Patent ID: 8059348

Claim:
A lens adapter ring configured for connecting a lens barrel to a lens holder whose thread specification is different from that of the lens barrel, the lens adapter ring comprising: a first hollow cylinder comprising a first inner surface and a first outer surface opposite to the first inner surface, wherein the first outer surface comprises a first outer thread portion adapted for the lens holder, and the first inner surface comprises a first inner thread portion adapted for the lens barrel; an internal lip positioned on the first inner surface of the first hollow cylinder; and a second hollow cylinder, wherein the second hollow cylinder comprises a second inner surface and a second outer surface opposite to the second inner surface, the second inner surface comprises a second inner thread portion whose thread specification is different from that of the first inner thread portion of the first hollow cylinder, and the second outer surface comprises a second outer thread portion whose thread specification is different from that of the first outer thread portion of the first hollow cylinder, and the internal lip comprises a thread portion adapted for the second outer thread portion of the second hollow cylinder.