Hi Noe that a lot of people would be changing over to Digital Seting Circles,is there any one who wants to dispose off/give away his manual setting circles? ...
... * A good idea, but hard for someone whos never built a tele scope at all. ... M101 ... M51 is easy in a 6" :) Anyway, only you can decide. If your happy...
I'm looking for a way to print circles for RA and DEC on a GEM. I finally found a few programs written in the old BASIC, but I'm not sure I can figure it out...
... with ... the high ... then ... stig. Then ... Mel The best I could get to was about 2-3 waves. When I initially ground this blank the tabletop was...
... I rotate the mirror blank that's on the bottom every 10 minutes and rest the mirror blank on something soft. This formula has worked great for me for a ...
... ground ... rest the ... for a ... Thank YOU! I have a few 5.25 and 6 in. milky Pyrex blanks and wondered about that. I understand that you have a cushion...
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the atm_free group. File :...
atm_free@yahoogroups....
Oct 15, 2007 1:42 am
11299
Greetings, Rick Swenson has pointed out that I have made an error in my Spherometer Spreadsheet so I have corrected the error and posted a new Spreadsheet in...
Hi Dave, Before you go through the trouble of re-grinding, you might want to consider re-polishing your thin 16" mirror back to a sphere and working on the...
I plan to make a F=30 mirror but eavery body tel me it is a difficult entreprise soem of you maybe have recommendation on howto it is about 24inch size 3\4 ...
... by ... the ... John, I'm sneaking up on the figure of my 10 inch F4.9. The lap is acting a little harder than it should so I may still be a week or so ...
is it possible to see how it look like if we take a target like tv target or like test sheet for photocopier or simply a 1\4 square diseing paper and place...
There is a similar way and it is described in the book by Richard Suiter called "Star Testing Astronomical Telescopes". In that book he describes a similar...
Dave, I would recommend that you polish the optic back to a sphere using your standard setup. Repolishing the optic will only slightly reduce the total amount...
http://home.comcast.net/~doeason/Surface_images.pdf 1meg file. This mirror has a surface similar to one that Texereau shows in his book where he states it was...
... reduce ... ROC. ... both ... an ... note, ... Hi John, Surprisingly the edge of the mirror still looks good. I don't have Texereau's book so I will...
F/30 won't look very different than a flat! I THINK that a low power telescope of small aperture may help for knife edge or Ronchi testing. A bright light to...
... f/30 implies a focal length not a diameter. If you are intending to build a 30" mirror for your first mirror, I would strongly recommend against the idea....
I used jetinck cartrige to made my artificial star you only have to used a hole on the head of the cartrige HP 540 for exemple or HP 51625A you have a very...
This company... http://www.galvoptics.fsnet.co.uk/telescope4.htm ..offers grits only in the sizes: 180, 400, 303. And, recommend they be used in that order. So...
I plan to make falt whit 1\4 plate glass whit the method of A B C waht kind of grits do you recommended for start jack 47'N71'O here is a table of grits for...
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