ASKAR 71F Quadruplet Flatfield Apochromatic Refractor Telescope

Lightweight, Compact, and Affordable Astrograph for Visual Observing and Astrophotography

Ideal for Full-Frame Imaging!

The ASKAR 71F is an advanced Optical Tube Assembly (OTA) with a 71mm aperture, a 490mm focal length, and a native focal ratio of F6.9. This telescope is perfect for both beginners and experienced astronomers, offering exceptional performance at an affordable price.

Key Features:

• Quadruplet Air-Spaced APO Lens Design: Incorporates one piece of ED glass to significantly reduce chromatic aberration.
• 44mm Full-Frame Imaging: Provides excellent performance with sharp star points across the entire field.
• Self-Flattened Design: Eliminates the need for additional flatteners, making it user-friendly and cost-effective.
• Lightweight and Portable: Weighs only 2.5kg, with a gross weight of 3kg (including tube rings and dovetail plate), making it easy to transport and set up.

Versatility and Practicality:

• Suitable for both visual observation and astrophotography.
• Comes with three standard observation accessories: an 8mm eyepiece (60x magnification), a 20mm eyepiece (25x magnification), and a 1.25-inch 45° erecting prism for correct image orientation.
• Eyepieces are ideal for birdwatching and landscape viewing, featuring a 1.25-inch barrel and rubberized tops for comfort.

Convenient Connectivity:

• Includes a photographic extension tube with M480.75 and M540.75 adapters, and a built-in 2-inch filter thread.
• Easily connects to traditional DSLR cameras or professional astronomical cameras for hassle-free astrophotography.

High-Quality Design and Construction:

• Retractable dew shield enhances portability.
• Crafted with high-quality CNC machining, featuring an inner surface with matting paint to reduce stray light reflections.
• Elegant blue and white color scheme.
• Equipped with a dual-speed R&P 2.4-inch rigid focuser, featuring 1:10 fine adjustment and a 360° scale field rotator for precise angle adjustments.
• 230mm standard Vixen dovetail plate with slotted 1/4 and 3/8 screw holes for direct tripod attachment.

Additional Features:

• Finder base slot on the handle bar, with two finder bases on both sides of the focuser for versatile accessory mounting.
• Comprehensive design adheres to ASKAR's philosophy of minimizing user costs and maximizing convenience.

Specifications:

• Aperture Size: 71mm
• Focal Length: 490mm
• Focal Ratio: f/6.9
• Objective Lens: Quadruplet air-spaced APO (including one ED glass)
• Image Circle: 44mm
• Maximum Accessory Connection:
  • Imaging Mode: 82.5mm (M48×0.75 male thread), 100.5mm (M54×0.75 male thread)
  • Observing Mode: 117mm (1.25" eyepiece holder), 127mm (2" eyepiece holder)
• Total Length:
  • 372.5mm (dew shield contracted, including 1.25" adapter)
  • 430.9mm (dew shield fully stretched, including 1.25" adapter)
  • 415mm (dew shield contracted, including photographic adapter)
  • 473.4mm (dew shield fully stretched, including photographic adapter)
• Net Weight: 2.5kg
• Gross Weight: 3.0kg (including tube ring & dovetail plate)
• Rear-End Thread Type: M64×0.75-M54×0.75, M54×0.75-M54×0.75, M54×0.75-M48×0.75 (with M48×0.75 filter thread)

Standard Package Items:

• 71F OTA
• Pair of tube rings
• Handle
• Vixen 230mm dovetail plate
• Set of photographic adapters
• 1.25" 45° erecting prism
• 8mm eyepiece
• 20mm eyepiece

Explore the universe with the ASKAR 71F, a versatile and high-quality telescope that combines affordability with exceptional performance.

ASKAR 71F Quadruplet Flatfield Apochromatic Refractor Telescope

Lightweight, compact， affordable， quadruplet flat-field Astrograph which can be used for visual observing and astrophotography.

FOR FULL-FRAME IMAGING!

The Askar 71F is an OTA with an aperture of 71mm, a focal length of 490mm, and a native focal ratio of F6.9. 

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 44mm 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 shooting after the OTA is in focus. This further reduces the cost and improves the pleasure of shooting.

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 2.5kg and the gross weight is 3kg (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, we've also included three observation accessories standard for the 71F: an 8mm eyepiece, a 20mm eyepiece, and a 1.25-inch 45° erecting prism.

The 8mm eyepiece has a magnification of 60x and the 20mm eyepiece has a magnification of 25x. The Askar 71F can be used with different eyepieces depending on the target, 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.

The Askar 71F also comes standard with a photographic extension tube, which includes M48*0.75&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 shooting accessories to record the beautiful view at any time.

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 230mm standard Vixen dovetail plate, which slotted 1/4 screw holes as well as 3/8 screw holes for direct tripod attachment.

As an affordable and high-quality versatile self-flattened OTA, we look forward to the Askar 71F accompanying you to discover more beautiful!

Specifications

Product Size Diagram

71F Connection Diagram

Locking Screw Position Diagram

EAF (optional) Installation

Optical Path Diagram

Spot Diagram