· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User   You are not logged in. [Login] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> ATM, Optics and DIY Forum Previous   Index   Next   Flat   Andy Taylor twistin' by the pool Reged: 09/24/08 Posts: 431 Loc: t=0 UK Compact refractor       07/01/09 03:21 PM Edit   Reply   Quote   Quick Reply:   Hi all... I'm considering building a lightweight compact refractor for travelling. At the moment I'm thinking of using a 100mm F4 objective and then further down near the focuser using a negative achromat to bring it to around F8...basically a full time barlow lens. What is the best placement? Can anyone point out the pitfalls of doing this...? -------------------- -------------------------------------------------- Equipment list of shame: A strange heap of assorted junk that when thrown together and dragged out into the dark shows me the wonders of the universe... And then dews up... Post Extras       Entire thread Subject Posted by Posted on Compact refractor Andy Taylor 07/01/09 03:21 PM Re: Compact refractor tim53   07/02/09 09:28 AM Re: Compact refractor Owen   07/02/09 09:25 AM Re: Compact refractor Andy Taylor   07/02/09 09:47 AM Re: Compact refractor Owen   07/02/09 10:01 AM Re: Compact refractor Gordon Rayner   07/03/09 07:55 PM Re: Compact refractor drexelpbp   07/05/09 11:12 AM Extra information 4 registered and 7 anonymous users are browsing this forum. Moderator:  Don W, Mike I. Jones  Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Rating: Thread views: 354 Jump to *International Year of Astronomy 2009* -----   Global Coordination   Cornerstone Projects   Special Projects   Special Task Groups   Global Activities   National and Regional Activities   IYA 2009 in Africa   IYA 2009 in the USA*Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Beginners Forum   Celestial Events   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Celestron SkyScout and Meade mySky   Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   General Observing   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Other* -----   Science of Astronomy & Space Exploration   AstroWebsites   Space Rocks*Speciality Forums* -----   AstroArt   Astronomy Software & Computers   Stellar Media   Astro Outreach, Clubs and Star Parties*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements CN Forums Home

Cloudy Nights Sponsor: Astronomics