Orion 5451 Dark Frame Imaging Filter 1.25-Inch (Black) Capture dark frames quickly to optimize astro photo quality Easily eliminate camera noise and hot pixels Opaque filter blocks all light from imaging camera sensors Allows automated dark frame capture when used with an optional filter wheel or slider Threaded for use with 1.25 inch camera nosepieces, 1.25 inch filter wheels, and 1.25 inch filter sliders