Focusing aids

Introduced: September 1968

Full Title

Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras > Focusing aids

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

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G03B 13/20 Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera IPC+CPC Available in IPC and CPC
G03B 13/24 Focusing screens IPC+CPC Available in IPC and CPC
G03B 13/30 indicating depth of field since 1990 IPC+CPC Available in IPC and CPC