1988-09-21
1989-06-06
Arnold, Bruce Y.
350450, G02B 1514, G02B 964
Patent
active
048366633
ABSTRACT:
A telephoto zoom lens system of a four-group composition that is capable of producing a high zoom ratio without increasing the complexity of a diaphragm stop mechanism and which yet is made compact in structure without sacrificing performance. The telephoto zoom lens system is composed, in order from the object side, of a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power together with a diaphragm stop provided for adjusting the quantity of light admitted, and a fourth lens group having a positive refractive power which consists of lens unit IVA having a positive refractive power and lens unit IVB having a negative refractive power. This lens system performs zooming by moving the first, second and fourth lens groups along the optical axis with the third lens group being fixed and performs focusing by moving the first lens group along the optical axis.
Arnold Bruce Y.
Asahi Kogaku Kogyo Kabushiki Kaisha
Gass Rebecca D.
LandOfFree
Telephoto zoom lens system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Telephoto zoom lens system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Telephoto zoom lens system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-37094