Askar 65PHQ 65/416 f/6.4 apochromatic flat-field astrograph (Askar, SKU: 65PHQ) is a compact refractor for astrophotography and visual observing. Its air-spaced, five-element optical system includes two ED glass elements to reduce chromatic aberration. The integrated field-correcting optics provide a 44 mm image circle suitable for full-frame cameras, without requiring a separate field flattener at the native focal length.
The 2.5" dual-speed rack-and-pinion focuser provides coarse focusing and 1:10 fine adjustment. A graduated 360° rotator allows the camera orientation to be adjusted, while the supplied photographic adapters offer threaded connections for different imaging setups. The retractable dew shield, CNC-machined tube rings and 300 mm Vixen-style dovetail plate make the telescope practical for a portable setup. It can also be used with compatible 1.25" and 2" visual accessories.
• five-element apochromatic optical system with two low-dispersion ED elements
• integrated field correction, with no separate flattener required at the native focal length
• 44 mm image circle suitable for full-frame imaging
• 2.5" rack-and-pinion focuser with 1:10 fine adjustment and a graduated 360° rotator
• three-piece photographic adapter set with M68, M54 and M48 connections
• internal thread for a 2" filter in the final photographic adapter
• retractable dew shield, carrying handle, tube rings and a 300 mm Vixen-style dovetail plate
• suitable for visual observing with compatible diagonals and eyepieces
• optical tube assembly: Askar 65PHQ
• three-piece photographic adapter set
• pair of tube rings
• carrying handle
• 300 mm Askar Vixen-style dovetail plate
• user manual
• manufacturer: Askar
• model and manufacturer SKU: 65PHQ
• optical design: air-spaced apochromatic quintuplet with integrated field correction
• number of optical elements: five, including two ED glass elements
• aperture: 65 mm
• focal length: 416 mm
• focal ratio: f/6.4
• image circle diameter: 44 mm
• full-frame sensor compatibility: yes
• focuser: 2.5" dual-speed rack-and-pinion, with 1:10 fine adjustment
• camera rotation: 360°, with a graduated scale
• finder mounting: finder shoe on the focuser
• photographic adapter connections: M68 × 1 to M54 × 0.75; M54 × 0.75 to M54 × 0.75; M54 × 0.75 to M48 × 0.75
• camera-side thread of the complete adapter set: M48 × 0.75
• filter attachment: internal M48 × 0.75 thread for a 2" filter in the M54 × 0.75 to M48 × 0.75 adapter
• maximum accessory length with the focuser fully retracted, measured from the base of the M48 × 0.75 male thread: 76 mm
• maximum accessory length with the focuser fully retracted, measured from the base of the M54 × 0.75 male thread: 105 mm
• maximum accessory length with the focuser fully retracted, measured from the base of the M68 × 1 male thread: 130 mm
• maximum accessory length for visual use with the focuser fully retracted, measured from the end of the 2" eyepiece holder: 121 mm
• compatible visual accessory sizes: 1.25" and 2"
• mount attachment: Vixen-style dovetail plate, 300 mm long
• overall length with the three-piece photographic adapter set: 360 mm with the dew shield retracted; 420 mm with the dew shield extended
• overall length with the 1.25" eyepiece holder: 328 mm with the dew shield retracted; 388 mm with the dew shield extended
• optical tube weight: 2 kg
• total weight including tube rings and dovetail plate: 2.8 kg
• warranty: 24 months
The accessory lengths listed above describe the available space with the focuser fully retracted; they are not fixed camera spacing requirements for an external field flattener. At its native focal length, the 65PHQ uses its integrated field correction, and the imaging train must fit within the available space and reach focus. Diagonals, eyepieces, cameras and filters are selected separately.
The Askar 65PHQ combines a compact optical tube with integrated field correction, providing a practical basis for a portable imaging setup that can also be used for visual observing.
