Askar 65PHQ – 65mm f/6.5 Petzval Quadruplet Astrograph

Description

The Askar 65PHQ is a 65mm f/6.5 Petzval quadruplet astrograph designed specifically for deep-sky astrophotography. The 5-element optical design (including a dedicated field flattener group) delivers a completely flat, coma-free field across full-frame sensors — no additional flattener or reducer needed out of the box.

With a 422mm focal length at f/6.5, the 65PHQ hits a sweet spot between field of view and image scale that works beautifully for a wide range of deep-sky targets. The Petzval design keeps the optical train short and compact while delivering edge-to-edge sharpness that rivals much more expensive instruments.

The PHQ series from Askar uses premium FPL-53 ED glass elements and multi-coated optics for excellent colour correction and contrast. The focuser is a precision 2.5″ rack-and-pinion design with 1:10 fine focus ratio. A built-in dovetail and tube rings make setup quick and straightforward.

Key Features

• 5-element Petzval quadruplet optical design
• FPL-53 ED glass for excellent colour correction
• Flat field across full-frame sensors — no flattener needed
• 65mm aperture, 422mm focal length, f/6.5
• 2.5″ rack-and-pinion focuser with 1:10 fine focus
• Compact and lightweight
• Integrated dovetail plate

Specifications

Optional 0.75x reducer available separately to convert to f/4.9 at 317mm focal length for even faster imaging.