Front converter lens

Details Front converter lens Front converter lens

2007-01-30

2007-01-30

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

C359S673000, C359S674000, C359S675000, C359S795000

Reexamination Certificate

active

11129943

ABSTRACT:
A converter lens includes a front unit and a rear unit disposed on an image side with respect to the front unit. The front unit has positive optical power and includes two positive lens elements. The two positive lens elements are spaced apart. The rear unit has negative optical power and includes a positive lens element and a negative lens element.

REFERENCES:
patent: 2005/0018293 (2005-01-01), Suzuki
patent: 55-32046 (1980-03-01), None
patent: 4-191717 (1992-07-01), None
patent: 6-289289 (1994-10-01), None

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