From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1SVzv4-00025v-EM for garchives@archives.gentoo.org; Sun, 20 May 2012 06:47:11 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id E3CA7E0777; Sun, 20 May 2012 06:46:56 +0000 (UTC) Received: from mail-1.ca.inter.net (mail-1.ca.inter.net [208.85.220.69]) by pigeon.gentoo.org (Postfix) with ESMTP id 55BC1E075F for ; Sun, 20 May 2012 06:45:32 +0000 (UTC) Received: from localhost (offload-3.ca.inter.net [208.85.220.70]) by mail-1.ca.inter.net (Postfix) with ESMTP id 1DFE02EA856 for ; Sun, 20 May 2012 02:45:32 -0400 (EDT) Received: from mail-1.ca.inter.net ([208.85.220.69]) by localhost (offload-3.ca.inter.net [208.85.220.70]) (amavisd-new, port 10024) with ESMTP id 6zsjyt+olJhy for ; Sun, 20 May 2012 02:45:31 -0400 (EDT) Received: from ca.inter.net (unknown [216.99.59.92]) by mail-1.ca.inter.net (Postfix) with SMTP id AEF592EA850 for ; Sun, 20 May 2012 02:45:30 -0400 (EDT) Received: by ca.inter.net (sSMTP sendmail emulation); Sun, 20 May 2012 02:45:30 -0400 Date: Sun, 20 May 2012 02:45:30 -0400 From: Philip Webb To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] merging or fitting images together Message-ID: <20120520064530.GB3019@ca.inter.net> Mail-Followup-To: gentoo-user@lists.gentoo.org References: <4FADBC1B.3080004@gmail.com> <20120512132257.GA2968@ca.inter.net> <20120515025033.GB2969@ca.inter.net> <20120517043419.GC2965@ca.inter.net> <20120519043828.GB2989@ca.inter.net> <4613CE50-114F-4B8D-BBC1-188F6D30BC21@stellar.eclipse.co.uk> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <4613CE50-114F-4B8D-BBC1-188F6D30BC21@stellar.eclipse.co.uk> User-Agent: Mutt/1.5.21 (2010-09-15) Content-Transfer-Encoding: quoted-printable X-Archives-Salt: c93c8b9b-960f-4122-96e2-ddb9734a75cd X-Archives-Hash: 65f7b0a71869ab0f64f56db3f3fbcf9b 120520 Stroller wrote: > Zoom lenses were much less common even 2 or 3 decades ago. > For a long time, a 50mm prime was the common kit lens, > rather than the 18-105mm zoom which is sold today. > This was because on a camera using 35mm film, a 50mm focal length > gives a field of view very close to that seen naturally by the human ey= e.=20 > Wikipedia states that "the first modern film zoom lens was designed c 1= 950 > by Roger Cuvillier" and Canon's official website (the "Canon Camera Mus= eum") > states that "The history of Canon's zoom lens goes back to 1954." > Since the photos are stated go have been taken in 1953 > it seems highly unlikely that the photographer was using > a highly expensive and cutting-edge zoom lens. I doubt many people > would have been able to afford these zoom lenses when first released.=20 > It seems to me safer to assume that the lens is a 50mm. In fact, looking more closely at the picture of a ZI which I've put up in my I/net 'test' dir (found on the I/net earlier), it says 'F =3D 7,5 cm', so the lens appears to have been a 75 mm . > I guess focal length may change fractionally during focussing > -- as lenses are moved back and forth during as the focus ring is turne= d -- > however it may also be that a camera manufacturer designs a lens > with a 48mm focal length because that's easier to construct for some re= ason > or produces better images and decides to sell it as 50mm > because a 2mm difference makes no difference to the photographer.=20 > Or it may be that the distortion is caused by lens distortion > perhaps Hugin is trying to compensate for that, and straightening up li= nes.=20 > In any case, I might try re-doing the stitch a few times, > each time telling Hugin the lens is 47mm, 48mm, 49mm, =E2=80=A6 51mm, =E2= =80=A6 53mm. > Perhaps you may find that one of those is perfectly spot on. Thanks for the further lesson ! -- it sb tried at 75 mm . --=20 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D,= ,=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D SUPPORT ___________//___, Philip Webb ELECTRIC /] [] [] [] [] []| Cities Centre, University of Toronto TRANSIT `-O----------O---' purslowatchassdotutorontodotca