0.8x focal reducer and field flattener; for refractor telescopes; meet the illumination needs of full-frame shooting
You can get wider starry sky and finer star points; reduced focus; has a better signal-to-noise ratio
You can take dazzling celestial photos; no distortion of the star points on the edge of the photo; good quality picture
It will be durable; multi-coated optics; high polish; hard anodize finished aluminum body; to help reduce weight
About the compatibility; has standard 2" filter thread; to add light pollution filter; a standard 2-inch socket in front end; to connect to the main lens; M48x0.75 threaded in back end; can be connected with the camera bayonet