high-speed rotating drum and rotating mirror camer
corneal lens(lenses) lens
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
40inches rotating blad e
45 rotating scan mirror
45 rotating scanning mirror
A rotating and a stationary disc
AC exciter with armature rotating