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Old 23-09-2015, 07:50 PM
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OzEclipse (Joe Cali)
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Join Date: Jun 2012
Location: '34 South' Young Hilltops LGA, Australia
Posts: 1,460
Glen,

I agree that the refractive index difference won't affect focus. But why Argon, nitrogen gas is cheaper and just as effective.

Joe
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