This image shows the surface of a labeled Dark Blue Escher that’s been lapped and used quite often. This is a harder Escher, and it is quite fine. I’d put this up against any green version any day.
The reference scale is approximately 1.0 mm in length, and each bar is approximately 10µm in width.
Objective – Neo Splan 5x
Relay Lens – 2.5x
Illumination – Reflected Darkfield with Off-Axis Fiber-Optic