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Forum: Pentax Medium Format
02-11-2017, 11:20 PM
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Yeah, there are no electronics telling the camera body which aperture you chose. But it can measure amount of light, and expose accordingly.
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Forum: Pentax Medium Format
02-11-2017, 02:33 PM
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I don't have a Pentax 67, but on Mamiya's lenses, the Auto/Manual mode is for using auto stop down metering. That means that no matter what fstop you choose, the camera iris will always be wide open until just a moment before the shutter opens, that way you can and see and focus better before taking the picture. And it also tells the built in meter to meter with the Fstop you chose, instead of wide open. If you're using an dalater that doesn't have the Auto lettering, it doesn't supports it, so, the lens needs to be set to manual, and the Fstop you choose will in fact lower the amount of light getting in, from the moment you choose it, so your camera can only be used in Manual or Aperture priority mode.
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