So they are supplied with an interferometric report? Wow, that is cool to know how good one's lens really is!

What is the average you guarantee? What happens to the ones that do not meet your standards? Can you sell them to at lower price?

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On the 90mm the lenses in cell come from one manufacturer and the tube comes from another manufacturer. I would not really call threading a cell onto a tube assembly, but yes we do put them together. They then go through a test for collimation and will go to an interferometer.

Mike

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