Yes! Absolutely correct. However, for a hemisphere you get 90 degrees coverage at the corners. It is already a bit of a wide angle; if I remember correctly, one usually defines a normal lens as one with focal length equal to the length of the diagonal. Here we have the "focal length" at 1/2 of the diagonal.
Incidentally, I am not sure what focusing means with respect to a pinhole. Bob At 21:31 03.10.01 +0000, you wrote: >If you were to use a wide-angle (i.e., short focus) lens, wouldn't you >have to use much less than 1/2 a sphere in order to have the lens close >enough to the film to focus? RKS > > >>From: [EMAIL PROTECTED] >>Reply-To: [EMAIL PROTECTED] >>To: [EMAIL PROTECTED], [EMAIL PROTECTED] >>Subject: Re: [Cameramakers] re: crackpot medievalists or creative endeavors? >>Date: Wed, 3 Oct 2001 07:48:43 EDT >> >> >>In a message dated 10/3/01 6:07:34 AM, [EMAIL PROTECTED] writes: >> >><< You might also consider a >>hemisphere; >> >> >>Bob -- This intrigues me. How would you do it? I am thinking of 8 X 10 with >>a wide angle lens. >> >>Marty >>_______________________________________________ >>Cameramakers mailing list >>[EMAIL PROTECTED] >>http://rmp.opusis.com/mailman/listinfo/cameramakers > > >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > >_______________________________________________ >Cameramakers mailing list >[EMAIL PROTECTED] >http://rmp.opusis.com/mailman/listinfo/cameramakers _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
