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Posts Made By: Bill Barrett

January 22, 2004 02:34 AM Forum: Telescope Making

Rotating focuser for refractors?

Posted By Bill Barrett
Is anyone making a rotating focuser for refractors? It sure seems like a great idea. thank you, Bill

February 6, 2004 05:10 AM Forum: Telescope Making

Can anyone recommend a source for lens cells?

Posted By Bill Barrett
We are a small group about to build our first scopes (refractors). We have some loose lenses, but need a source for the cells to mount them in. If anyone could steer us in the right direction, it would be appreciated. Thank you, Bill

February 8, 2004 06:50 PM Forum: Telescope Making

Zeiss f5.6/300 lens?

Posted By Bill Barrett
I have just been given a Zeiss F5.6/300 lens. It is mounted in a Zeiss lens cell. I have no idea what it came off...I don't think it was a telescope. I'm not sure what the F5.6/300 actually refers to since the lens appears to be right around 80mm. Any info. would be greatly appreciated.

February 11, 2004 05:24 AM Forum: Telescope Making

Is there a source for a 4 1/4" id tube?

Posted By Bill Barrett
I just got an old Jaegers refractor and the tube is in pretty bad shape. Does anyone know of a source for a 4 1/4 inner diamter refractor tube? thank you, Bill

February 16, 2004 04:19 AM Forum: Telescope Making

Use schedule 5 or 10 al. pipe for optical tube?

Posted By Bill Barrett
Has anyone used schedule 5 or 10 alumimum pipe for making an optical tube?

February 17, 2004 03:26 PM Forum: Telescope Making

Adapting focusers for refractors

Posted By Bill Barrett
It seems like there are relatively few aftermarket focusers for refractors. I was wondering if an aftermarket reflector type focuser could be adapted by milling flat the base plate, then making and mmounting it to a new end plate in the refractor?

February 22, 2004 02:54 AM Forum: Telescope Making

Has anyone made a break down refractor?

Posted By Bill Barrett
I have a 4" F15 lens which needs a home, and I was thinking of making an OTA which breaks down into three sections. It would be portable and the parts would thread together. Maybe I haven been looking in the right places, but I haven't seen one before. Is there any reason not to try it? thank you, Bill

February 26, 2004 03:33 PM Forum: Telescope Making

A beginner's question. Determinig focal length?

Posted By Bill Barrett
I have recently been given several lenses of unknown focal lengths. Could anyone tell me a practical way to determine the focal length? thank you, Bill

March 20, 2004 03:40 PM Forum: Equipment Talk

Aperture & resolution (if all things were equal)

Posted By Bill Barrett
I have been debating with a friend of mine, that if all things were equal (not considering field of view, chromatic aberration, baffling etc.) more aperture=more light gathering ability=better resolution at = magnification. He contends one is not a function of the other. any thoughts?



March 26, 2004 04:18 AM Forum: Equipment Talk

What is needed to view the transit of Venus?

Posted By Bill Barrett
I have never done any solar observing and was wondering what would be needed to safely view the transit of Venus? I'll probably be using a Pronto. thank you, Bill

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