As opposed to pressing a button and turning a wheel. J. C. O'Connell wrote:
>I guess the terms are unclear, by saying "instant" it seems >To imply compensation for the new aperture setting rather >Than bracketing or metering compensation. Why use "instant" >In that context? >jco > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of >Bob W >Sent: Tuesday, October 17, 2006 3:06 PM >To: 'Pentax-Discuss Mail List' >Subject: RE: K1D aperature simulator survey, part Deaux > >That's why it's exposure compensation, and not a changed exposure. If >you take the original reading at 5.6 then change the aperture to 2.8 >without Gbing again, and without the light changing, you will >overexpose (or compensate) by 2 stops, which is what Peter wrote. > >However, if you take the original reading and the light changes before >you take the picture, the camera can take the changed light into >account and vary the shutter speed or iso when you make the exposure >because it knows the difference between the original wide-open >reading, the immediate pre-exposure reading, and the original >stopped-down reading. > >-- >Cheers, > Bob > > > >>-----Original Message----- >>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>Behalf Of J. C. O'Connell >>Sent: 17 October 2006 19:25 >>To: 'Pentax-Discuss Mail List' >>Subject: RE: K1D aperature simulator survey, part Deaux >> >>Sir, You wrote quote : >> >> >>>>" If you change the aperture you get >>>>instant exposure compensation" >>>> >>>> >>I did read it correctly. >>jco >> >>-----Original Message----- >>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >>Behalf Of >>P. J. Alling >>Sent: Tuesday, October 17, 2006 2:23 PM >>To: Pentax-Discuss Mail List >>Subject: Re: K1D aperature simulator survey, part Deaux >> >>Huh, didn't you actually read what I wrote? You don't change the >>aperture between shots if you want it to work. The camera >>remembers the >>difference between wide open and stopped down from the last time you >> >> > > > >>indexed the exposure. Half pressing shutter wakes up the meter the >>camera takes that reading and applies the offset, as if it had an >>aperture simulator. If you change aperture you have to re-index by >>pressing the green button or use the difference between offset and >>actual set aperture as an exposure adjustment. >> >>J. C. O'Connell wrote: >> >> >> >>>Wont work because there is no way the camera knows >>>You changed the apeture setting unless the aperture >>>Is stopped down all the time and its not ( that would >>>Drain the battery if they tried that as it's a solenoid >>>If I am not mistaken ). >>>jco >>> >>>-----Original Message----- >>>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >>> >>> >>On Behalf Of >> >> >>>P. J. Alling >>>Sent: Tuesday, October 17, 2006 1:13 PM >>>To: Pentax-Discuss Mail List >>>Subject: Re: K1D aperature simulator survey, part Deaux >>> >>>I think you're being too complicated. How about this. Call it >>> >>> >auto > > >>>stop down compensation >>> >>>1.) Mount a K lens. Or take an A/F/FA off A position. The Camera >>>automatically senses this. >>>2.) Set the mode dial to Av, if it's not there already. >>>3.) Press the green button. >>> a) The camera takes a meter reading and temporally records it. >>> b) The lens stops down to taking aperture and makes a reading >>>subtracting the EV value from the temporally stored value. >>> The camera now knows the difference between >>> >>> >>wide open and >> >> >> >>>the current F stop set on the lens. >>> >>>Now every time you take an exposure the camera calculates the >>> >>> >proper > > >>>exposure based on that offset. (It and also display an >>> >>> >>estimate of over >> >> >> >>>or under exposure in the viewfinder). >>> >>>No extra dials or buttons to press. If you change the >>> >>> >>aperture you get >> >> >> >>>instant exposure compensation. >>> >>>If you change aperture and don't want exposure compensation >>> >>> >>press the >> >> >>>green button again. >>> >>>Make this type of operation a menu item in the custom menu with a >>>default to the Av behavior. >>> >>>Basically an aperture simulator for Av all done in software. >>> >>>The only problem is that you might run out metering range, >>> >>> >>but that's >> >> >>>true of using the green button Kludge now anyway. >>> >>>Cory Papenfuss wrote: >>> >>> >>> >>> >>> >>>>>> Of course it's academic since it's not an option with the >>>>>> >>>>>> >>>>>> >>>>>> >>>current >>> >>> >>> >>> >>>>>>firmware, but I don't think it would be too bad. The +-EV only >>>>>> >>>>>> >>works >> >> >>>>>>within 3 EV from wide open, and even then you have to do >>>>>> >>>>>> >>the math of >> >> >>>>>> >>>>>> >>>>>> >>>>>> >>>how >>> >>> >>> >>> >>>>>>many stops you are from wide-open. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>Or 6 if you calibrate on 3 stops up from open-aperture. I >>>>> >>>>> >>have done >> >> >>>>>it, Cory, it's a pain, even without having to go into a menu to >>>>>indicate the aperture. >>>>> >>>>>Kostas >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>> I still think that's more confusing than what I'm thinking. >>>> >>>> >The > > >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>>>most annoying thing is having to set (somewhere) the >>>> >>>> >>maximum aperture >> >> >>>> >>>> >>>> >>>> >>>of >>> >>> >>> >>> >>>>the lens... I'm thinking a "button+wheel" maneuver in P or Av mode >>>> >>>> >>when >> >> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>>>you mount up a K/M lens. Firmware could "blink" the aperture >>>> >>>> >(e.g. > > >>>> >>>> >>>> >>>> >>>'1.4') >>> >>> >>> >>> >>>>to let you know you set it. After the lens is mounted and >>>> >>>> >>max dialed >> >> >>>> >>>> >>>> >>>> >>>in , >>> >>> >>> >>> >>>>you just have to dial the wheel to match what you've set >>>> >>>> >>the lens to. >> >> >>>> >>>> >>>> >>>> >>>It >>> >>> >>> >>> >>>>saves having to mentally do the math, allows open-aperture >>>> >>>> >metering > > >>all >> >> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>>>the way to the min aperture of the lens, and doesn't >>>> >>>> >>require the "GB >> >> >>>>trick" evertime the lighting changes... only that when you move >>>> >>>> >the > > >>>>aperture ring on the lens you match it with the dial. >>>> >>>> How exactly do you get 6 EV? >>>> >>>>-Cory >>>> >>>>-- >>>> >>>>************************************************************ >>>> >>>> >>********** >>* >> >> >>>> >>>> >>>> >>>> >>>** >>> >>> >>> >>> >>>>* Cory Papenfuss, Ph.D., PPSEL-IA >>>> >>>> >>>> >>>> >>>* >>> >>> >>> >>> >>>>* Electrical Engineering >>>> >>>> >>>> >>>> >>>* >>> >>> >>> >>> >>>>* Virginia Polytechnic Institute and State University >>>> >>>> >>>> >>>> >>>* >>> >>> >>> >>> >>>>************************************************************ >>>> >>>> >>********** >>* >> >> >>>> >>>> >>>> >>>> >>>** >>> >>> >>> >>> >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>-- >>Things should be made as simple as possible -- but no simpler. >> >> --Albert Einstein >> >> >> >>-- >>PDML Pentax-Discuss Mail List >>[email protected] >>http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> >>-- >>PDML Pentax-Discuss Mail List >>[email protected] >>http://pdml.net/mailman/listinfo/pdml_pdml.net >> >> >> >> > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
