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Old 02-07-2017, 02:05 PM
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Visionary (David)
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Join Date: Jan 2015
Location: Sydney
Posts: 355
J Dobson

Quote:
Originally Posted by Wavytone View Post
Sil,

OK a solution does come to mind.

1. Approach body corporate with a request to install a skylight in the roof. A bloody big one, and one that opens (from memory there is one) so you're not looking through two glass panes.

2. Aquire a large optically flat mirror, say 25-32 cm across to use as a siderostat. Set this up on a mount that sits on the roof directing a beam of light through the skylight.

This needs a compact horseshoe mount allowing it to tilt (declination) and rotate in RA to track. It could probably be cannibalised from a commercial mount, say an EQ6, with some work.

The mirror mount also needs to be motorised so in this respect a GOTO mount is probably the ideal donor to be cannibalised, and some electronics surgery is required.

3. Set up a nice scope of your choice inside, pointed at the flat, under the skylight. The beauty of this is the scope is stationary, and you're inside out of the cold Canberra winter.
Sil,

The is some footage on YouTube of John Dobson's beautiful and VERY big Camera Obscura. Upon investigation, the whole idea/concept of a large Camera Obscra is very intriguing.
With the Tech that's so readily available the Camera Obscura concept may prove to offer many answers requiring only a flexible mind!
Cheers
David
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