Attachment lens system for close-up photography

Details Attachment lens system for close-up photography Attachment lens system for close-up photography

1990-04-06

1993-06-01

Dzierzynski, Paul M.

Optical: systems and elements

Lens

Selective magnification by exchanging or adding a lens...

359672, G02B 1502

Patent

active

052165469

ABSTRACT:
An attachment lens system for close-up photography in use with a master lens system in such a fashion that the attachment lens system is attached to the front of the master lens system, comprising a first lens as a positive component, a second lens whose face on the object side is convex, the second lens serving as a positive component, a third lens whose face on the master lens side is concave, the third lens serving as a negative component, and the first to third lenses being arranged in this order from the object to the master lens system, and the specific conditions on the working distance, a negative power of the lens system of the attachment lens system on the master lens system side, and the thicknesses of the specific lenses contained in the attachment lens system being satisfied.

REFERENCES:
patent: 4929068 (1990-05-01), Tsuji

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