The Askar 65PHQ is a professional apochromatic flatfield Petzval quintuplet with a focal ratio of f/6.4 and an image circle of 44mm in diameter. The Askar 65PHQ includes two Extra Low Dispersion glass elements for superb correction of chromatic aberration.

Differently from standard ED refractors, the Askar 65PHQ features a Petzval design that does not require to set the sensor to a specific distance to the last lens. That leaves the freedom to use any filter wheel, any off-axis guider or accessory without any worry to calculate the correct distance from the flattener.

With a large 44mm image circle and a focal ratio of f/6.4, this is the perfect astrograph for the advanced astrophotographer. The large rack and pinion 2.5" focuser can be rotated 360° to perfectly frame the subject and has a reduction gear of 10:1 for precise focusing.

All the lenses are fully multi-coated and the tube is internally flocked to reduce reflections and absorb stray light. The tube is made of CNC-machined aluminium, the rack and pinion focusing mechanism of brass and the mechanical components are engineered to provide the best rigidity, performance and durability.

Specifications

Optical design	Apochromatic Quintuplet air-spaced
Objective diameter	65 mm
Focal length	416 mm
Focal ratio	f/6.4
Resolving power	1.78 arc seconds
Stellar limiting magnitude	11.76
Max. magnification	162.5 x
Light gathering power	86.22 times the human eye
Mount attachment	Vixen style dovetail plate (300 mm long)
Focuser	Rack & pinion dual speed (10:1) 2.5" diameter
Included connection adapters	M68 x 1, M54 x 0.75, M48 x 0.75 (with 2" filter thread)
Backfocus	130 mm (from the base of the M68 thread)
Tube weight	2.8 kg (including tube rings and dovetail bar)
Tube diameter	80 mm
Dew shield diameter	88 mm
SKU	AS-65PHQ

Included items

Askar 65PHQ
Pair of tube rings
300mm Vixen style dovetail bar
Carrying handle
Adapter M68 x 1 to M54 x 0.75
Adapter M54 x 0.75 to M54 x 0.75
Adapter M54 x 0.75 to M48 x 0.75 with 2" filter thread
Manual

Gallery

The Rosette Nebula by Clayton Haynes | Askar 65PHQ, ZWO ASI533MC Pro, ZWO AM5.

The Carina Nebula by Simon Kidd | Askar 65PHQ, Sky-Watcher Star Adventurer GTI, unmodified Canon 200D

ASKAR 65PHQ