About this 3D model

I love fisheye lenses, both for artistic and technical purposes, and I have quite a collection from door peepholes to high-quality fisheye lenses. Unfortunately, few cheap options give full 180-degree views, and almost none give more than 180. Here's a simple part to allow mounting an old 185-degree converter (originally sold by IPIX for use on a long extinct 1.3MP Olympus) on a 16MP Canon PowerShot A4000. _You might not have either this lens or this camera, but the mounting method easily can be adapted for many camera and adapter lens or filter combinations...._