Closeup focusing mechanism for an objective of long focal length

Details Closeup focusing mechanism for an objective of long focal length Closeup focusing mechanism for an objective of long focal length

1979-07-12

1980-07-22

Griffin, Donald A.

354286, G03B 1700, G03B 1302

Patent

active

042136865

ABSTRACT:
In a closeup focusing mechanism for objectives of long focal length, a tube carried between the objective housing and a camera mounting means telescopes into and out of the objective housing. The camera mounting means carries an axially extending rod externally of the tube which is guided in a guide carried by the objective housing. Thus the tube does not rotate relative to the housing.

REFERENCES:
patent: 1637529 (1927-08-01), Mitchell
patent: 3045550 (1962-07-01), Kellner

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