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Thread: UK Amateur Astronomy Group

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    Default UK Amateur Astronomy Group



    UK Amateur Astronomy Group

    UK Astronomy Group

    Includes a calendar of events, a meet up group discussion board, and more!

    Click Here to Join:
    http://www.astronomyforum.net/group....oin&groupid=60

    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Has anyone any ideas as a material or method to use on my Home made Portaball DOB as when it reaches about 10 degrees above horizontal it freefalls? Otherwise it moves very well. It should be finished by next weekend as I finishing the painting and need one moomlit night to finalise the collimation. At present I use PVC Cable as a friction material seated on a metal ring. I could add a weights but would prefer to keep the weight down.
    It's a 10.25" f5.8 with a 44mm /17% Obstruction. I only fitted the secondary mirror last night. It willbe almost a year since I started. If anyone would like to make one then I may be able to help. I did not make the optics.
    pkirk70 likes this.

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    The secondary mirror for my Dob is (1/10 wave from Orion Optics) The main mirror is 1/5wave or better it was made by an Astronomer who has made many mirrors over the years and I bought it for a bargain price.

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    Have made a Portaball Type Dob. When it reaches about 10 degrees above vertical is goes into freefall otherwise it moves quite well. The ball is not perfectly spherical, it sits on a ring of PVC about 4mm wide and 260mm dianeter. Any ideas how to rectify this.
    The secondary mirror for my Dob is (1/10 wave from Orion Optics) The main mirror is 1/5wave or better it was made by an Astronomer who has made many mirrors over the years and I bought it for a bargain price. The scope is 10.25" main mirror and 44mm secondary mirror with 3 curved spider vanes. The only views so far are with a 20mm secondary mirror fitted. These were pretty good as good as my meade ETX 125. I have just fitted the 44mm Secondary mirror which is as small as you can use with the main mirror(f5.8 260mm) Combined with the curved vanes which show no distortion on the image. The stars are sharp points of light. Theres more colour in the Pleiades than with my ETX.
    It's taken me almost a year from start to finish.
    If anyone would like to make one of these I may be able to advise. It's been a learning process all along the way.

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    Default Re: UK Amateur Astronomy Group

    Anyone notice the letter T missing from the logo? I am willing to help if a new logo is needed

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    Default Re: UK Amateur Astronomy Group

    Hi Graham in Kent - anyone here also from Kent ...am in TN2 ...

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    Default Re: UK Amateur Astronomy Group

    Hi Graham here...newbie.
    Got a Skywatcher 300P and need some advice on eye pieces...

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    Default Re: UK Amateur Astronomy Group

    Just to add have following 1.25":
    Super Plossl 10mm, and Ostara Astro 10 mm 70degree
    Moon Filter

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    Default Re: UK Amateur Astronomy Group

    So when and where do we arrange meetings ?
    11" edgehd Cge pro, takahashi fsq 85. To many filters and things to name, favourite being 31mm luminous and mk3 Baader zoom. Astro modded canon 6d and zwo 174

 

 

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