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Hi Barry,
I assume the depths you're quoting is where you are measuring the total depth of the curve, edge to edge of the blank?
If so, you are currently at f5 and need 5.2mm to get to f3. 6mm will give you f2.5.
Now that you have that curve, you can glue a full set of 8mm tiles to the first batch. You need long strokes to hog out the centre.
f3 is a deep soup bowl to parabolize on your first mirror.
Good luck
Joe
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