Originally posted by Class A The shutter speed difference is equivalent to -0.64 stops.
BTW, the comparison to the full-frame sensor is not fair, AFAIC, as f/8 on FF is ~f/5.3 on APS-C.
physics isn't fair.
this is for dof equivalence, not particularly meaningful in this situation.
Originally posted by Class A That gives the full-frame sensor a bit more than a stop of an advantage (which it pays with shallower DOF).
one stop of advantage in what?
Originally posted by Class A So bear in mind that we are not only comparing different sensor technologies, but also different lens speeds.
you seem to think that taking a full-frame lens like the 70mm sigma off of an aps-c and putting it on a full-frame magically causes more light to go through it. this is not the case, it is true that more of the light is used in the case of the full-frame, this is what you might call an advantage of full-frame.
if we continue with the sigma 70mm and take pictures with full-frame, aps-c, m4/3
the metering(iso, aperture, shutter) of a scene whether it is aps-c, full-frame, m4/3 is going to be the same assuming the actual ISO of the cameras is the same and assuming the metering of the cameras agrees.
what will change with the increasing/decreasing light used by the sensor is the field of view.
Originally posted by Class A Well, the gratitude is all mine, because usually this type of exchange of posts ends with my discussion partners going back to square one.
because what you are saying is at best: ambiguous, at worst: nonsensical.
Originally posted by Class A I got a bit tired of talking about the subject because in the vast majority of cases the discussion partners remain unconvinced.
promising news.
Originally posted by Cynog Ap Brychan Thank you for that, and please excuse me if I seemed a little dense. I completely agree that the larger sensor should have a better signal to noise ratio if it has correspondingly larger photosites, all other things being equal (which they never are).
Originally posted by Class A you either
a) didn't read this
b) didn't understand this
so i'll try to help. this article says that if you keep the sensor size the
same and
increase the resolution while
lowering the size of the photosites, you can still find an advantage in SNR, despite the smaller photosites.
it does not say that photosite size is meaningless.
the post by Cynog that you were responding to was keeping everything the same (megapixel, sensor technology) the full-frame will have better snr due to larger photosites. (it was a true statement)
the d600(24MP) has better snr than the k3(24MP) because although they have the same megapixels, the d600 has larger photosites. (assuming similar technology)
the d800(36MP) has better (normalized) snr than the k5(16MP) because although they have the same pixel size, the D800 has higher resolution.