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azzythehillbilly

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About azzythehillbilly

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    Nebula

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    Sud Asie
  1. What I wanted to determine was whether it is worth the effort to go overboard and have a 6/9/12 or some such point support. I , like everyone else has only so much time to devote to a single hobby. I have several others. I just want to be reasonable. I think I have two questions. 1. What kind of mirror support does the Jhumell 10 inch have? Can I have some pictures? Might be just the thing to copy. ( A bit of reverse plagiarism might be OK) 2. Which is a better 3 point support structure, easy to align and will hold a colimation decently? Thanks for all the help guys. The replies have helped me steer in the correct direction.
  2. I am in the final stages of completing my DIY 10" GSO mirror based Newt. After starting to build a 9 point whiffle tree and all the problems attendant, I was wondering if the mirror ( 10", F5. BK4, 35mm thick) could be laid over a flat 1" thick fiber plate with three bumps where the 3 point supports should be. Is it really necessary to have a 9/12 point whiffle support? Am I just gilding the lily? I want to use my T'scope for visual and occasional photography with a P & S. My own calculations, with a bunch of simplifying assumptions, using my (rather rusty, I graduated from engineering college in 1970 ) education of ages past, seems to indicate that the max deflection at the edge with a single support in the center is less than .15 wave length at middle of the visible spectrum. But might be wrong. I just want to get this finished so ready to drop some niceties for the sake of progress. Earlier I had to go through tortuous affair of selecting one of the two diagonals I have. (50mm vs 73mm). Some empirical testing indicatioed no visible difference. Perhaps the same with the mirror support. I do thankfully look forward to some candid advice from those who know better than I do. This my first project ever so I am a bit naive. Azzythehillbilly
  3. Am I the only one to notice a face looking eastward at 11 o'clock from the center? Nice photograph by the way.
  4. I have uploaded the pictures of the mod to my album <azzythehillbilly's_Album > but the post says "not found". Can they be seen by clicking on the missing image place keeper? Someone kindly tell me and/or guide why! Azzythehillbilly
  5. azzythehillbilly

    azzythehillbilly's_Album

    my trial of astigmatism correction at the filter location
  6. Hi guys, I got the corrective lenses completed and returned on Saturday by the optician. He cut two lenses, one in coated plastic and the other in glass. I have checked them both. incidentally the optician failed to mark the axis. I therefore tested them by rotating the eyepieces. I tested them with the 20mm and 30 mm eyepieces (with my 650mm Newt i.e.,. Mag. of 30x and 20x). I screwed the lenses on to the bottom of the EP and looked at the nearly full moon. The moon was the only object I could see as the sky was cloudy and has been cloudy here for the last four months, non stop. It appears to me that the corrective lenses do work. To make a fuller test I would need two eye pieces, with and without the correction, but haven’t. The weather here has been terrible for the last four months , no day without rain and no clear nights. As soon as I can see a star I will test again with the star, or some nebula. The lenses are curved (meniscus), like the usual opticians glass blanks so I will ask the opticians if he can arrange flat blanks. I wonder what effect swapping the sides. I have set the convex side towards the reflector. Till then I will not pass my final judgement. As of now this method seems to work quite well. Practically speaking, my better half needs her own eye pieces as it is not convenient to repeatedly screw/unscrew the filter each time we swap eyes. Azzythehillbilly
  7. Hi and Thanks Stargazer_00, username , ronin and alan potts. All that was useful. Yes Alan, that crossed my mind. If It was possible to correct for astigmatism this way why would not teleview do just that. But could be some other reason such as convenience of use etc. Or just plain marketing hype I guess I will just go ahead and have the filter modified by the opto. In any case he wants only 2/3$ for the job and if it does not work I can try a different diopter power. I will report back the result in case it might be of use to others. I have checked to find that I have 4 or more fiters I do not need/use so if the idea works can have one for each of my low power eyepieces. Bigger problem is the cloudy skies for the last two months, not a single useable day. Thanks again Azzythehillbilly
  8. I am even more confused than before I started to read this thread. Azzytyhe hillbilly
  9. Hi all, I have astigmatism of both eyes . The extent is +0.5 diopters. I have noted the availability of the dioptrx astig corrector, which is a lens, that is attached to the top of the eyepiece . It has the value of correction equal to correction required by the eye. I happen to have about 10 pcs of 1.5 inch filters of which I am not using several any more. My optician has told me that he could replace the filter elements with 0.5 diopter corrective lenses. However these filters would screw into the field end of the eyepiece, unlike the dioptrx which sits astride the eyepiece on the "eye end" I am wondering if it will work the same way or is there some subtle difference such that some other value of power (diopter) would be needed as the correcting lens will now sit on the opposite side. If the power needed is some other value that i can estimate i can get that too. The optician does not require me to present a prescription, just my word. Would highly appreciate any guidance. Azzy
  10. HI Fellas, Greeting to all. I am a new member (and a newbie). I recently acquired a vixen 130SF and have had (along with my spouse) some great time gazing at the sky. My interest seems to be growing and I seem to be on the way to acquiring an (old, discarded?) Apogee AP2 cam. I understand that it needs an ISA I/F card to make it go. Does some good samaritan know something about the parallal interface this cam uses. If I know the way the hardware/software works I might be able to make a microcontroller emulate the custom ISA card (whatever that is). Or is it some sort of a generic ISA card? I am 65 and retired and don't believe I will be able to afford to buy something from Apogee looking at the "astronomical" prices they quote for their stuff. If it is available. I have not seen it for sale anywhere. I have been tying to put this in a new thread without luck. Wouold be grateful if admin will start a new thread for me. Azzy
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