The first AE automation systems were all shutter preferred. They mostly seemed to use a trap needle system. When the shutter was depressed the aperture needle was trapped at it's current location which limited the lens stop down lever's travel. Most of these cameras did not allow TTL metering in manual mode. Typical is the Canon AE1 which required that you read the aperture from the scale in the viewfinder and transfer it to the lens, (the same is true of the various Konica AR cameras I've handled, as well). Aperture preferred automation required a reliable electronic shutter, which was one of Pentax's claims to fame, in the ES and ESII. These were introduced several years after the first shutter preferred automation cameras. Later cameras added both (and therefore program modes), as the electronically timed shutters were less expensive and more reliable.
J. C. O'Connell wrote: >Aperture preffered was always more >Popular than shutter preferred, probably >Because it controls DOF better than >Shutter preffered does. Many many SLRs >Had it while few offered shutter priority. >Can you name a single camera that only >Had shutter priority? ( not just an addition >To aperture priority) >jco > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of >William Robb >Sent: Saturday, October 21, 2006 1:14 PM >To: Pentax-Discuss Mail List >Subject: Re: The JCO survey > > >----- Original Message ----- >From: "J. C. O'Connell" >Subject: RE: The JCO survey > > > > >>I am sorry, but this is a really, really, bad argument. On one hand you >>Are saying you enjoy the "much more enjoyable" automation of "A" and >>later lenses and bodies, But then on the other hand youre saying that >>removal of the only Automation the K/M lenses have is "of little >>consequence". I am sorry But that is a really ridiculous argument. You >>cant have it both ways dude. Either the automation options are a good >>thing are they arent, you are arguing against yourself in totally >>opposite directions in the same post! >> >> > >I happen to like Program mode for when I want to do mindless >snapshooting and shutter preferred auto when I want an automatic >exposure mode. >K/M lenses support none of the above automation functions. >Aperture preferred auto is something I never use anymore, and something >I only used out of desperation when it was the only automatic exposure >choice I had. > >William Robb > > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
