Optolong L-Ultimate 2" filter
Bought brand new, about 10 months old, great condition / practically brand new, used in a filter drawer and boxed when not used, so rarely handled with fingers directly.
Sample photos:
https://www.instagram.com/jimmyk.astro/
The narrowband targets were all taken using this filter.
$440 postage included anywhere in Australia (Brand new is $599)
Cheers