Apo Askar 71F 71 mm f/6.9

Codice articolo: AS71F

The 71F is a very transportable APO refractor for astrophotography with corrected field of view up to full frame format and for observing up to the highest magnification range.

Aperture 71 mm / focal length 490 mm / focal ratio f/6.9
4-element system with colorless ED triplet objective and one correction element built into the tube
44 mm illuminated image circle with very good correction up to full-frame format
Stable 2.4" dual-speed RAP focuser with 360° rotation, threaded connections, 2" adapter and 1.25" adapter
Sufficient working distance for observation with 1.25" accessories
Suitable photo adapters are included in the scope of delivery
Tube rings with Vixen/EQ5 style dovetail bar (230 mm) and carrying handle
2 finder shoes for standard finders and mini guide scopes included
Retractable dew shield
Lightweight (3 kg) and short (372.5 mm) - suitable for traveling
Comes with 1.25" visual accessories: 45° erecting prism, 20 mm Plössl eyepiece, 8 mm Plössl eyepiece

Askar 71 mm f/6.9 APO Astrograph
The Askar 71F is an OTA with an aperture of 71 mm, a focal length of 490 mm, and a native focal ratio of f/6.9.

The Askar 71F adopts a quadruplet air-spaced APO lens design, including one piece of ED glass. which can effectively reduce chromatic aberration. The Askar 71F supports 44 mm full-frame imaging with great performance of the surrounding star points.

The Askar 71F is a self-flattened design that allows users to avoid calculating the back focus and buying additional flattener, after attaching the imaging accessories, users can directly use it for photographing after the OTA is in focus. This further reduces the cost and improves the pleasure of photography.

Lightweight instrument for visual use
With practicality and versatility in mind, the Askar 71F´s weight and size are effectively controlled, making it easy to carry and use. The Askar 71F OTA weighs only 2.5 kg and the gross weight is 3 kg (including the tube rings and dovetail plate).

The Askar 71F is versatile in its use, allowing for both visual observation and astrophotography. For users´ convenience, Askar has also included three observation accessories standard for the 71F: an 8 mm eyepiece, a 20 mm eyepiece, and a 1.25-inch 45° erecting prism.

The 8 mm eyepiece has a magnification of 60x and the 20 mm eyepiece has a magnification of 25x. The Askar 71F can be used with different eyepieces depending on the object, and both eyepieces are ideal for viewing birds and landscapes.

Both eyepieces have a 1.25-inch barrel and a rubberized top for a soft and comfortable user experience.

The 1.25-inch 45° erecting prism provides correct left-to-right and down-to-up image views, making users easy for you to observing without the hassle of seeing images reversed up, down, left, and right.

Hassle-free astrophotography
The Askar 71F also comes standard with a photographic extension tube, which includes M48*0.75 and M54*0.75 adapters, it also contains a built-in 2-inch filter thread for easy shooting connections. No matter whether connecting a traditional DSLR camera or a professional astronomical camera, it is very convenient to use. When users go out, they can directly connect the photographic accessories to record the beautiful view at any time.

Practical mechanics
The mechanical design of the Askar 71F itself adheres to Askar´s consistent philosophy of taking into account the user´s habits and minimizing the user´s invisible costs.

The dew shield of the Askar 71F is a retractable design, further shortening the overall length and increasing portability. The entire lens tube of Askar 71F is crafted using high-quality CNC machining. All the inner of the Askar 71F´s dew shield is covered with matting paint to effectively reduce stray light reflections. The overall blue and white color scheme makes the telescope look more refined.

On the handle bar of Askar 71F, it designs a finder base slot. Besides, there are two finder bases on both sides of the focuser, which not only eliminates the need for disassembling when changing the position of the finder scope but also provides additional mounting positions for other astronomical accessories.

In terms of the focuser, the Askar 71F is equipped with a dual-speed R&P 2.4-inch rigid focuser, which has a 1:10 fine adjustment and a 360° scale field rotator at the rear end for precise angle adjustment.

The Askar 71F´s dovetail plate is a 230 mm Vixen style dovetail plate, which slotted 1/4" screw holes as well as 3/8" screw holes for direct tripod attachment.

Specifiche tecniche:

Aperture: 71 mm
Focal length: 490 mm
Focal ratio: f/6.9
Optical system: Quadruplet with ED element
Objective: Air-spaced triplet objective
Corrector: Single-element corrector
Coating: All surfaces are multi-coated
Illuminated and corrected field of view: 44 mm diameter
Focuser: 2.4" dual-speed rack and pinion focuser
Connections: 2", 1.25", M64x0.75 female thread, M54x0.75 male thread, M48x0.75 male thread
Visual working distance: 127 mm from the end of the 2" eyepiece holder, 117 mm from the end of the 1.25" eyepiece holder
Working distances for screw connections: 82.5 mm from M48×0.75 external thread, 100.5 mm from M54×0.75 external thread
Filter thread: 2" filter thread is included in the M48 camera adapter
Rotation option on the focuser: Yes, with scale
Dew shield diameter: 87.6 mm
Tube diameter: 78 mm
Transport length (dew shield retracted): 372.5 mm (with 1.25" adapter) to 415 mm (with all four photo adapters)
Working length (dew shield extended): 431 mm (with 1.25" adapter) to 474 mm (with all four photo adapters)
Net weight (OTA only): 2.5 kg
Total weight (with tube rings and dovetail bar): 3.0 kg