a pillar lens with a hole

corneal lens lens

corneal lens（lenses） lens

Lens-to-lens interval

object lens objective lens

objective lens object lens

plane-concave lens (=plano-concave lens)

plane-convex lens (=plano lens)

short focal length lens (=short-focus lens)

variable focus lens vari-focus lens

vari-focus lens variable focus lens

room and pillar method with artificial pillar and bolting

1CU lens

35mm Multi Focal Points Lens Shutter Cameras

35mm Single Focal Point Lens Shutter Cameras

aberrated lens system

aberration of lens

absorption lens

absorptive lens