A portable, versatile 50mm quadruplet APO astrograph Askar's petite new 50P Petzval optic provides sharp images with APS-C and smaller cameras, providing wide-angle views and fast, f/3.8 imaging. With its 190mm focal length, you'll get a roughly 7° field across the long side of APS-C cameras, and a still-wide 3.4° with the popular ASI585 cameras... This is a great choice for beginners: The 50P's light weight makes it ideal for use on small tracking mounts like SkyWatcher's GTi and its relatively low magnification is forgiving of minor errors in tracking and polar alignment. Because of its Petzval design, there's no need for precise backfocus, either—anywhere from 50-65mm will work well, easy-peasy. ρ Ophiuchi cloud complex | Askar 50P+ZWO ASI2600MC Monoceros | Askar 50P+ZWO ASI2600MC Specifications Aperture size 50mm Focal length 190mm Focal ratio f/3.8 Objective lens Quadruplet petzval APO（including one piece of SD glass） Total length 147mm(when the dew shield is contracted) 182mm(when the dew shield is stretched) Format specifications APS-C format（optimized for 1-inch sensors） Gross weight（including tube ring and dovetail plate） 1.4kg Rear-end thread type M48 adapter (with M48×0.75 filter thread) Rear-end connection distance Support 50-65mm range (Recommended connection length is 55mm) Standard package items A 50P OTA，a manual
