The Askar 111F Flat-Field Refractor is a versatile quadruplet apochromatic refractor designed for both astrophotography and visual observing. Featuring a 111 mm aperture and a 766 mm focal length at f/6.9, it delivers strong light gathering capability, excellent image sharpness, and a practical balance between wide field imaging and medium focal length performance. Its integrated flat-field optical design eliminates the need for external field flatteners or complex backspacing adjustments, making setup simpler and more reliable for imaging applications. A robust 3-inch rack and pinion focuser supports heavy imaging equipment while maintaining precise focus control, and the included adapters and accessory mounting options add to the telescope’s overall flexibility and value.

• 111 mm aperture with f/6.9 focal ratio and 766 mm focal length for versatile imaging and observing performance
• Quadruplet apochromatic optical design with an ED element for high contrast, color-corrected images
• Integrated flat-field correction eliminates the need for additional flatteners or precise backspacing adjustments
• Heavy-duty 3-inch rack and pinion focuser supports large imaging trains and electronic focus systems
• Includes imaging and visual adapters along with multiple accessory mounting points for expanded functionality

The Askar 111F Flat-Field Refractor combines a 111 mm aperture with a f/6.9 focal ratio and 766 mm focal length, offering an excellent balance of wide field coverage and medium magnification performance. Its quadruplet apochromatic optical design, featuring an ED glass element, produces sharp, high-contrast, color-corrected images across a fully illuminated 44 mm image circle. Integrated flat-field correction eliminates the need for additional flatteners or reducers, allowing straightforward imaging with cameras up to full-frame size while avoiding complicated spacing requirements.

The Askar 111F is designed to support both visual observing and astrophotography right out of the box. A pre-installed 1.25-inch adapter allows for easy connection of a user-supplied diagonal for visual use or a camera nosepiece for straightforward imaging setups. For more advanced astrophotography configurations, the adapter system can be reconfigured to provide threaded connections, including standard M48 threads as well as larger M54 and M78 options for demanding imaging equipment and full-frame camera systems.

The Askar 111F Flat-Field Refractor features a large 3-inch dual-speed rack and pinion focuser designed for precision focusing and strong equipment support. Its robust construction allows it to handle heavy imaging trains with confidence while maintaining smooth and accurate adjustment control. The focuser is also compatible with most bracket-style electronic autofocus systems, making it easy to integrate automated focusing for advanced astrophotography setups.