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Message: <blockquote data-quote="STM" data-source="post: 409306" data-attributes="member: 12827"><p>What you have listed above are what are referred to as "equivalent exposures". It would be the same as ASA 100 (I still can't get used to saying ISO) and 1/125 second @ f/4 and 1/250 sec @ f/2.8. Both yield the same exposure, all other things being equal. One of the unique, though somewhat cumbersome at times, features of Hasselblad "C" lenses is that you set aperture and shutter speed (the shutter is in the lens not the camera) on rings on the lens barrel opposite each to set exposure. You have to depress a lever to unlock them. Once set, when you rotate one ring the other ring moves with it and each click will be an equivalent exposure. Later lenses like the CF had the two rings which moved independently of each other, but you could depress a button on the aperture ring which would lock them together and again give you equivalent exposures.</p></blockquote><p></p>