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Help With Newt Software - 2" Focuser Vs. 1.25"

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Posted by Martin on May 19, 2001 13:14:51 UTC


I just bought a 10" f/5 primary mirror. So now I'm planning on building the telescope. But since this is my first homemade telescope ever, I have a few questions.
I used the program Newt to decide wich size I should have on my secondary mirror and soon concluded that I would need a Low profile crayford focuser or something else low profile (Any other ideas? I want to have wheels to turn when I focus) When I run the figures through the program it asks me if I have a 1.25" or 2" focuser. I kept writing 1.25" since I will be using that size of oculars to begin with. But then it hit me! Do I really need to use a 2" okular to be able to take advantage of a 2" focusers advantages? I mean the light will have a little more room to pass on the edges before it hits the front end of the ocular and on first thought, wouldn't that help me?

Allso does anyone know of any good focusers 1,25" or 2". I don't won't to spend more than around $150. or any sites where I could get not to expensive accessories?

HOpe to hear from someone soon, since I need to order the mirror pretty soon if I should have it in time for my short vacation.

Clear Skies!

I'm Swedish so I hope you can cope with the spelling misstakes :)

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