Has internal M48 filter threads on one side for attaching 2" Baader Astro-Filters and external M54 threads on the same side for attachment of Baader Hyperion DT-Rings. Please note that due to this adapter design (both threads on the same side) and the unique design of the cells of Baader filters, this adapter will only work with Baader's filters. Most other standard 2" filters do not have a male M48 thread that is long enough to reach the M48 female thread from the inside on this adapter.
As a bonus, this adapter also has a standard female SCT thread (2", 24TPI) on the other side, so this can also function as an M48 female to SCT female adapter or as a M54 male to SCT female adapter.
OPTICAL TUBE LENGTH 5
USAGE to mount our 2" filters on any DSLR camera lens
INNER DIAMETER / CLEAR APERTURE 47mm
OUTER DIAMETER 56mm
INNER CONNECTION (LENS SIDED) Thread, 2"
INNER CONNECTION (EYEPIECE/-CAMERA-SIDED) Thread, M48
OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED) Thread, SP54
ADAPTABLE TO DSLR camera-lenses