Making your own dob

Share practical advice and tips on making your own kit

Making your own dob

Postby thething » Mon Jan 28, 2008 1:20 pm

I did raise a query about this [url=http://forum.skyatnightmagazine.com/tm.asp?m=57469]here[/url] but never got any response.

Maybe in this new board someone can help?

Thanks,
thething
 
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RE: Making your own dob

Postby skye at night » Mon Jan 28, 2008 1:36 pm

I am assuming you are talking about mirrors?! rather than lenses.

Do science store do one big enough?

Astromart in ythe US is good for mirrors.. or galvoptics in the uk... but expensive.

Making your own mirror really would bring the cost down.

Friar Dobson uses ships porthole glass, but you can pick up blanks quite cheaply i believe.

Steve
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RE: Making your own dob

Postby sftonkin » Mon Jan 28, 2008 4:56 pm


[quote]ORIGINAL: skye at night

Making your own mirror really would bring the cost down.
[/quote]

Only for big ones; you'd be hard pressed to make an 8" or below for what you can buy one for. The main value of starting on a small mirror (apart from the satisfaction of having done your own) is to get teh experience that you need before you start a biggun!
sftonkin
 
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RE: Making your own dob

Postby skye at night » Mon Jan 28, 2008 5:46 pm


[quote]ORIGINAL: sftonkin


[quote]ORIGINAL: skye at night

Making your own mirror really would bring the cost down.
[/quote]

[color=#00FF33]Only for big on[/color]es; you'd be hard pressed to make an 8" or below for what you can buy one for. The main value of starting on a small mirror (apart from the satisfaction of having done your own) is to get teh experience that you need before you start a biggun!

[/quote]
agreed!
aluminising and coating does seem expensive and you have to factor in your own time..

There is a bit of a steepening price curve as you go up in diameter.

Steve

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