ATM building a finder

["bill kocken" <wmkocken@hotmail.com>]

Last summer there was a thread about building a finder scope with
inexpensive parts.  Well, I put one together using the objective mentioned
below and a 25mm eyepiece.  The image in it is terrible.  Even in the
daytime, the outer 1/2 to 1/3 is blurry.  At night stars are a total mess.
Does anyone have suggestions?
Is it necessary to stop down the objective?  How much would you suggest?
Might it help if I flip the lens to put the other face outward?
Other ideas appreciated!
Bill Kocken


From: "Bob Walker" <tac@i1.net>
> >Reply-To: "Bob Walker" <tac@i1.net>
> >To: "ATM Group" <ATM@shore.net>
> >Subject: ATM Inexpensive Finders
> >Date: Fri, 25 Jul 2003 22:41:17 -0500
> >
> >
> >I built a finder with a 52mm f/3.5 achromat from Surplus Shed, probably a
> >binocular objective ($7.00), a bit of PVC water pipe and a cheap 25mm
> >eyepiece.  Works great. Cost little.
> >
> >  *  Best regards, Bob
> >*
> >          *           *   *
> >
> >             *         *