ZWO UV/IR-blocking filter (2")

The ZWO UV/IR-blocking filter is an essential accessory for anyone taking astrophotographs with a refractor or other lens-based telescope. Unfocused infrared (IR) and ultraviolet (UV) light creates unwanted haze in images because, unlike the human eye, both CCD and CMOS cameras are sensitive to these wavelength ranges. ZWO's affordably priced UV/IR-blocking filter solves these issues by cutting out the unfocused portion of electromagnetic radiation, thereby improving image quality.