ZWO Infrared IR Cut-Off Filter (31.7mm, 1.25")
Luminance/Infrared cut-off filters are usually being used with web cameras, color CMOS and CCD cameras to produce better quality images, as these are quite sensitive to infrared (heat) radiation of light. They will also improve sharpness of the image as most of the optics are designed for the visible spectrum, because it's very difficult to create a lens with the same focal point for the visible and IR spectrum. These filters will cut off ultraviolet (UV) as well as you can see from the transmission curve.
Please do not buy these filters for your night security camera that works with infrared LEDs, because it'll cut that IR radiation off as well.
We would recommend that this IR cut off filter is used with the ASI224MC, ASI185MC, ASI1600MC and ASI1290MC which use an AR protect window. However, an IR cut window is used for the ASI 178MC so this cut off filter is not needed for this camera.
This filter is a 1.25" ( 31.7mm ) filter and comes with an inner thread thus can be screwed together with other filters (e.g. saving your expensive Hydrogen-alpha filter from overheating).
Comes in filter box, seen on the image.