I suspect this is just bad, confused writing rather than an attempt to defy the laws of optics. I think a generous interpretation would be that he was trying to say something along the following lines:
1. For a given EV, an aperture setting of f/2 and an ISO of 100 will lead to the same shutter speed regardless of which sensor you use 2. Different sensors have different 'native' sensitivity, but they are calibrated to the ISO standard If I've interpreted this correctly then - 1. is correct but hardly earth-shattering news - 2. I've no idea whether this is correct or not (except for calibration to the ISO standard) or what a signal multiplier is or what it has to do with anything. I think this person is trying to impress with scientific-sounding mumbo-jumbo. Someone who doesn't know anything about photography, or who is confused about the variables involved in photography, is unlikely to be helped by such poor writing. B > On 26 May 2015, at 23:39, Igor PDML-StR <[email protected]> wrote: > > > I am surprised that everybody is mad about the DOF part, but nobody is > surprised by this nonsense: > > "Here is a fun fact: the lens set to f/2 on every sensor will result in the > same shutter speed for the same exposure. This is because the sensors have > different signal multipliers, meaning that 100 ISO is not really 100 - it is > actually multiplied, and you simply don't see that." > > While all the equivalence discussion is such a mess (it can be confusing), > and this guys is totally confused, in this statemenet, he defies the laws of > optics, including the definition of aperture and it's relation to the amount > of light coming through the lens. > > James: the simple response is: do not read what's written on the public > restroom's walls. > > Igor > > > > On 26/05/2015 4:34 AM, james wrote: > > While reading the photography part on flipboard (Smart phone app) A guy > named Dzvonko Petrovski is talking about crop v full frame sensors. > > > Edited quote: > A 50mm F2 lens on full frame is as expected a 50mm F2. On a 1.5 crop > sensor, it is a 75mm F3. > > Link here: > http://www.lightstalking.com/?s=camera+sensor+size > > > Huh???????? A lens gets darker on a crop sensor???? > > > James > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
