I'd like to do the same with my 12.5 f8. Siegried told me it is called a Pencet, I believe. If that's not right, I screwed it up, not Siegried. Is this something we could do as a group, or does someone have plans we could follow? -------------- Original message --------------
Can anybody suggest a starting point for motorizing the Dob mount for my 10-inch f/7 scope?
John R. Peterson
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Lots of references to the Poncet mount at: http://www.google.com/search?hl=en&ie=ISO-8859-1&q=%22poncet+mount%22 Patrick
If you go the platform route, DO NOT build a straight Poncet. It is unstable with large loads. Build one of the variants that does not use inclined planes, but conic sections and rollers instead. If you plan on imaging, computerizing an alt-az mount will mean field rotation must be compensated-for. If you like spending time at a computer then this isn't a problem. Using a platform eliminates field rotation. You can even use the altitude motion as true declination motion if you plan your targets when close to the meridian (best place to shoot them anyway, when they are highest). C. __________________________________ Do you Yahoo!? New and Improved Yahoo! Mail - Send 10MB messages! http://promotions.yahoo.com/new_mail
Following Patrick's note in his News, I checked out the latest Cassini postings -- and I was floored by Iapetus. Take a look at this odd view: http://saturn.jpl.nasa.gov/multimedia/images/raw/raw-images-details.cfm?feiI... That URL has the caption. Click on the picture to get a larger picture. Anyway, I'm wondering if Iapetus got smacked by a big, dirty asteroid, which left a huge dark patch on it. Best wishes, Joe
participants (4)
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Chuck Hards -
Joe Bauman -
Patrick Wiggins -
steve.nielsen＠comcast.net