About this product
Model: askar_71f_flat_field
Part Number: 71F
Askar 71F Flat-Field APO Refractor
The new Askat 71F is an Apochromatic Optical Tube 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 surrounding star points.
The Native F6.9 Focal Ratio delivers very good image quality photographically and visually. The Four Element design ensures you do not need an additional Field Flattener.
The Askar 71F is a self-flattened design that removes the need for users to calculate the back focus and buy additional flatteners. 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 ensure it is portable, 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, Askar has also included three observation accessories standard for the 71F: an 8mm eyepiece, a 20mm eyepiece, and a 1.25-inch 45° erecting prism which converts the 71F into a high-quality Terrestrial Telescope that can be used for Birding and Nature Observing.
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 rubberised 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 it easy to observe without seeing images reversed up, down, left, and right.
The Askar 71F also includes a photographic extension tube, which includes M48*0.75&M54*0.75 adapters, and a built-in 2-inch filter thread for easy shooting connections. No matter whether connecting a traditional DSLR camera or a dedicated astronomical camera, it is very convenient to use.
The mechanical design of the Askar 71F itself adheres to Askar's consistent philosophy of high quality and great value.
The dew shield of the Askar 71F is a retractable design, further shortening the overall length and increasing portability. The entire lens tube of the Askar 71F is crafted using high-quality CNC machining. The inside surface of the dew shield is covered with matt paint to reduce stray light reflections effectively. The overall blue and white colour scheme gives the telescope a premium finish.
The Handle Bar includes a standard Finderscope Slot for mounting a Finder/Guidescope.
In addition, there are two finder bases on both sides of the focuser, which eliminates the need for disassembling when changing the position of the finder scope and provides additional mounting positions for other astronomical accessories.
The Askar 71F is equipped with a dual-speed R&P 2.4-inch rigid focuser with 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 long standard Vixen dovetail plate with slotted 1/4 screw holes as well as 3/8 screw holes for direct tripod attachment.
The Askar 71F is an affordable and high-quality versatile self-flattened OTA.
Askar 71F Connection Diagram
Locking Screw Position Diagram
What's in the box
- 1x 71F OTA
- 1x Pair of tube rings
- 1x Handle
- 1x Askar 230mm Vixen dovetail plate
- 1x Set of photographic adapters
- 1x 1.25" 45° erecting prism
- 1x 8mm eyepiece
- 1x 20mm eyepiece
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 (with the focuser fully retreated) |
Imaging mode:
82.5mm (from the base of M48×0.75 male thread）
100.5mm（from the base of M54×0.75 male thread)
| Observing mode:
117mm（from the end of 1.25" eyepiece holder）
127mm（from the end of 2" eyepiece holder） |
| Total length | 372.5mm(including 1.25" adapter as dew shield contracted）
430.9mm(including 1.25" adapter as dew shield fully stretched）
415mm(including the photographic adapter as dew shield contracted）
473.4mm(including the photographic adapter as dew shield fully stretched） |
| Net weight | 2.5kg |
| Gross weight(Including tube ring&dovetail plate） | 3.0kg |
| 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 | A 71F OTA， a pair of tube rings, a handle, a Vixen 230mm dovetail plate, a set of photographic adapters, a 1.25" 45° erecting prism, an 8mm eyepiece, a 20mm eyepiece |
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