Thanks for the information.
What is a foolproof way to ensure your microscope/camera is perfectly plumb over the apex of the blade so that your not introducing skew that screws up the exposure measurements?
This one has me stumped, especially with a miceoscope with less than 1 mm field of view. It's hard to be sure that you're perfectly plumb, but it has big implications for accuracy.
It's probably something obvious, but this has me stumped.
Here is a good example of why it matters. Here are two consecutive photos from a brilliant review of the Timeless Slim. Same razor, with the same blade, same photographer, 5 minutes apart. I added the red shave plane lines. The first obviously shows negative blade exposure. The second appears to show 0.15mm blade exposure. The listed blade exposure is 0.05mm. Obviously the first pic is bad, but you can see how bad the error can be in a worst case scenario. The second picture doesn't look that bad, but makes exposure measurements off by 300%.
Here is a pic of the Slim from Timeless website that clearly shows negative blade exposure on a razor listed with 0.05mm blade exposure!
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