I was just wondering if each filter including the Luminance filter have UV cut off. It says there is infrared cutoff 700-1100 but wondering if a UV filter would still be recommended.
For this filter set there's transmission from about 380nm to 700nm, wavelengths higher and lower than this are not transmitted, so there is a cut off in effect at 380nm for UV. The ZWO IR/UV cut filter cuts of IR at about the same place, with UV being cut a little tighter at 400nm. I'd say get the UV/IR cut filter if you feel the difference between 380nm and 400nm will affect you, but we would say don't worry about it. Here's a good article on UV light and astrophotography: https://midnightphotographer.com/uv-filter-astrophotography/