Is my thinking about equivalence right?

Started 3 months ago | Questions thread
Iliah Borg Forum Pro • Posts: 28,684
Re: Is my thinking about equivalence right?
9

rogerstpierre wrote:

Iliah Borg wrote:

rogerstpierre wrote:

the number of pixels, or data points you may want to call it, defines the size of the image

As any scanner operator worth his salt will tell you, no. The size of the image depends on the number of pixels and output resolution (which, effectively, is the space between the adjacent pixels at the output, or the ratio between the spacing in input to the spacing in output, and that is the magnification).

Absolutely, and a 20Mpix M43 image will print/display the same size as a 20Mpix FF one for any given print/display resolution, so if you want to talk enlargement of the image in a digital world you can not refer to frame (sensor) size but rather to the resolution of the image.

You don't see that you contradict yourself.

From an enlargement perspective the actual physical size of the sensor is irrelevant

From the "enlargement perspective" it's not, because if you think about it, you are enlarging what is captured, and what is captured depends on the capture system as a whole, which is more than just a sensor.

BTW. Do you think that the taking lens resolution and aberrations don't matter? How do you maintain CoC on the enlarged image? Imagine that pixels are infinitely small, and thus the "resolution" of the sensor is infinite. What's the limiting factor for the resolution of the captured image?

and to say that the image captured by a sensor 1/2 the physical size that of another needs be enlarged twice as much to achieve the same viewing size is simply wrong. If that were true, a 20Mpix image captured by an M43 sensor printed at 150dpi would be the same size as a 20Mpix one captured by a FF sensor printed at 300dpi.

OMG.

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