This is what I used on my ED80 for Ha solar observing and photography.
Includes:
Lunt LS60F Ha Etalon
Adapter for LS60F to ED80 scope
Lunt B1200 Ha 25mm Blocking Filter
LS60F screws into the adapter which slides onto the dew shield on the front of the ED80. The fit should be firm on the dew shield. I used and recommend some electrical tape as a safety to ensure the adapter can't "fall off" the scope even though the fit is firm.
