Used Astronomik L-3 UV-IR Block Filter 2" (M48) Binoculars 25-inch adapter

25-inch adapter

to additionally eliminate any reflection due to light falling onto the edge of a filter

A graceful

Better choice of narrowband H-Alpha astrophotographer filter for highest contrast and revealing subtle nebula details

which corresponds to OIII emission line

Used Astronomik L-3 UV-IR Block Filter 2" (M48) Binoculars 25-inch adapterCondition: This is a used 2" Astronomik L 3 UV IR filter in excellent condition. The optics are clean and it comes in its original jewel case. Description: Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L Filter and the L3 is much narrower. If you use an optical system that is completely free of any