CaptivatedByBeauty wrote in post #11934706
I have referred to recent/current models, those of similar technologies, because otherwise the whole discussion is pointless.
Not at all. The differences due to sensor size can be discussed without any reference to the separate issue of sensor density.
So, in practice, crop sensors have similar numbers of sensor sites, and thus are more dense sensors. Yes it doesn't have to be that way, but that's the way it is right now.
So, in practice, it's not comparing window sizes, it's comparing the images captured by the sensor, both of which will have similar numbers of pixels, but the crop sensor will have captured more detail in the optical path. And that has pros and cons.
Even if two things change simultaneously, there is no basis for attributing an effect to one of them, when in fact it is due to the other. There may or may not be a 'magnification' effect due to sensor density, that is debatable. There is no 'magnification' effect due to sensor size.
A slight tangent.
I keep reading posts referring to "magnification" when referring to the sensor versus the final print. I cringe every time I read them. I can see the point behind them, I can see the way the poster is thinking, it dates back from film and enlargers. But, IMO it's not really quite right. I prefer to consider the image as captured by the sensor, looking at the optics and how the optical path is captured by the sensor with its sensor site array, how the density of that affects the process. IMO the size of the sensor compared to the size of the print is a strange way of viewing it. I don't see that process as "magnifying" or "enlargement".
I see it as the sensor detecting photons in the optical path, and an image file being created. That file is then displayed. There's no optics involved, it's digital now.
I also see the only fair way to compare cameras is to view the same size prints at the same distance. It is after all the end result that matters.
Such an approach makes it very difficult to explain the effects sensor size has on DoF, among other things. Sensors DO have a physical size. It is for that very reason that the "crop factor" exists. Prints have a physical size. The ratio between these sizes is the magnification or enlargement factor, a direct analogy with the relationship between a negative and a print made from it, or of a slide and the projected image.