X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Apr 2006 13:52:33 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m28.mx.aol.com ([64.12.137.9] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1085204 for lml@lancaironline.net; Sat, 29 Apr 2006 00:07:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.9; envelope-from=MikeEasley@aol.com Received: from MikeEasley@aol.com by imo-m28.mx.aol.com (mail_out_v38_r7.5.) id q.2c9.72cb865 (1320) for ; Sat, 29 Apr 2006 00:06:49 -0400 (EDT) From: MikeEasley@aol.com X-Original-Message-ID: <2c9.72cb865.31844058@aol.com> X-Original-Date: Sat, 29 Apr 2006 00:06:48 EDT Subject: Re: [LML] Unusual airframe mod X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1146283608" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1146283608 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit I can't speak for any particular camera, but any camera that lists a maximum flash shutter speed has a curtain type shutter. One curtain opens, then the other curtain closes. At shutter speeds faster than the maximum flash shutter speed, the second curtain starts to close before the first curtain has fully opened. In other words, the entire frame is never exposed to the image forming light simultaneously. The same "painting of the image" that happens at high shutter speeds with a curtain type shutter would cause some of the image distortion effects you are seeing. Some of the shutters move vertically, some horizontally. They are also called focal plane shutters. Mike Easley -------------------------------1146283608 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

I can't speak for any particular camera, but any camera that lists a=20 maximum flash shutter speed has a curtain type shutter. One curtain op= ens,=20 then the other curtain closes. At shutter speeds faster than the maxim= um=20 flash shutter speed, the second curtain starts to close before the first cur= tain=20 has fully opened. In other words, the entire frame is never exposed to= the=20 image forming light simultaneously. The same "painting of the image" t= hat=20 happens at high shutter speeds with a curtain type shutter would cause some=20= of=20 the image distortion effects you are seeing. Some of the shutters move= =20 vertically, some horizontally. They are also called focal plane=20 shutters.

Mike Easley

-------------------------------1146283608--