The Askar 131F Flat-Field Refractor is a premium 131 mm f/7.5 quadruplet apochromatic telescope designed for advanced astrophotography and visual observing. Featuring a 983 mm focal length and integrated flat-field correction, it delivers sharp, well-corrected images across a full-frame 44 mm image circle without requiring an additional field flattener or complex back focus calculations. Its optical system incorporates an ED glass element and internal baffling to reduce chromatic aberration and suppress stray light for improved contrast and image quality. Built with a precision CNC-machined tube, a heavy-duty 3-inch rack and pinion focuser, and a versatile adapter system, the Askar 131F provides excellent performance and broad compatibility for demanding imaging setups.

• 131 mm aperture with 983 mm focal length and f/7.5 focal ratio for high-resolution imaging and observing
• Quadruplet apochromatic optical design with one ED element for sharp, color-corrected performance
• Integrated flat-field design supports full-frame imaging without requiring an external flattener
• Large 3-inch rack and pinion focuser designed to support heavy imaging equipment with precise control
• Includes multiple adapter options including 1.25-inch, M48, M54, and M78 connections for broad accessory compatibility