Askar 160APO Refractor: Premium Astrograph for Astrophotography Large 160mm Aperture: Captures more light for brighter, clearer images. 1120mm Focal Length with f/7 Ratio: Ideal balance for detailed deep-sky observations. Triplet Air-Spaced APO Design: Includes one ED glass element to minimize chromatic aberration. Retractable Lens Tube: Adjustable length for versatile use with various accessories. Compatible with 1.0x Flattener and 0.8x Reducer: Enhances imaging capabilities for different astrophotography needs. Comprehensive Package: Comes with tube rings, handle, Losmandy dovetail plate, and aluminum case for convenience. The Askar 160APO is a high-quality astrograph with a large aperture, designed to meet the needs of serious astrophotographers. Specifications Parameters Aperture size 160mm Focal length 1120mm Focal ratio f/7 Objective lens Triplet air-spaced APO (including one ED glass) Total length 883mm(when the dew shield is contracted)996mm(when the dew shield is stretched) The length of the rear retractable lens tube 115mm OTA weight 11.4kg Gross weight(including tube ring and dovetail plate) 13.6kg Rear-end thread type 2"/1.25" visual adapters Standard package items an 160APO OTA, a pair of tube rings, a handle, an Askar 400mm Losmandy dovetail plate, an aluminum box,a manual