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.