Combination sun-moon filter

Details Combination sun-moon filter Combination sun-moon filter

1979-09-07

1981-07-21

Henry, Jon W.

350316, G02B 2300, G02B 522

Patent

active

042794633

ABSTRACT:
A combination sun-moon filter employs a first filter that is mounted at the front of the telescope and a second that is mounted in the telescope near the eyepiece. Each filter transmits approximately one percent of the light that strikes it, and both filters together reduce the amount of light leaving the viewing opening of the telescope to a value low enough for comfortable solar viewing. To convert to lunar viewing, it is only necessary to remove the front filter, and the remaining filter reduces light intensity enough for comfortable viewing of a bright moon.

REFERENCES:
patent: 2379153 (1945-06-01), Holste
patent: 2953970 (1960-09-01), Maynard
patent: 3351408 (1967-11-01), Krewalk
patent: 3870403 (1975-03-01), Ward
patent: 3897140 (1975-07-01), Tuthill
patent: 4027943 (1977-06-01), Everett
patent: 4165919 (1979-08-01), Little

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