I can't seem to see the problem in this image though, I must be biased !
Yes or maybe I just deactivated the bump for that render
The bump I tested is fractal > bump2d > indigoShader
Normals are okay and I'm running Indigo for Windows, without subdivisions for now.
I'm using a single texture file for several elements, and apparently the exporter only bakes one (with the corresponding area of the texture).
The result is one of the lens rings with the fractal bump, and the others with random bump straight lines.
What I would need I guess is a single baked bump texture covering all the area, that Indigo would use for all the elements of the lens, as I'm doing for the diffuse texture.
Anyway, as for the instances it's no big deal for now, because it works just fine with a file node bump,
and I'm probably gonna use a file in the end
Here are the renders, with the baked bump on the right.