Happy Halloween

General Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Misc. Topics | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: Scope Problem

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Kip Crawford on January 2, 2000 19:48:18 UTC

The scope you mentioned is a achromat lens type. They are known for low color correction because the lens is a two element optic. For achromatic lenses this is considered normal. As for the multible images, it could be poor eyepiece quality. Usually refractors never need collimation due to the fact that the lenses are fixed to the tube. Do this...set the scope outside and wait for the tube to cool down. Use the lowest power eyepiece you have (25mm) or so and focus on a star. Try this without the 90 degree diagonal and then with it. See if there is a difference. Usually using higher power eyepieces in a small refractor (70mm is small). Let us know what happens.

Follow Ups:

    Login to Post
    Additional Information
    Google
     
    Web www.astronomy.net
    DayNightLine
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2019 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins