Askar 103APO Triplet Apochromatic Refactor Astrograph
The Askar 103APO is a professional astrograph featuring a large 103mm aperture, 700.4mm focal length, and a native f/6.8 focal ratio. The large aperture provides superior light-gathering power and high resolution, capturing rich fine details and subtle structures of deep-sky targets.
【Optical Performance & Modular Design】
Triplet APO Optical Structure: Employs a triplet air-spaced objective design including one ED (Extra-low Dispersion) glass element to thoroughly correct chromatic aberration and color fringing, delivering pinpoint star points with high contrast and color fidelity.
Exclusive Modular Tube Design: Features a removable rear tube section. Detaching the rear tube segment shortens the optical path, supporting visual observations with binoviewers and enabling ultra-fast f/4.0 imaging when paired with the dedicated 0.6x reducer.
High-Standard Anti-Reflection Treatment: Lined with matting felt inside the dew shield, coated with non-reflective matting paint, and fitted with internal baffles on the main tube to maximize suppression of stray light and internal reflections.
【Mechanical Build & Expandability】
3.3-Inch Heavy-Duty Dual-Speed Focuser: Equipped with a 100mm long travel range with high-precision scales, fully compatible with most motorized focusers on the market. Features a 360° high-precision rotator with angle markings and an oversized locking screw, ensuring stable framing even under heavy loads.
Triple Finder Mounting Bases: Independent finder bases are located on both sides of the focuser, combined with a slotted multi-functional handle, providing three mounting points to easily mount guide scopes, ASIAIR, or other accessories simultaneously.
Lightweight Tube Rings & Extended Dovetail Plate: Standard 290mm Vixen-style dovetail plate with multi-hole design for precise balance. Lightweight tube rings (weighing only 750g) feature raised bases and thumb locking screws, providing extra clearance for accessories.
Precision Full-CNC Craftsmanship: The tube body is constructed using high-precision CNC machining with anodized and spray-painted finishes, accented with iconic orange details. The front of the tube features an exclusive serial number name ring.
Specifications
| Parameter | Details |
| Aperture | 103mm |
| Focal Length | 700.4mm |
| Native Focal Ratio | f/6.8 |
| Objective Lens | Triplet air-spaced APO (including 1 ED glass element) |
| Total Length |
• 600mm (dew shield contracted) • 711mm (dew shield extended) |
| Focuser Travel Length | 100mm (3.3" dual-speed rack-and-pinion focuser, with 360° rotator) |
| Net Weight | 4.75kg |
| Gross Weight | 5.5kg (including tube rings and 290mm dovetail plate) |
| Rear Connection | 2" / 1.25" visual adapters |
| Standard Package Items | Askar 103APO OTA, pair of tube rings, multi-functional top handle, 290mm Vixen dovetail plate, manual, Oxford cloth carrying case |
Optional Correctors & Reducers
| Accessory Name | Focal Length / Ratio | Key Functionality | Thread Connections |
| 1.0x Flattener | 700.4mm / f/6.8 | Field curvature & coma correction; retains native focal ratio for flat edges and pinpoint stars. | Built-in 2" filter thread; M54 / M48 adapters |
| 0.8x Reducer | 560.3mm / f/5.4 | Reduces focal length and flattens field, widening FOV and shortening exposure times. | Built-in 2" filter thread; M54 / M48 adapters |
| 0.6x Reducer | 420.2mm / f/4.0 | Requires removing rear tube segment. Converts system to ultra-fast f/4.0 for wide-field imaging. | Built-in 2" filter thread; M68 / M54 / M48 adapters |
