty tube rings, a multi-functional handle, and a 300mm Losmandy-style dovetail plate, all protected in a sturdy aluminum case.