Astrograph ASKAR SQA55 264mm F/4.8

Telephoto astrograph ASKAR SQ555

• Aperture: 55 mm
• Focal length: 264 mm
• F/D: f/4.8
• Lens: Quintuplet petzval APO（One piece of SD glass, one piece of ED glass）
• Maximum format: 44 mm
• Diaphragm: 14 pieces
• Aperture: f/4.8-f/22
• Minimum focusing distance: 5m
• Focusing mode: Manual
• Front filter diameter: M67
• Overall length: 316mm (with hood); 244mm (without hood)
• Weight: 1.84 kg
• Total mounted weight: 2.18 kg
• Rear adapter: M48*0.75 (with filter thread M48×0.75)
• Rear connection distance: Supports a range of 50-60mm (recommended connection length is 55mm)
• Scope of delivery: SQA55 scope, military-grade waterproof carrying case

Lens hood Special reversible design:
The lens hood is fixed by a slot; when the hood is not in use, it can be stored in the lens cylinder upside down to reduce the overall volume, and when in use, it only needs to be glued on the lens. Here is a video.

Camera quick release base:
Camera quick release knobs on the top of the handle and bottom bracket, which can be used to convert the OTA to camera lens mode manually and quickly without additional tools. Here is a video.

Diversified photography scene applications:
Optical and mechanical design optimized for both astronomical photography and everyday photography; can be used to attach to astronomical cameras to take star photos or attach to DSLR or mirrorless system cameras for use as camera lenses. Here is a video.

Superfine stars

Quintuple air-gap design composed of 1 piece of SD glass and 1 piece of ED glass. The central stars have an RMS less than 2.5 um, and the corner stars are less than 4 um, showing superfine stars.

PETZVAL structure

Self-flat design, no need to calculate a specific backfocus between 50mm and 60mm connection distance, users can directly use it to shoot once focus is achieved.

1- Filter thread

At the end of the steady rest is an M48 adapter with integrated 2" filter thread for direct connection of 2" filters.

2- Position of the quick release base

On the back of the objective tube there are four multifunctional quick release bases that can be used to connect various accessories for photography and astrophotography, and can also be perfectly adapted to the accessories of the SQA series.

Quick-release camera base

Quick-release handle for quick disassembly without tools.

Bracket

Bottom bracket has 1/4 and 3/8 screw holes for attaching the tripod.

Dovetail plate

The dovetail plate is a standard 200mm VIXEN style dovetail plate. The bottom of the dovetail plate is designed with hand screws and a quick release knob that can be removed and mounted without additional tools.

Handle

The handle features a basic finder slot that can be used to attach various astronomical accessories. The handle is quick-release and can be removed without tools.

Dual-speed eyepiece holder design

Fine and coarse adjustments can be made independently.

The aperture adjustment has a central indication point, a +-1 mm focusing travel and a locking screw.

The coarse adjustment is engraved with a reference scale for focusing distance with imperial and metric markings. In everyday photography, the focus can be adjusted using the focusing scale as a reference. The coarse adjustment is equipped with MXL-type synchronizing teeth that can be used with a toothed belt for electronic mounting.

For astrophotography, the coarse adjustment can be rotated to the infinity mark for focusing, and there is still some margin after the infinity mark thanks to the PETZVAL autoplane design between the 50 mm and 60 mm connection distance, so users can use it directly after focusing thanks to its PETZVAL design.

The coarse adjustment is also designed with a locking screw for individual adjustment.