Product Link: https://www.svbony.com/uhc-filter/#F9131D
This filter is optimal for either a OneShotCamera (as in Color Camera), which is either an unmodified Canon DSLR with APS-C sensor, or modified Canon DSLR but with an additional UV/IR Cut Filter. The SVBONY CLS Filter does let UV and IR through!
This filter lets most light frequencies through, which are seen in emission nebulae. With these characteristics, the filter enhances the contrast, which is why it’s called a UHC (ultra high contrast) filter.