· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums 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] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> ATM, Optics and DIY Forum Previous   Index   Next   Threaded   Pages: 1 CosmoJoe member Reged: 10/03/12 Loc: Gilbert, Arizona Idea for a solar aperture stop       #5552474 - 12/03/12 05:35 PM Attachment (29 downloads) Edit   Reply   Quote Quick Reply   I have a couple ideas for an aperture stop solar filter that might have all the benefits of a small aperture and a full aperture. It basically would use four small aperture stops inbetween each spider. Take a look at my drawing and let me know what you think. Post Extras:       CosmoJoe member Reged: 10/03/12 Loc: Gilbert, Arizona Re: Idea for a solar aperture stop [Re: CosmoJoe]       #5552519 - 12/03/12 06:08 PM Attachment (17 downloads) Edit   Reply   Quote Quick Reply   This is my other idea but the spider would be in the way. and of course the astrosolar film will be in the fstop holes Post Extras:       StarStuff1 Carpal Tunnel Reged: 04/01/07 Loc: South of the Mason-Dixon Line Re: Idea for a solar aperture stop [Re: CosmoJoe]       #5552603 - 12/03/12 06:58 PM Attachment (11 downloads) Edit   Reply   Quote Quick Reply   Your first photo looks eerily similar to a multiple aperture mask I made nearly 10 years ago. But I only used mine on a bright Moon and planets. It dims the image a little on my 8-in f/6 but takes away some irradiance so the image is "steadier", especially with turbulent air. So you cannot not see more details than without a mask but the steadier image is more pleasant. Of course, several notables here will tell you that the diffraction effects will do harm more than help but I do not find that to be the case. I'm no optician but aren't there some large professional scopes (Keck ?) that use segmented mirrors? Seems like diffration effects there would be horrendous. Anyway, it is a quick, cheap and easy project and I don't see why it shouldn't work on solar. If the seeing is really bad you can cover up one or more aperture openings until it gets just right. You might want to consider a light color so the mask isn't superheated by the Sun. Go for it and report back! Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 20 registered and 28 anonymous users are browsing this forum. Moderator:  ausastronomer, richard7  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 255 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    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   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*Speciality Forums* -----   Arizona Science and Astronomy Expo   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*Swap and Shop* -----   Shop and Swap Audio Components*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   IYA Archive Info CN Forums Home

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