Askar 85 mm f/4.8 Quintuplet

Codice articolo: SQA85

Askar 85 mm f/4.8 Quintuplet Apochromat SQA85

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

Aperture 85 mm
Focal length 408 mm
Focal ratio f/4.8
Two SD elements for very good chromatic correction
5-element Petzval design for field correction up to 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 1.6 µm, and the star point at the corner is less than 2.5 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, 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.

 ped with an enlarged locking screw  Retractable 

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 32 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.

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 SQA85 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: 85 mm
Focal length: 408 mm
Focal ratio: f/4.8
Format specifications: 44 mm full-frame
Star point radius: less than 1.6 µm rms at the center, less than 2.5 µm rms at the corner
Focuser: 2.8-inch dual-speed focuser
Focusing travel: 32 mm
Rotator: 360°, lockable
Dew shield: Retractable
Total length: 403 mm when the dew shield is contracted, 439 mm when the dew shield is stretched
Rear-end thread type: M48x0.75, M54x0.75 und M68x1 via adapter
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: Vixen-style dovetail bar, length 290 mm
Tube length: 408 mm with covers
Tube height with tube ring and dovetail bar: 145 mm
Dew shield diameter: 111 mm
OTA weight: 3.64 kg
Gross weight (including tube ring and dovetail plate): 4.62 kg