Skywatcher Explorer 200P Ota 150mm the Bahtinov mask works by

the Bahtinov mask works by forming a diffraction pattern of “spikes” of light around a star or point light source

ASI290 etc

Includes a camera control feature and shutter release cable that allows you to remotely take a series of exposures using your digital SLR camera

and tools for identifying celestial objects and investigating them scientifically

Out of the box

Skywatcher Explorer 200P Ota 150mm the Bahtinov mask works byThe Skywatcher Explorer 200P features a 200mm Parabolic primary mirror, and id the perfect upgrade for the expanding astronomer. Standard Specifications: Magnifications (with eyepieces supplied): x40, x80, x100, x200 Highest Practical Power (Potential): x400 Diameter of Primary Mirror: 200mm Telescope Focal Length: 1000mm (f 5) Eyepiece Supplied (1. 25"): 10mm & 25mm x2 Deluxe Barlow Lens 1. 25" (with Camera Adaptor) Dual Fit 1. 25" 2" Focuser