Focal length transitional method, auxiliary lens for transiting
Front converter lens
Front converter lens system using a diffractive surface
Image magnification apparatus
Image taking optical system and reduction optical system
Imaging lens arrangement designed for low light conditions
Imaging lens device and portable apparatus having imaging...
Interchangeable lens system
Lens array imaging with cross-talk inhibiting optical stop...
Lens system with master lens system and conversion lens
Miniature fixed-focal-length lens system
Mount conversion adaptor lens
Objective lens for microscope
Optical adapter for mounting camera lenses on a video camera
Optical device
Optical magnification adjustment system and projection...
Optical systems
Rear conversion lens
Rear converter lens
Switchable magnification lens and photographic apparatus...