Thursday, 1st September 2011 at 07:25 #2763
Hi guys, I’ve managed to persuade my wife to let me make a scope. I’m going to make an 18 inch, getting the blank for christmas! So stand by for me pestering everyone for advice!! ” title=”Smiley” /> see you soon.Thursday, 1st September 2011 at 08:15 #3251
Daniel kenealyRegistered user0p
thats cool me and barry are making a 16inch scope barrys already started hogging the blank out.Thursday, 1st September 2011 at 08:27 #3252
Nice one! I think the thing that persuaded my missus, was the cost is so much lower. It’s going to be a steep learning curve, but can’t wait to get going. Just doing homework on different designs at the mo, I wonder if I should let my better half know that I can keep my 12 inch doing it this way? Better not!!Thursday, 1st September 2011 at 15:34 #3253
Just had a look at blanks, thinkin 500mm is the way foreward… In for a penny, in for a pound!!Thursday, 1st September 2011 at 18:35 #3254
Tell your wife that the 12 inch is going to be the finder scope.Friday, 2nd September 2011 at 13:38 #3255
What F ratio you goin for Austin, now that you have decided on a 20″. Dont say below F4 ” title=”Smiley” />Friday, 2nd September 2011 at 18:26 #3256
Graham BellRegistered user0p
You’ll have to put some pics up Austin as you build. Should be a good project to watchSaturday, 3rd September 2011 at 14:41 #3257
Certainly will do, it will be a while before I start as i’m getting the blank as a christmas prezzie! Plenty of time to collect bits and bobs needed for the build though!Tuesday, 6th September 2011 at 07:42 #3258
JULIE ORMONDERegistered user0p
Our astronomy group ahve been taking about making our own scope but the costs of the mirror put us off…though we still hanker to do it.
Where did you get your mirrror and how much did it cost?
We were thinking of a retractable scope with the rods so it could come appart easily….at least that was/is the dream.Tuesday, 6th September 2011 at 09:56 #3259
Hi Julie, we actually make the mirrors usually out of 1″ plate glass as this helps keep the cost right down, details and pics can be found here
BrendanWednesday, 7th September 2011 at 12:17 #3260
JULIE ORMONDERegistered user0p
It looks amazing…was it hard to do the mirror, and how did you overcome flaws in the mirror. In other words could we do it, though we’d never made one before, or should we try polishing a small mirror first? The telescope looks like a real crafmanship job…great work! I’ve always had the idea that making your own telescope would really tune you into how a telescope really works…but I suppose you could say that about anythingWednesday, 7th September 2011 at 12:55 #3261
Hi Julie, there are lots of pro’s and con’s to making your own mirror, making a smaller mirror first would help, doing a large mirror at such a short focal length did pose many problems not least testing the figure. There are many books available on mirror making but one of the best is “The Dobsonian Telescope” by Richard Berry and David Kriege.
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