Filter thread

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Glossary Terms

The Filter Thread or Filter Ring is a threaded section inside the front of a lens to allow accessories such as filters and lens hoods to be attached.

Common filter system

System type thread description
Contax G screw 46mm except 16mm and 21mm lens
Fuji GX680 screw 82mm
Leica snap on A36 early
Leica screw 39mm late
Mamiya RB67 screw 77mm
Nikon F screw 52mm
Olympus OM screw 49mm
Pentax screw 49mm
Pentax 6x7 screw 67mm