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I don't disagree with any of that. But the glass in question was not a regular and uniform dished shape. If it were it wouldn't be as much of an issue, agreed. My main issue is I like to be able to...

Although I see where you're both coming from, not really in this specific case, as the amount that the "bad" glass plates were out of flat was far more than the thickness of a sheet of paper. Mine...

Now you're making me chuckle. Chortle even.

Seriously? First, no one is claiming to be smarter than anyone here except I guess you. Knowing something that someone else doesn't does not make a person any smarter than any other, only more well...

Have you ever even lapped a piece of glass to use for lapping film? Have you even checked a few to see if they were reasonably flat? I thought not. Maybe you should limit your utterances to subjects...

That is not true in many cases. I have had pieces of glass that look like motocross whoops. They need to be at least fairly uniform and without abrupt dips and/or twists or you will really mess up a...

Yes, that is true if you do your full progression on film. But I thought the question was whether it's getting flat, not does it need to be.

I believe that the point he is trying to make is that if the item being flattened is larger than the item doing the flattening you probably aren't getting it flat. He would be correct. I tried the...