ideal; index of refraction values can vary by as much as 0.0003 or more from catalog values, and dispersion can vary slightly. These changes in index and dispersion can sometimes be enough to affect the lens focus location and imaging performance in highly corrected systems.

The lens blank manufacturing process is as follows:

#The glass batch ingredients for a desired glass type are mixed in a powder state,
#the powder mixture is melted in a furnace,
#the fluid is further mixed while

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