ATM Forum Message | |
| Forums: |
Atm ·
Astrophotography ·
Blackholes ·
Blackholes2 ·
CCD ·
Celestron ·
Domes ·
Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem |
|
|
|
|
||||
|
|
||||||
Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place... The Space and Astronomy Agora |
| 100% Illuminated Image Size
Forum List | Follow Ups | Post Message | Back to Thread Topics Posted by Yusuke Katayama/">Yusuke Katayama on June 12, 1998 12:14:54 UTC |
It looks that there are many opinion about minimum acceptable size of 100% Illuminated Image. Many books says 100% Illuminated Image Size should be larger than 12mm or so (or 20mm for larger telescopes) if we don't want vignetting (light loss). But some other book says that even under 12mm of 100% Illuminated Image Size, nothing happens in the human eyes except the background sky gets blacker and the objects we look at (especially low contrast objects like galaxies and dim nebulae) become much clearer and easier to observe provided 100% Illuminated Image is at least 2.5mm. Does anyone know what will happen in actual when I choose 100% Illuminated Image Size between 2.5mm and 12mm (say 3mm) to reduce a diagonal size? |
|
| Additional Information |
|---|
 |
| About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy |
|
Unless otherwise specified, web site content Copyright 1994-2024 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 |