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Roughly speaking, the typical angle at the edge is about 16 degrees. It's set by the ratio of spine thickness to blade width. I _think_ it's about the same for wedges as for hollow-ground blades...

If you can get a good (comfortable) shave with a DE razor, your prep is probably OK. Especially if you can do an ATG pass with the DE.

The straight razor needs to be as sharp as a DE blade, and...