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Posts posted by Pablito

  1. Peter, as stationary scope it's not a big deal. I wish to achieve not more than 100kg and if I get under 80kg I will be delighted. Mirror weights ca. 40kg so have another 40kg to put into the structure. It will be portable scope but I can't sacrifice stability to get it lighter. Some things just have to be heavy... We will see, hope it will be lot of fun not a frustration :)

  2. How heavy is your 30"?

    This 22" weights ca. 65kg in total. For me it's still too much but there was no intention to loose weight. Had no time to do it and my customer didn't  mind it. I am during making 24" structure and I already make it lighter where I can. I use three layers of plywood (4mm+12mm or 15mm+4mm) and in 12/15mm I make holes, after giving 4mm from both sides it's lighter and still stiff. Much more work but result is great :)


  3. Hello again after longer break :)

    Finally I had a chance to do focusing test yesterday. Everything is perfect, no need to cut and now I can  put a black paint on the poles. Good balancing and scope is moving smooth. 

    Street lamps flashed straight into the dob (don't have light shroud yet) but M57 was still very nice :)



    • Like 4
  4. Ok, have pics :)

    Unfortunately I dont't have all the poles ends so I can't fiinish the dob. Still don't know how it happened... I have them somewhere but found only two... Will have new set in the end of the week ;)

    What's left to do? Attach pole ends, balance the scope, fix side bearings, but first of all - some lathe work with knurled bolts. Have to take some thread off to fit my design. Will show it when it's done.

    On one photo I shown linear bearing (inside primary box). I have string edge support for the primary and it will be fixed to linear bearings, During collimation primary will change it's position as well as the string. It will reduce astigmatism to minimum.

    Take a look ;)









  5. Thank you :)

    Yes I have a progress and I am goint to finish it in a week. I had some brake in making but I got back to it two weeks ago. I am finishing secondary cage today - painting spider and flocking it inside. Plywwod is painted and looks awesome ;)

    Will post some pics soon.

  6. I only say what I saw. I was observing at two StarParties through "twin mirror" in a scope I made last year to my friend. He has Ethos eps, coma is visible but do not hit eyeballs ;)

    Lot of people was looking through it and no one complained on coma. More other nice things were visible ;) Best M13 I've ever seen...

  7. Thanks :)

    Conditions were quite poor and I had a little problem with focusing the image. Late afternoon is not good for solar imaging as well as cirrus clouds. I usually take pics earlier but after 5 months of break, I couldn't complain ;) The result is better than I expeceted :)

  8. Hi,

    Some time ago I started with new project - 22" F/3,75 dob. I have optics from my trusted maker. The rest is in my hands :)

    Almost all work with plywood is done. Side bearings are partially prepared (two 12mm layers). Have to admit that octagonal style requires much more work than standard cube...

    Next step: mirror cel. I have laser cut parts for 27 points cell. Tomorrow I will weld the frame for it :)








    • Like 7
  9. Thank you guys :)

    I have a bomb! I ordered three mirrors today - 24", 30" and 32". Will be ready next year (spring-summer) but I think the time will go faster than I expect.

    I don't know if to mention about two quartz 370mm because these tiny scopes could work as finders ;)

  10. Moonshane, I will put some pics later. I base on CNC machined parts to have everything with proper accuracy. I am also making other 16" dob so I will show you how it may look.

    I have trusted mirror maker here in Poland, he make awesome mirrors. I had F/5 mirrors with accuracy at L/12-L/16 range. The best he made for me was L/27!!!

    I have another 22" mirror (under my bed ;) ) with L/8 accyracy but with F/3.7 ratio it's still great. In general the slower the mirror, accuracy is better.

    Paracorr should be used, I think there will be no choice even with Ethos eps

  11. It's not very heavy. I predict it weights ca.40-45kg. It still can be moved by one (not weak) person but it balaces on the edge. Primary cage with mirror weights not more than 30kg and I am able to take it alone. Two persons are preffered to install it but not necessary ;)

  12. Sorry Pablito, not quite sure I understand the question

    I only wanted to say that there are ways to make fully automated DSC with hi-res encoders without breaking the bank. I made a couple of sets with USB or BlueTooth connection that work great with PC, Palm or iPhone :)

    But I will understand that more fun you have finding objects using this kind of mod. I know people who don't even want to hear about go-to or DSC and and say that those who use electronics should burn in hell ;)

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