Askar 130PHQ Quadruplet Astrograph

Askar 130PHQ Quadruplet Astrograph

The 130PHQ is a long focal length flat-field astrograph designed to meet the high demands of modern astronomical imaging. Its integrated optical system eliminates the need for external correctors and backfocus calculations: simply install your imaging accessories, focus, and you obtain a perfectly flat field across the entire sensor.

More capable than the 107PHQ with 23 mm additional aperture, it offers a significant gain in light-gathering power. With a 1000 mm focal length and an f/7.7 focal ratio, it is particularly suited for galaxies, globular clusters, compact nebulae and objects requiring resolution and contrast. Its quadruplet design including two ED elements ensures very fine control of chromatic aberration, coma and off-axis distortions.

Its integrated flat-field optical design covers a 60 mm image circle, supporting medium format sensors. The spot diagram shows minimal distortion at the field edge, while the central RMS radius under 2 microns reflects outstanding stellar sharpness.

The mechanical construction is on par with its optics: telescopic dew shield, precision CNC-machined tube, durable anodising, and refined finishing. Its 3.4″ rigid focuser supports heavy loads and includes a rotator. M68, M54 and M48 adapters simplify integration with full-frame cameras and filter wheels, and the M48 adapter accepts a standard 2″ filter.

A 3″ 0.7× reducer can be added, shortening the focal length to 700 mm and the focal ratio to f/5.4, effectively reducing exposure time and widening the field. Its multifunction handle, robust tube rings and standard Losmandy dovetail provide a rigid mounting solution compatible with modern equatorial mounts.

The 130PHQ is aimed at astrophotographers seeking a full-frame-ready instrument capable of resolving fine stars across the field, capturing subtle detail while remaining simple to use.

Specifications of the 130PHQ

• Aperture diameter: 130 mm
• Focal length: 1000 mm
• Focal ratio: f/7.7
• Objective: air-spaced APO quadruplet including two ED glass elements
• Image circle: 60 mm

Maximum accessory connection distance (focuser fully racked in)

• Imaging mode: 116 mm from the base of the M48×0.75 thread
• Imaging mode: 136 mm from the base of the M54×0.75 thread
• Imaging mode: 156 mm from the base of the M68×1 thread
• Imaging mode: 186 mm from the base of the M86×1 thread
• Visual mode: 148.5 mm from the end of the 2-inch focuser

Overall length

• 842.5 mm with 1.25-inch focuser and dew shield retracted
• 889.5 mm with 1.25-inch focuser and dew shield extended
• 1011.5 mm with four-piece adapter and dew shield retracted
• 1061.5 mm with four-piece adapter and dew shield extended
• OTA weight: 10.5 kg
• Total weight with tube rings and dovetail: 13 kg

Rear thread types

• M86×1 to M68×1
• M68×1 to M54×0.75
• M54×0.75 to M54×0.75
• M54×0.75 to M48×0.75 with internal M48×0.75 filter thread

Standard package contents

• 130PHQ OTA
• Pair of tube rings
• Handle
• Askar 300 mm Losmandy-type dovetail plate
• Four-piece photographic adapter set
• Manual