This sky watcher coma corrector is optimised for all sky watcher fast ratio f5 newtonian reflectors dobsonians with 2 focuser delivers stunning wide field views with pinpoint stars to the edge of the field magnification remains unaltered supplied complete with necessary adaptors for visual use for imaging use with a dslr camera a suitable m48x075 adaptor is required to match your camera sky watcher manufactured canon and nikon m48x075 adaptors are available prod codes 20237 20238