Coplanar, meaning this ring can marry a 58mm thread and a 52mm thread with no added length - the threads are all internal.
What wide angle conversion lenses are compatible on the G12, G11, G10?
There are only 2 wide angle lenses that we can recommend for use with the G10/G11/G12s built in lens. The Nikon WC E75 52mm requires our Part A tube adapter (the newer version, the Nikon WC E76 is a poor match) and our custom 58-52mm coplanar step ring, or the Olympus WCON 07 55mm which requires our Part A and a 58-55mm step ring.
Both these wide angle conversion lenses can only be used at full wide - the cameras lens is almost touching the rear element of the conversion lens, so there's no room for zooming.
Addendum: The Nikon WC-E75A seems to provide good IQ on the G10/11/12.
It has a proprietary thread (~51mm) that only fits the Nikon UR-E22 lens adapter (for P7000/7100). If interest warrants, we may have a custom step ring machined.
