This began as a doodle today. The model is currently just over 9600 verts, and has 4 cycles materials. I was surprised to discover that these opera glasses actually magnify! These are based on this set of actual opera glasses, though they aren’t exactly to scale.
I like it, specially the materials. But the lenses seem a little bit weird to me. In the reference image there’s a space between the lens and the circle ornaments, and they also seem to be flatter.
The lenses are pretty strange in that render. I ended up doing some more work on the lenses, after a comment I received from someone on Blendswap - they were trying to use them for a project, and needed the magnification. After your comment, I also added a bevel inside the ring that holds the lens in place. I think the result is more appealing. Good call.