Askar 65PHQ 65mm f/6.4 Quintuplet Flat-Field Astrograph Telescope

65PHQ is a flatfield astrograph newly launched after 80PHQ, 107PHQ, and 130PHQ. Instead of buying extra flatteners, calculating the back focus of the flattener, or making a tedious connection to match the correct distance, astrophotographers can simply equip it with any possible imaging accessories, make the target stay at the focus, and then the whole optical system is perfect for imaging.   Product introduction 65mm aperture 416mm focal length Quadruplet air-spaced APO design Supporting full frame Central RMS radius 2.5um No need for flattener 0.75x Reducer (optional) No need to calculate the backfocus Retractable lens hood 300mm dovetail plate multi-functional handle 2.5" large rack- pinion focuser 1:10 fine adjustment Various adapter   65PHQ is a flatfield astrograph newly launched after 80PHQ, 107PHQ, and 130PHQ. Instead of buying extra flatteners, calculating the back focus of the flattener, or making a tedious connection to matc