For vario focal lens f’=200-300mm, it is used for dental microscope, and f’=200-400mm for ENT microscope or colposcope.
For both vario focal lens, we could provide the screw with M51 X 0.75, M47 X0.7, M47 X0.5, or any other screw for your microscope head.
Our vario focal lens are designed with the technology of Apochromatic aberration, processed with multi-layer film coating, it is pure transparent.