Zoom lens barrel for macrofocusing

Details Zoom lens barrel for macrofocusing Zoom lens barrel for macrofocusing

1983-07-01

1985-06-18

Corbin, John K.

G02B 710

Patent

active

045238154

ABSTRACT:
A zoom lens barrel capable of macro-photographing, having lens assemblies with a focusing lens assembly has a mount ring, a zooming ring and a focusing ring. The barrel further comprises a guide means between the mount ring and the focusing ring for enabling the focusing ring not only to rotate for normal photographing, and for macro-photographing, but also to move in the axial direction, a connecting ring which rotates to move only the focusing lens assembly, a macrohelicoid ring which rotates to move the whole lens assemblies while maintaining a predetermined spatial relationship therebetween, and a switching means for selectively connecting the connecting ring or the macrohelicoid ring to the focusing ring in accordance with the axial movement of the focusing ring.

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