A common internet wisdom about photography is that bigger camera sensors capture more light. So if you want to work in low light, you need a full frame camera, and a bigger sensor always produces better image quality. I have struggled with this a lot. It just doesn't make sense: Lenses can focus light on any surface, so why should the surface size matter? The answer turns out to be… disappointing. Big-sensor cameras allow for larger (practical) apertures, and lower base ISO. But less noise ...
