Askar 111F - 111 mm f/6.9 Quadruplet Flat-Field APO Refractor - 111F - In Stock!

Askar 111 mm Quad ED APO Flat-Field Refractor

Askar 111F Flat Field Quad Refractor Highlights

The Askar 111F has an aperture of 111 mm, a 766mm focal length, and a native focal ratio of 6.9, suitable for various uses including astrophotography and daytime photography.

The Askar 111F uses a quadruplet lens design (three elements in the front, one in the rear), which includes an ED glass element to effectively reduce chromatic aberration. The main tube features a built-in baffle that further blocks stray light and enhances image quality. Featuring a self-flattened design, the Askar 111F Quad also supports full-frame imaging.

This 111 mm f/6.9 Quadruplet Refractor has a self-flattened design that allows users to avoid calculating the back focus and buying an additional flattener.  After attaching the imaging accessories, users can use it for photography after the OTA is in focus. This further reduces the cost and improves the pleasure imaging through your 111F.

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 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.

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 optional 0.74x reducer, shown above, brings the Askar 111F's focal ratio down to F/5.1.  This reducer features a triplet optical design and supports a 44mm full-frame image circle.

Specifications