I see, that would be one expensive element ! I just found it odd they would use MgFl ( transition .12um - 8um) in a visual.The lens must be superb.
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Originally Posted by avandonk
Yes it is a single crystal of Magnesium Flouride 107 mm in diameter. It is easy to test this. Just shine a green laser pointer down the lens and the scatter from the laser beam disappears completely as it goes through the MgFl. There are no impurities or refractive anomalies to scatter the light. MgFl is isotropic if that fact helps.
FPL 51 and 53 glass is a mixture of MgFl and glass. I will leave it to you to work out what is better. Low spectral dispersion is the game.
Bert
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