Does print size depend on sensor size, or just pixel count?

[olyflyer]

Two differently-sized 50 MP sensors are capable of producing equal-sized prints.

The camera with the larger sensor will have larger pixels, theoretically (and practically) providing higher quality images in terms of noise, dynamic range and other attributes of the digital information.

A lower number of megapixels (increased “computationally” to 50 MP) would produce lower image quality.

It's not clear to me that a smartphone image would have the same quality as a DSLR/Mirrorless digital camera with the same number of real pixels.

However, the quality of current smartphone images is very good. I wonder that it's still possible to buy point and shoot cameras.

I have a Samsung S23 Ultra which has an extremely capable camera and takes super nice images at 50 Mp. I also have a Nikon Z7 which is also excellent and it takes images at 47 Mp, so they are almost the same. Nevertheless, the Z7 beats the S23 hands down when it comes to image quality, printed or viewed on screen, it doesn't matter. So no, smartphones do NOT have the same quality, not only because of the smaller sensor size, but also because of the lesser quality and smaller lenses. so yes, while technically my phone is just as capable to take equally sized images that can be printed in A3+, the same image taken with the Z7 looks infinitely better at that size.

In fact, P&S cameras will also win against smartphones, even they have higher quality lenses and larger sensors, so I'd be surprised to see otherwise.

 

[olyflyer]

A smaller sensor has smaller pixels, which means a lower signal to noise ratio. So a 50mp photo taken with an APS-C camera at ISO 100 would look the same as a photo taken with 50mp FF camera at ISO 200

...assuming the cameras are of the same age and brand. So in theory, it is as you say, but in reality, that isn't always the case. ...and I don't mean the pixel size but the ISO.

 

[Macro guy]

A smaller sensor has smaller pixels, which means a lower signal to noise ratio. So a 50mp photo taken with an APS-C camera at ISO 100 would look the same as a photo taken with 50mp FF camera at ISO 200

...assuming the cameras are of the same age and brand. So in theory, it is as you say, but in reality, that isn't always the case. ...and I don't mean the pixel size but the ISO.

You have to compare apples to apples. Otherwise, you're going to be running in circles, chasing your own tail

 

[olyflyer]

A smaller sensor has smaller pixels, which means a lower signal to noise ratio. So a 50mp photo taken with an APS-C camera at ISO 100 would look the same as a photo taken with 50mp FF camera at ISO 200

...assuming the cameras are of the same age and brand. So in theory, it is as you say, but in reality, that isn't always the case. ...and I don't mean the pixel size but the ISO.

You have to compare apples to apples. Otherwise, you're going to be running in circles, chasing your own tail

I know how to compare cameras, but thanks for your "wise" words and advise. I had both APS-C (and even smaller) cameras, as well as FF cameras, so I have more than enough images to compare with.