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Lagoon and Triffid Celestron C6 Hyperstar4

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Posts Made By: dan gieruszak

August 11, 2004 01:04 PM Forum: Telescope Making

Re: Cooler than ambient?

Posted By dan gieruszak

If I understand this thread correctly, if you had a primary box of aluminum painted flat black, it would cool very rapidly, the primary and would always radiate heat to the box - this might aid in getting the primary close to ambient - but the box would probably have significant dew problems.

Are there other problems that a flat black aluminum primary box would cause?

Clear skies,

non alien Dan

February 23, 2008 04:15 AM Forum: Telescope Making

Hubble Optics Cellular Mirrors?

Posted By dan gieruszak

I believe the prices they used to quote was an extra $500 per half F ratio faster than F5. NOt sure what they are quoting now.

See Normand Fullum's web site for fast large fused mirror.

Lots of discussion has taken place her, on CN and I think Yahoo big dob ... but nobody seems to have star tested a large HO mirror.

I just moved up to 18" F4.5 from 16" F4.5 but I'm still looking for larger aperture at a reasonable price... and waiting to see what HO will deliver.

Love the aperture you are with ... smile

Dan

Dan