SURVEY - Do FT / mFT users know the difference from "full frame"? Replies wanted!!

Started Apr 26, 2013 | Discussions thread
Mr.NoFlash
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Please rethink the effect of IBIS or rename your equivalence to DOF-equivalence
In reply to Great Bustard, Apr 27, 2013

Great Bustard wrote:

.......

As a corollary, "equivalent lenses" are lenses that produce equivalent images on their respective formats, which means they will have the same AOV and the same aperture diameter.  ........

Thus, 25mm f/1.4 on mFT (4/3) and 31mm f/1.8 on 1.6x result in the same AOV and DOF for a given perspective (subject-camera distance).  If we also include the same shutter speed, the same total amount of light will be projected on the sensor for each system.  If the sensors are equally efficient, this will result in the same total noise.  If the mFT (4/3) lens is twice as sharp as the FF lens, and the 1.6x lens is 1.6x as sharp as the FF lens, the sensors have the same pixel count and AA filter, then all will capture the same detail.

Please rethink the effect of IBIS ( in body  image stabilisation ) on the shutter speed if the camera is held by the same hands.  assume a factor of perhaps 2 on average ( if the target does not move, its a factor of ca 3, if the target moves or a tripod is used, perhaps a factor of ca 1 - 1.5, i assume both cases happen roughly equally often ). Please include  in body  image stabilisation  into your theory or rename your theory to Dof-equivalence. Remember that no canon 50mm lens has image stabilisation.

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