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Use tape on the backside to hold it down to your surface.
Underneath the picture area I use white copy paper for a clean backdrop.
Turn the light all the way up.
Take your time
The real secret is getting the scope to show your flaws instead of a washed out picture. Its capable of showing a great amount of detail but it takes work on your part. Taking pictures doubles or triples the amount of time I spend sharpening.
Am not sure if its applicable, but on the stage on the metallurgical microscope I use, I keep a block of polystyrene weighted down with a steel bar. The objective to the stage is dead 90*, so I just stab the blade into the block at whatever angle I need to get as much of the edge in focus at the same time. This is also a very good method for determining the real apex angle after stropping procedures or just freehand sharpening. A white background underneath is a good idea, or can use a small flashlight with a cloth etc draped over it. Backlighting the edge is a great way to increase usable depth info, especially at higher magnification.