摘要 |
The body of a filter holder carrying a filter has a slot in which an engaging member is disposed for rotation between first and second positions in response to rotation of a shaft to which the engaging member is attached. In a first position of the shaft, retaining means on the engaging member is retracted within the slot for effecting insertion of the holder into a lens barrel. In a second position of the shaft, the retaining means projects from and is engageable with the lens barrel for retaining the body thereto.
|