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Scratch pattern when sharpening

I work in the semi-conductor industry where the plus and minus of measurement is 20 nano-meter, so I am used to seeing hi-mag images

But please help my understand these images to discern the differences of edge sharpness
At 500 mag any knife edge will look like a mountain arete
 
neeman said:
I work in the semi-conductor industry where the plus and minus of measurement is 20 nano-meter, so I am used to seeing hi-mag images

But please help my understand these images to discern the differences of edge sharpness
At 500 mag any knife edge will look like a mountain arete
Click to expand...

I don't agree, but I do like the word "Arete"

photo_rochefort.jpg
 
neeman said:
Any takers to explain the high resolution images of the knife edges?
Please....
Click to expand...

Am not sure what needs to be explained, but am game if you can narrow it down a bit. An interesting side note would be to include pics of common materials at the same magnification so the possible interactions between materials and different edges might be more apparent.
 
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