What size Baader filter do I need if I want to use it with my binoculars?
Baader filter material may be used over one binocular main objective, as long as the lens cap is kept in place over the other objective, or two pieces may be mounted to both objectives. Never use solar filters with an eyepiece, attached either in front of the eyepiece, or on the viewing portion. The already magnified sunlight coming through the main objective may burn through the filter to your eye. The correct placement of any solar filter material is in front of the main objective (large light-gathering lens at the front of the telescope or binoculars).
