Askar 106 mm f/4.8 Quintuplet

Codice articolo: SQA106

Askar 106 mm f/4.8 Quintuplet Apochromat SQA106

This high-quality quintuplet air-spaced SD glass Petzval astrograph is very well suited for astrophotography of larger areas

Aperture 106 mm
Focal length 509 mm
Focal ratio f/4.8
Two SD elements for very good chromatic correction
5-element Petzval design for field correction up to more than full frame format
Connection threads M68x1, M54x0.75 and M48x0.75 with sufficient back focus
Suitable for DSLR, mirrorless system cameras and astro cameras
360° rotator for the camera
Dual speed for precise focusing (astrophotography)
Three finder bases

Superior star point performance
Quintuplet air-spaced lens design, including 2 pieces of SD glass. The central star point has an RMS radius of less than 1.7 µm, and the star point at the corner is less than 2.2 µm, showing a super-fine star point. It also has excellent full-field illumination and MTF data.

Petzval structure
Integrated self-flattened design, supporting a 44 mm full-frame image circle and giving very good results up to 55 mm image circle, no need for additional flatteners, and no need for additional calculation of the back focus. Between 40 mm and 70 mm connection distance, users can directly use it for shooting after the OTA is in focus.

Retractable dew shield
The dew shield is a retractable design that can be pulled out when used. It protects the lens from the impact of external and internal light and protects the lens itself.

Large, rigid dual-speed focuser
Dual-speed rack-and-pinion large 2.8-inch rigid focuser, which can be compatible with most motorized focusers on the market. The focusing travel is 30 mm, and the focuser tube is engraved with high-precision scales. The entire focuser barrel is CNC machined with an anti-reflective internal design and matting paint, providing extra measures to eliminate stray light.

360° rotator
The rear of the focuser is equipped with a 360° high-precision rotator with a precision scale to allow the user to adjust and save the angle of rotation. It is also equipped with an enlarged locking screw for easy locking even under high loads.

Rear-end adapters
The end of the SQA106 is equipped with a variety of adapters, all of which are toothed and ribbed, making it easy to rotate manually without slipping. The adapters are available in sizes M68, M54, and M48 and can be used to attach various accessories, such as full-frame cameras.

Finder bases
On both sides of the focuser, there are two finder bases, which not only eliminate the need for disassembling when changing the position of the finder scope but also provide additional mounting positions for other astronomical accessories.

High-quality machining
The entire SQA106 tube is crafted using high-quality CNC machining with anodized and surface spray paint treatments. The top of the handle and the focuser are all designed with exclusive nameplates, demonstrating high-end quality.

Objective lens: Quintuplet Petzval apo (including two pieces of SD glass), self-flattening
Aperture: 106 mm
Focal length: 509 mm
Focal ratio: f/4.8
Format specifications: 44 mm full-frame, medium format (55 mm) possible
Illumination: above 90% for 44 mm, over 75% for 55 mm
Star point radius: less than 1.7 µm rms at the center, less than 2.2 µm rms at the corner
Focuser: 2.8-inch dual-speed focuser
Focusing travel: 30 mm
Rotator: 360°, lockable
Dew shield: Retractable
Total length: 516 mm when the dew shield is contracted, 585 mm when the dew shield is stretched
Rear-end thread type: M48x0.75, M54x0.75 und M68x1 via adapter, M78 directly
Rear-end connection distance: Supports 40-70 mm range (recommended connection length is 55 mm)
Finder bases on the focuser: 2
Tube ring: With additional finder base
Mount connection: Losmandy-style dovetail bar, length 300 mm
Tube height with tube ring and dovetail bar: 182 mm
Dew shield diameter: 145 mm
OTA weight: 5.82 kg