Ignore this message! My email account has been hacked somehow. I am just fine, sitting here in our Hawaii home. More later, as I figure this all out and deal...
I'm sorry for this odd request because it might get to you too urgent but it's because of the situation of things right now, i'm stuck in Wales, United Kingdom...
Top Ten Ways to Improve a Newtonian can be found here: http://home.digitalexp.com/~suiterhr/TM/Topten.htm#07 Though I have not yet tried it myself, baffling is...
I have been using a 16-inch Newtonian for the past ten years or so. I installed light baffles in the tube itself - about six of them - to try and improve the...
Hi folks I was wondering what the opinions are on the use of baffels in a Newtonian tube are they a help to improve contrast what about the thermals that are...
... Thank you Mick, This is really helpful. I will start with these documents as you suggest. I'm not in a hurry. I'm sure it will take 4 - 6 months to have...
Peter - I had a little time today so I gathered up some info for you that might help in your PLOP cell design for your 24 inch mirror: First, the URLs below...
In a message dated 11/18/2009 8:26:17 PM Pacific Standard Time, ... Peter - a picture being worth 1K words (according to legend), I have placed two pictures...
In a message dated 11/18/2009 8:03:54 PM Pacific Standard Time, ... Tim - thanks for the encouragement on the Jupiter images. These images are most assuredly...
... Thank you for the sobering assessment. Alas, I think you are right. So looking back to the "standard cell", how would one hold a 2-foot mirror laterally...
retty impressive if you ask me. Are these individual shots or are they a stack? Tim ________________________________ From: "mhholl@..." <mhholl@...> To:...
Group - I have placed three recent images of Jupiter (made using my homebuilt 10 inch f/6 Newt) in the Photos section, Mick Hollimon folder. These images...
In a message dated 11/14/2009 8:55:30 AM Pacific Standard Time, ... Peter - I finally got a chance to examine the sketch of the proposed 4-contact sling...
Peter, Rather than a full thickness mirror, consider a honeycombed mirror that weighs 60% less and is less demanding to properly mount. Had I realized this...
Hi Mick, I appreciate the insights on the hazards of slings, however I have not yet given up on the idea of a specialized sling system for an equatorially...
In a message dated 11/11/2009 7:20:05 AM Pacific Standard Time, ... Peter - I can certainly understand the concern about fully supporting a large mirror in...
Thanks for the responses, Mick; I would absolutely use software (Plop) to design the cell support points, but the edge supports (and potentially forward...
Peter, Using silicone glue "blobs" around 1" in diameter on each of the 27 flotation points of a mirror cell should properly hold a 24" mirror on an equatorial...
In a message dated 11/5/2009 10:05:29 PM Pacific Standard Time, ... Assuming the "large, fast" Newt mirror is also thin (less than 6/1 width/thickness ratio),...
Hi all, My first posting to this group. I was interested in the opinion of others with respect to the best mirror cell design for a large, fast(f/3-4)...
Mick, Thanks for the clarification. Cutting a cylinder 45 degrees is what I had in mind for my secondary holder. Best regards, John ... From: mhholl@......
In a message dated 10/22/2009 3:24:53 PM Pacific Daylight Time, ... John - glad to be of help. Mick Hollimon 22 Oct 09 6:10 PM PDT USA [Non-text portions of...
Mick, I have a big smile on my face! Thank you for the formula. I can now better proceed with the assembly of my home made scope. John ... From: mhholl@......
In a message dated 10/22/2009 2:56:45 AM Pacific Daylight Time, ... John - the major axis of an ellipse is square-root-of-2 (approx. 1.414) times the minor...
Hello, What please is the formula for determining the length of the major axis of a secondary mirror? I need to find the exact center of my secondary mirror...
... Yes 15mm is all I have to play with the mirror is 150mm O. D. OF tube is 167mm so alowing 2mm for tube thickness 15mm is all I am left with or possible...
Sorry, can't help you there, I'm a hammer and tongs (actually power saw) kind of guy. It seems that you have more resources for simple metal work like that in...
Thanks Frank for the very informative reply I like the idea of foam to act as baffels I have about 15 mm. to work with so I think it would work, cutting the...
Welcome, Pat. I had the same issue on my new-to-me 10" Discovery-built Orion PDSE Dob. I had changed out the focuser from the abysmally slow helical to an R&P...
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