Askar SQA70 – Compact Quintuplet Petzval Astrograph

The Askar SQA70 is a fast, wide-field astrograph designed for crisp, flat images across today’s large sensors. Its quintuplet Petzval optical design (with ED glass) delivers tight, colour-pure stars to the corners—no separate field flattener required. Lightweight, travel-friendly, and purpose-built for deep-sky imaging.

Why astrophotographers love it

• Fast & wide: ~336 mm focal length at around f/4.8 for low-noise, wide-field captures.
• True flat field: Petzval design keeps stars sharp to the edge, ideal for APS-C and full-frame sensors.
• Excellent colour control: ED elements reduce chromatic aberration for clean, high-contrast data.
• Portable build: Compact tube with retractable dew shield; easy to mount and balance.
• Imaging-ready rear end: Robust focuser and common adapter threads for straightforward camera hookup.

What it’s great for

• Large nebulae, Milky Way star fields, dark-nebula complexes
• Wide mosaics and fast survey projects
• Travel rigs where size, speed, and field flatness matter

Technical summary

Optical design	Quintuplet Petzval (ED glass, native flat field)
Aperture	70 mm
Focal length / Ratio	≈ 336 mm  |  f/4.8
Image circle	Full-frame compatible (flat, corrected field)
Focuser	Precision rack-and-pinion, dual-speed (imaging grade)
Tube length	Product introduction Specifications Parameters Aperture size 70mm Focal length 336mm Focal ratio f/4.8 Objective lens Quintuplet petzval APO（including two pieces of ED glass） Total length 332mm(when the dew shield is contracted)        372mm(when the dew shield is stretched) Format specifications full frame（44mm） OTA weight 2.68kg Gross weight（including tube ring and dovetail plate） 3.5kg Rear-end thread type M42/M48(with M48×0.75 filter thread)/M54 adapters Rear-end connection distance Support 37-68mm range (Recommended connection length is 55mm) Standard package items a SQA70 OTA, an Oxford cloth case   Product Size Diagram   SQA70 Connection Diagram The  Locking Screw Position Diagram SQA70 Electronic Focuser Assembly Diagram Video Images