Optical: systems and elements – Lens – Reverse telephoto
Patent
1993-09-13
1994-05-24
Ben, Loha
Optical: systems and elements
Lens
Reverse telephoto
359781, 359823, 359686, G02B 1304
Patent
active
053154410
ABSTRACT:
An inverse telephoto large aperture wide angle lens comprises a first lens group with a negative refractive power, a second lens group with a positive refractive power, a stop, a third lens group with a negative refractive power, and a fourth lens group with a positive refractive power arranged in the named order from a side of an object, in which for focusing on a near object from infinity the first lens group is fixed with respect to an image surface, and the second, third, and fourth lens groups are moved along an optical axis thereof toward the object such that a space between the first lens group and the second group and a space between the second lens group and the third lens group decrease, but a space between the third lens group and the fourth lens group increases.
REFERENCES:
patent: 3771853 (1973-11-01), Nakamura
patent: 3923369 (1975-12-01), Nakamura
patent: 4390252 (1983-06-01), Mori
patent: 4516839 (1985-05-01), Tokumara
patent: 4653873 (1987-03-01), Kawamura
patent: 4687302 (1987-08-01), Ikemori et al.
patent: 4759617 (1988-07-01), Tokomura et al.
patent: 4846562 (1989-07-01), Tokumaru et al.
patent: 5078481 (1992-01-01), Nakayama et al.
patent: 5132848 (1992-07-01), Nishio et al.
Hori Kenji
Tatsuno Wataru
Ben Loha
Nikon Corporation
LandOfFree
Inverse telephoto large aperture wide angle lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Inverse telephoto large aperture wide angle lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Inverse telephoto large aperture wide angle lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1977371