Levenhuk A10 Smartphone Adapter
Antlia Filters 50.8 mounted H-alpha PRO 3nm narrowband filter
SkyWatcher 'L' camera bracket for...
This page lists narrow band H-Alpha filters for deep-sky astrophotography. They are available in several dimensions suitable for many filter wheels and accessories.
H-Alpha and other filters for DSLR cameras are all available in a dedicated page named "DSLR Filters". For viewing click here.