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] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Binoculars Previous   Index   Next   Flat   EdZ Professor EdZ Reged: 02/15/02 Posts: 12600 Loc: Cumberland, R I , USA42N71.4W Binoviewer - Scope - Binocular Equivalents       01/26/07 01:46 PM Edit   Reply   Quote   Quick Reply:   It is necessary to understand all of this information to get a clear picture of the equivalents from binoculars compared to scopes and finally compared to scopes with binoviewers. This thread gives data collected from three different models binoviewers and shows how clear aperture restricts field of view. A summary is given for lowest power acceptable field of view for binoviewers and then it is also given as a binocular equivalent. The comparison is made to show lowest power widest field of view available in stock bargain binoviewers as compared to binoculars primarily in the range 70mm to 100mm. Binoviewers and Binoculars (equivalents) See also the Best Of thread on Binocular Summation, the benefit of two eyes. Binocular Vision Summation - Two Eyes vs One Eye Binoviewers and Clear Aperture If selecting one of the 20mm CA binoviewers on the market, not only is there a light loss at the outer edges of the field stops, but also the Maximum True Field of View that you can get will be restricted to eyepieces with field stops about 22-23mm max. You can purchase a more expensive binoviewer with a 26mm or more clear aperture to get wider BV field of view. Is there a scope that's best for binoviewing? This post I put in the Binoviewer forum starts out " A few things you should know about binoviewers and scopes". I notice people in discussions about their binoviewer equipment have a few misconceptions. What I try to do in this post is explain not only how clear aperture affects the field of view, but also how the various attachments to the binoviewer nose change from the specified magnification factor when used in different scope/diagonal configurations. It is my experience, some people that are using binoviewers with an SCT scope have not attempted to determine what magnification they are using or what they are getting for true field of view. It is not as simple as assuming all the stated nominal factors and focal lenghts control. This post helps explain some of the above. edz Post Extras       Entire thread Subject Posted by Posted on "BEST OF" the Binocular Forum - Start Here EdZ 01/24/04 07:51 AM GOOD STUFF FOR BEGINNERS EdZ   01/26/07 01:48 PM First Binocular Purchase? Questions? EdZ   01/26/07 01:47 PM Binoviewer - Scope - Binocular Equivalents EdZ   01/26/07 01:46 PM Surface Brightness of Extended Objects EdZ   03/17/06 04:00 PM Polish Binocular Tests and Reviews EdZ   03/07/06 09:52 AM Writing a Binocular Review EdZ   10/29/05 12:29 PM Limiting Magnitude and NELM EdZ   10/29/05 12:28 PM Resolution Testing and USAF Res Charts EdZ   10/29/05 12:27 PM Chromatic Aberration, Triplets, Semi-Apo, Apo EdZ   10/29/05 11:41 AM Dark Adaptation, Eye Pupils, Lights EdZ   08/25/05 10:50 AM BOOKS for Binocular Observers EdZ   06/02/05 07:46 PM Binocular Deep Magnitude Observing Charts EdZ   05/03/05 07:45 PM Binocular Photo Gallery EdZ   03/28/05 11:05 AM Binocular Vision Summation - Two Eyes vs One Eye EdZ   02/10/05 11:53 AM POLLS in Binocular Forum - take a poll EdZ   02/10/05 11:52 AM Testing Binoculars in the Store Before Buying EdZ   01/15/05 09:29 PM In Pursuit of Cheap Binoculars. What to Expect. EdZ   12/30/04 12:07 PM Handheld Binocular Observing EdZ   12/29/04 07:30 AM Fixed Focus Binoculars EdZ   12/16/04 12:08 PM BINOCULAR OBSERVING REPORTS AND TARGET LISTS EdZ   12/10/04 06:42 PM Depth of Field and 3D or not 3D! EdZ   12/10/04 06:36 PM What can be Seen in Various Sizes Binoculars EdZ   09/19/04 06:21 PM Philosophy and Binocular Ownership by Bill Cook EdZ   09/12/04 03:30 PM Affect of Eye Pupil on Binocular Aperture EdZ   07/22/04 11:38 AM Favorite Binoculars in Various Sizes EdZ   07/22/04 11:37 AM Best binocular overall or in a given price range EdZ   07/22/04 11:36 AM MEASURING / TESTING Optical Aspects of Binoculars EdZ   03/21/04 03:30 PM Contrast EdZ   03/20/04 08:48 PM Need Binocular Collimation or Repair? EdZ   03/17/04 12:08 PM Cleaning Lenses - Binoc Repair Eyeguards - Caps EdZ   03/15/04 09:36 AM If They Look the Same, What Could be Different? EdZ   03/15/04 07:06 AM Binocular Articles over on the Reviews side of CN EdZ   03/03/04 10:55 PM ABERRATIONS AND DEFICIENCIES EdZ   03/02/04 06:49 AM How to Focus Binoculars EdZ   02/07/04 10:18 AM Binocular Mounts - Tripods - Adapters - Motions - Homemade EdZ   02/07/04 10:17 AM PRISMS - BaK 4 vs BK 7 - Roof vs Porro EdZ   02/06/04 11:49 AM Edge Performance - Sharpness of Field EdZ   02/06/04 11:48 AM Terrestrial Viewing EdZ   02/05/04 06:23 AM Resolution and Visual Acuity EdZ   02/03/04 09:10 PM Aperture / Magnification relationship - Exit Pupil EdZ   02/03/04 09:04 PM Coatings EdZ   01/25/04 09:31 PM Zoom Binocular Cautions! EdZ   01/25/04 08:58 PM Exit Pupils 5mm vs 7mm EdZ   01/25/04 07:50 AM AFOV vs. TFOV and Separations for Measuring EdZ   01/24/04 01:48 PM Twilight Factor - Visibility - Binoc Index EdZ   01/24/04 01:43 PM Extra information 11 registered and 18 anonymous users are browsing this forum. 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