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48" Dob

  • michaeloconnell
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16 years 8 months ago #65854 by michaeloconnell
48" Dob was created by michaeloconnell
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www.opticalmechanics.com/48Dob/index.html

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16 years 8 months ago #65855 by Petermark
Replied by Petermark on topic Re: 48" Dob
That thing would need planning permission in Ireland !
Not to mention a big shed!
Mark.
Anybody who says that Earthshine is reflected Sunshine is talking Moonshine.

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16 years 8 months ago #65856 by dmolloy
Replied by dmolloy on topic Re: 48" Dob
impressive scope, I don't believe I could fit in the back of the car. I suppose it's destined for an observatory. :(
You could use your 16" for a finderscope :lol:
anyway I bet the views are jaw dropping under the right conditions.

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16 years 8 months ago #65857 by dave_lillis
Replied by dave_lillis on topic Re: 48" Dob
wow, so, when are you buying the flat bed truck for it Michael ? :lol:
Dave L. on facebook , See my images in flickr
Chairman. Shannonside Astronomy Club (Limerick)

Carrying around my 20" obsession is going to kill me,
but what a way to go. :)
+ 12"LX200, MK67, Meade2045, 4"refractor

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16 years 8 months ago #65858 by philiplardner
Replied by philiplardner on topic Re: 48" Dob
Yeah, I've been following this on the ATM list - impressive! There are a number of amateur built monsters out there (up to 42") ground and polished by DIY machine and figured by hand. Also some impressively thin mirrors being made. One guy made a 16" - 20" (I forget which) by 1/8" thick to see if it could be done and to test the limits of wiffle-tree support. It worked (within limits!)

Phil.
www.theochranorthobservatory.blogspot.com
www.theochrasouthobservatory.blogspot.com

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16 years 8 months ago #65861 by Seanie_Morris
Replied by Seanie_Morris on topic Re: 48" Dob
Very impressive. However, the one thing I don't like about such large Dobs (if I was lucky enough to have one) would be the exposed mirror. For such a large area of a sensitive part of the instrument to be exposed like that would worry me. I guess the truss part could be wrapped with some sort of cloth?

Seanie.
Midlands Astronomy Club.
Radio Presenter (Midlands 103), Space Enthusiast, Astronomy Outreach Co-ordinator.
Former IFAS Chairperson and Secretary.

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