Bob
):-{])) <---- madden@netcom.com madden@svpal.org Remember amateur astronomers: "keep looking for the next Universe"
On Mon, 8 May 1995, Jaakko T Oksa wrote:
>
>
> This no longer has to do with crayford focusers, I just want to explain
> how I obtained a very smooth and accurate focuser with almost no cost.
> I bought a broken f=50mm SLR objective, removed the optics and other
> unneccessary stuff, and fitted a 1.25" aluminum tube inside it. It is
> as good if not better than commercial helical focusers, except that it
> has very little travel (about 10mm). It had to be mounted very accurately
> because of the short focus travel, but on the other hand it didn't cost
> me more than $5.
>
> Jaakko Oksa
>
>