Pentax never made a Kmount camera with stop down metering until the istD? hahahahaha
Sounds about right to me because they switched to open apeture metering/AE back in the screwmount era, around 1973. You could modify a K lens, just remove the aperture activation lever (lens always stopped down) and remove the aperture setting cam (camera will think the lens is wide open) metering would be stop down and correct but you end up with a manual aperture lens. JCO -----Original Message----- From: Gonz [mailto:[EMAIL PROTECTED] Sent: Thursday, November 04, 2004 10:45 PM To: [EMAIL PROTECTED] Subject: Re: Stop Down Metering on K, M, LX Not sure what you mean by that. What does faking stop down metering to do a test have to do with handheld metering? Handheld metering is always going to be useful, especially incident metering. We were trying to find a way to fake a K-body into using a K-mount lens like a screwmount would behave on the body, i.e. the aperture set would look like it was wide open so that there would be no inaccuracy in the stop down mechanism. [EMAIL PROTECTED] wrote: > Makes a complete nonsense of using a handheld meter then!!!!!!!!!!!!! > > John > > > ---------- Original Message ----------- > From: Gonz <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Sent: Thu, 04 Nov 2004 16:45:10 -0600 > Subject: Re: Stop Down Metering on K, M, LX > > >>Hmmm. You may be right on that, since normal K mount cameras may >>depend on this, whereas the *istD does not have it. I'll have to >>test this and report my results. >> >>rg >> >>Don Sanderson wrote: >> >>>This will work for the aperture but I believe it will >>>also throw the cameras meter way off. >>>When not fully seated the lever that reports how >>>many stops from full open the lens is set won't be >>>in the correct position. >>>1/8 of a turn could be several stops. >>> >>>Don >>> >>> >>> >>>>-----Original Message----- >>>>From: Gonz [mailto:[EMAIL PROTECTED] >>>>Sent: Thursday, November 04, 2004 3:22 PM >>>>To: [EMAIL PROTECTED] >>>>Subject: Re: Stop Down Metering on K, M, LX >>>> >>>> >>>> >>>> >>>>Shel Belinkoff wrote: >>>> >>>> >>>>>Hi Christian, >>>>> >>>>>A couple of reasons. First, a week or so back JCO made the >>>> >>>>assertion that >>>> >>>> >>>>>by metering thru a lens set at the taking aperture, measuring the >>>>>actual light transited rather than having the camera essentially >>>>>calculate the exposure, would result in a more accurate, or >>>>>precise, >>>> >>>>exposure. I'd like >>>> >>>> >>>>>to see if there's any truth to that, and if there's any practical >>>>>difference. >>>>> >>>> >>>>My guess would be that the difference would be so tiny as to be >>>>insignificant. Esp with film since there is so much latitude. >>>> >>>>But if you are really interested in testing this, an interesting way >>>>to do this would be to use Mark's trick with the *istD, that is, >>>>mount the lens so that it is not fully locked, to a position such >>>>that the lever that keeps the aperture wide open is not engaged. I >>>>believe he said it was about 1/8 of a turn or so, but check with >>>>him. This is ok for tests like you want to do, but I would not >>>>recommend this for everyday shooting, as the lens is in somewhat of >>>>a precarious situation not fully locked in and could fall off. >>>> >>>> >>>> >>>> >>>>>Also, I want to compare two similar lenses, one being a Super >>>> >>>>Tak that can >>>> >>>> >>>>>only be used stopped down on K bodies and the other being a K >>>> >>>>mount version >>>> >>>> >>>>>of the lens. It would seem that if the metering styles used >>>> >>>>were the same >>>> >>>> >>>>>(assuming there IS any difference as suggested by JCO), the >>>>>comparison between the two lenses may be more accurate. >>>>> >>>>>However, I doubt that I'd want to shoot that way when making >>>>>regular photographs. >>>>> >>>>>Oh, there's a third reason: I've just a little too much time >>>> >>>>on my hands >>>> >>>> >>>>>right now <LOL> >>>>> >>>>>Shel >>>>> >>>>> >>>>> >>>>> >>>>> >>>>>>[Original Message] >>>>>>From: Christian <[EMAIL PROTECTED]> >>>>> >>>>> >>>>>>>Is there a way to use a K-mount lens on the K, M, or LX bodies >>>>>>>with >>>>> >>>>>stop >>>>> >>>>> >>>>> >>>>>>>down metering instead of having to use open aperture? >>>>> >>>>> >>>>>>Just a silly question, and forgive my ignorance, but why would you >>>>>>want >>>>> >>>>>to? >>>>> >>>>> >>>>> >>>> >>> > ------- End of Original Message ------- >
