Askar 111F Flat-Field

Self-flattened quadruplet astrograph which can be used for visual observing and astrophotography. The Askar 111F has 111mm aperture, 766mm focal length, and a native focal ratio of 6.9, suitable for various uses including astrophotography and daily photography. The Askar 111F adopts a quadruplet lens design (three elements in the front, one in the rear), which includes an ED glass to effectively reduce chromatic aberration. The main tube features a built-in baffle that further blocks stray light and enhances image quality. The Askar 111F supports full-frame imaging, delivering delicate and sharp stars across the frame. Featuring a self-flattened design, users can shoot directly after connecting imaging accessories and achieving focus. This eliminates the need for purchasing additional flatteners or calculating back focus, offering simple operation and a smooth experience. The Askar 111F comes standard with a photographic extension tube, which is designed with a 2-inch filter thread. It includes adapters with M48*0.75 and M54*0.75 specifications, ensuring compatibility with DSLR cameras or astronomy cameras to meet diverse needs. Adhering to Askar's consistent design philosophy, the Askar 111F emphasizes detail and user experience, striving to reduce the cost of use. The lens hood is retractable, further shortening the overall length and enhancing portability. The lens tube utilizes high-quality CNC machining and painting processes. Its appearance continues the F-series' classic blue and white color scheme, presenting a simple and elegant aesthetic. The handle of the Askar 111F is equipped with a finder base slot. Additionally, both sides of the focuser feature finder bases. This not only allows for changing the finder scope position without disassembly but also provides more locations for installing other astronomical accessories. The Askar 111F is equipped with a 3-inch rack-and-pinion dual-speed focuser supporting 1:10 fine adjustment. The fine adjustment knob includes a protective cap to prevent damage. The rear of the focuser connects to a 360° graduated rotator, allowing for precise angle adjustments. The dovetail plate is a 300mm long Vixen-style plate, equipped with 1/4-inch and 3/8-inch screw holes, enabling direct connection to a tripod. The Askar 111F, a multi-purpose self-flattened astrograph, starts your versatile deep-sky exploration journey with exceptional cost-effectiveness. Specifications Parameters Aperture size 111mm Focal length 766mm 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:   73mm (from the base of M48×0.75 male thread）  91mm（from the base of M54×0.75 male thread) Observing mode:    132mm（from the end of 1.25" eyepiece holder）  142mm（from the end of 2" eyepiece holder） Minimum accessory connection (with the focuser fully extended) Imaging mode:   43mm (from the base of M48×0.75 male thread）  61mm（from the base of M54×0.75 male thread) Observing mode:    102mm（from the end of 1.25" eyepiece holder）  112mm（from the end of 2" eyepiece holder） Total length 664mm(including 1.25" adapter as dew shield contracted）  751mm(including 1.25" adapter as dew shield fully stretched）  728mm(including the photographic adapter as dew shield contracted）  815mm(including the photographic adapter as dew shield fully stretched） Focuser travel length 30mm Net weight 5.74kg Gross weight (Including tube ring&dovetail plate) 6.76kg Rear-end thread type M78×1-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 111F OTA，a pair of tube rings, a handle, a 300mm Vixen dovetail plate,a set of photographic adapters