Telescope Reviews: Re: I'd like to make a binonewt telescope

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Equipment Discussions >> ATM, Optics and DIY Forum

HiggsBoson
Pooh-Bah

Reged: 02/21/07
Posts: 1118
Loc: Kal-li-fornia

Re: I'd like to make a binonewt telescope
07/03/09 09:18 PM

Consider grinding a 6” for the telescope you have. That should be doable in about 40 hours of work. You would not need to build the rest of the scope because you already have it. Pay particular attention to control of the focal length.

I suggest that you get two identical 8” blanks. Using a plate glass tool and a Pyrex blank is asking for trouble. They will not grind at the same rate when using the same tool and same grit. They may not be the same thickness and their thermal properties will not be the same. There is much to learn by completing a 6” before making your plans for your Bino.

I was in the same position a few years ago when I wanted to build a 12.5” Newt. I first completed a Pyrex 6” F/9 and learned much about telescopes. It was a thrill the first time I focused it on the Moon. As I was viewing the ISS transited the moon. This was my first light with my 6” and that feeling can never be replaced by any other scope.

With that scope complete I completely redesigned my 12.5”. I have learned many things that I would not have known just be reading books and forums. Now I have a solid design for my 12.5”. This time I went with Fused Silica 12.5” F/4.5. I am working on the parabola at this time. I have not worked on it for several months due to a new job, a new house and issues at work but I am building the scope so that it will be available for my star test.

Good luck with your project!

--------------------
Michael

ATM: 6" F/9 Newtonian Travel Scope
ATM: 12.5" F/4.5 Real Soon Now...

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Subject	Posted by	Posted on
I'd like to make a binonewt telescope	Star Gazer94	07/01/09 02:59 AM
Re: I'd like to make a binonewt telescope	Zoomit	07/04/09 09:13 AM
Re: I'd like to make a binonewt telescope	Zoomit	07/04/09 09:24 AM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/04/09 11:57 AM
Re: I'd like to make a binonewt telescope	PrestonE	07/01/09 10:18 PM
Re: I'd like to make a binonewt telescope	Zoomit	07/04/09 09:06 AM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/01/09 11:01 PM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/03/09 04:12 PM
Re: I'd like to make a binonewt telescope	HiggsBoson	07/03/09 09:18 PM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/03/09 09:23 PM
Re: I'd like to make a binonewt telescope	Vincent Becker	07/01/09 03:29 AM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/01/09 10:09 AM
Re: I'd like to make a binonewt telescope	Vincent Becker	07/01/09 03:06 PM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/01/09 07:32 PM
Re: I'd like to make a binonewt telescope	Star Gazer94	07/01/09 08:42 PM

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