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CoastalOpt f4 60mm Apo Macro - A useful tool for multispectral work

Dr Klaus Schmitt

Well-known member
There ARE ALREADY QUARTZ AND FLUORITE lens elements in this lens, but to color correct it from UV to near IR
needs glass with a very differert refractive index...

Not much happens belows 320nm anyway in biology, only combustion processes need to go down to 280nm or thereabouts.
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