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Diamond cuts remarkably fast. You can probably use it as-is, even with those big gaps. Might as well try it!

That is aluminum oxide sheets, no?

The Thorlabs site has 10 sheets for $13, $1.30 a sheet.

Sometimes I get weepers if it's too sharp.

Some canvas stropping usually drops it into the comfort zone.

The aluminum oxide stuff works just as well, but definitely will not last as long.

Here's the progression at 200x:

5um
3um
1um
0.3um
0.3um "Seriphied" (tm) edge:nj

I just ordered some of the alum oxide sheets from here to see how they compare to the diamond. 5um, 3um, 1um, 0.3um

It appears that there is a Japanese distributor? I know my collegues in Japan get Thorlabs stuff. It's not as cheap as it is here, but tey get it.

I order stuff for the laser lab from this place. The shipping is incredibly fast.

I just looked, and they now carry diamond lapping film, not just the aluminum oxide stuff. 6"x6" diamond film for...