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: 12569 Loc: Cumberland, R I , USA42N71.4W PRISMS - BaK 4 vs BK 7 - Roof vs Porro       02/06/04 11:49 AM Edit   Reply   Quote   Quick Reply:   The original discussion that took place concerning the glass type used for prisms is buried within a thread where you would never find it. Here is a link to that discussion. Not all posts in the thread relate, so you may have to skip around a bit. Where to buy now retitled to Bak 7 vs Bak 4 And don't miss this post way at the bottom of the thread Bak 7 vs Bak 4 when to use Another thread with some additional comments Bak6? This more recent thread (9/05) discusses some of the properties of BaK4 and BK7 glass and why they are (or are not) used for prisms in binoculars. Prisms and Coatings - Differences Roof Prisms vs. Porro Prisms What are the advantages or disadvantages of one over the other, or are the differences just perceived differences? Do the different types of prisms have any affect on Depth of Filed or Stereoscopic vision? This thread begins to discuss the issues. Dut also refer to the Best Of thread on Depth of Field and 3D or not,3D! for more related to the same topic. -------------------- Teach a kid something today. The feeling you'll get is one of life's greatest rewards. member#21 Edited by EdZ (10/26/07 08:16 PM) 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 15 registered and 27 anonymous users are browsing this forum. 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