CPC Subgroup
G03B 13/18 Focusing aids
Full Title
Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras > Focusing aids
3 direct subcodes
Child Classifications
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- G03B 13/20 Rangefinders coupled with focusing arrangements, e.g. adjustment of rangefinder automatically focusing camera
- G03B 13/24 Focusing screens
- G03B 13/30 indicating depth of field