Askar 111f

Askar 111F Flat-Field Quadruplet Refractor Explore the sky with the Askar 111F Flat-Field Quadruplet Refractor, a versatile self-flattened astrograph designed for both visual observing and astrophotography. Features a 111mm aperture, 766mm focal length, and native f/6.9 focal ratio, making it a capable all-around telescope for deep-sky imaging, observing, and even daytime photography. Built with a quadruplet air-spaced APO optical design, using three front elements and one rear element, including one ED glass element to help reduce chromatic aberration and improve image clarity. Supports full-frame imaging with a generous 44mm image circle, delivering sharp, refined stars across the frame without requiring a separate field flattener. The self-flattened design allows users to connect imaging accessories, reach focus, and start shooting without calculating back focus or purchasing an additional flattener. Includes a photographic extension tube with a 2-inch filter thread, plus M48x0.75 and M54x0.75 adapters for broad compatibility with DSLR cameras and dedicated astronomy cameras. Built-in internal baffling helps block stray light and improve contrast, giving astrophotographers cleaner, more detailed results. Equipped with a smooth 3-inch rack-and-pinion dual-speed focuser with 1:10 fine adjustment, helping users achieve precise focus for high-quality imaging and observation. Rear 360-degree graduated rotator allows accurate camera angle adjustment, making framing and composition easier during astrophotography sessions. Retractable lens hood shortens the telescope for easier storage and transport while keeping the setup sleek and travel-friendly. CNC-machined tube construction and the classic Askar F-series blue and white finish give the telescope a clean, premium look with dependable build quality. The handle includes a finder base slot, and both sides of the focuser also feature finder bases, giving users flexible mounting options for finder scopes and accessories. Includes a long 300mm Vixen-style dovetail plate with 1/4-inch and 3/8-inch screw holes, allowing direct connection to compatible tripods and mounts. A strong choice for astrophotographers and observers looking for a cost-effective, full-frame-ready, flat-field refractor with premium usability right out of the box. Specifications Product Type: Flat-field quadruplet refractor / self-flattened astrograph Brand: Askar Model: 111F Aperture: 111mm Focal Length: 766mm Focal Ratio: f/6.9 Objective Lens: Quadruplet air-spaced APO, including one ED glass element Optical Design: Three elements in front, one element in rear Image Circle: 44mm Full-Frame Support: Yes Field Flattener Required: No, self-flattened design Built-In Baffle: Yes Focuser: 3-inch rack-and-pinion dual-speed focuser Fine Focus Adjustment: 1:10 Focuser Travel: 30mm Camera Rotator: 360-degree graduated rotator Lens Hood: Retractable Dovetail Plate: 300mm Vixen-style dovetail Tripod Mounting Threads: 1/4-inch and 3/8-inch screw holes Rear-End Thread Types: M78x1 to M54x0.75, M54x0.75 to M54x0.75, M54x0.75 to M48x0.75 Filter Thread: M48x0.75 adapter with 2-inch filter thread Photographic Adapter Support: M48x0.75 and M54x0.75 Net Weight: 5.74kg Gross Weight with Tube Ring and Dovetail Plate: 6.76kg Maximum Accessory Connection with Focuser Fully Retracted, Imaging Mode: 73mm from the base of the M48x0.75 male thread 91mm from the base of the M54x0.75 male thread Maximum Accessory Connection with Focuser Fully Retracted, Observing Mode: 132mm from the end of the 1.25-inch eyepiece holder 142mm from the end of the 2-inch eyepiece holder Minimum Accessory Connection with Focuser Fully Extended, Imaging Mode: 43mm from the base of the M48x0.75 male thread 61mm from the base of the M54x0.75 male thread Minimum Accessory Connection with Focuser Fully Extended, Observing Mode: 102mm from the end of the 1.25-inch eyepiece holder 112mm from the end of the 2-inch eyepiece holder Total Length with 1.25-Inch Adapter and Dew Shield Contracted: 664mm Total Length with 1.25-Inch Adapter and Dew Shield Fully Extended: 751mm Total Length with Photographic Adapter and Dew Shield Contracted: 728mm Total Length with Photographic Adapter and Dew Shield Fully Extended: 815mm Recommended Use: Astrophotography, visual astronomy, deep-sky imaging, full-frame imaging, and daytime photography What's in the box? Askar 111F OTA Pair of tube rings Handle 300mm Vixen dovetail plate Set of photographic adapters