GX680 65mm wide angle - missing part?

Simon Benton

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Joined
Feb 14, 2007
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724
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Arnprior Canada
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I have obtained a 65mm f5.6 Wide Angle lens for my GX680 and I think a part must be missing from the front - maybe the threaded ring that holds filters? Can anyone confirm this and does the part have a technical name. Or is there a lens hood that screws in here?
 

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Simon Benton

Subscriber
Joined
Feb 14, 2007
Messages
724
Location
Arnprior Canada
Format
Large Format
Mystery solved. In the filter thread part was screwed this additional ring with its own external thread. It was screwed in very tightly but I managed to remove it - I have no idea what its purpose was. Thanks for all the suggestions.
 

Aja B

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Joined
Dec 1, 2010
Messages
130
Format
35mm
The adapter piece you removed is referred to as a step-down ring. It permits mounting a filter with a smaller ring size (e.g. 77mm) onto a lens whose filter ring is larger (e.g 95mm). The ring-size steps down from lens to filter. (Notice the potential for vignetting.) A similar adapter, and the preferred scenario, is to use a step-up ring (smaller lens ring-size to larger filter ring).
 
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