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RE: (meteorobs) Rich Field Refractors
Among aother things, Robert Gardner recently wrote:
> Also the air spacing on the primary may be screwed up. I no longer
>have access to a large flat, so I am waiting for a clear night and the
>time to test that and hope I can somehow separate the elements of the
>objective if necessary.
Be careful. A few years back I tried to seperate the elements of a 3-inch
Jaegers acromate by warming it in hot water, and the crown element cracked!
GWG
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