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Was it a ZWB2? I have been looking for uv bandpass filters for uv photography that doesn't have the ir leakage but the baader-u seems unusually pricy, curious if you know of any alternatives

Was actually something I got from aliexpress a year or two ago. Specs are a bit of a mystery and it wasn't well labeled, which is why I forgot it was a bandpass. Anecdotally it seems pretty good but haven't tested rigorously www.aliexpress.us/item/3256803...

Scrounged around optical parts box and found this little guy. Not ideal but should work for now 🫤

Love the 3d printed optical mount!