Re: Note 7 or stick with Note 4?
The front camera is an upgrade from 3.7MP to 5MP on the Note 7, but the rear camera (the most important I think) is a downgrade from 16MP on the Note 4, to 12MP on the Note 7. That's a 25% reduction for a "better" phone?
No, thanks.
Plus the Note 4 is more flexible as it can charge from 0% to 100% in less than 10 seconds by changing the battery, and can be rooted if desired.
As others above me have said, there's way more to what makes a great camera than just the megapixel count.
Phone sensors are typically very small. Usually about 1/3" diagonal at the smallest end to about 1/2.3" diagonal at the largest in most applications. As with all camera sensors, there is a "sweet spot" that allows the camera to capture high amounts of detail while ensuring that the pixels receive enough light for better low-light performance.
Contrary to what you stated, megapixels are not what defines camera performance. In fact, camera performance is determined through multiple factors, which include;
- Aperture size (concerns DoF and exposure)
- Lens quality (concerns color-fringing and chromatic abberations)
- Pixel size (concerns mainly low-light performance)
- Autofocus accuracy and speed
- Software processing
- Stabilization (OIS, DIS or hybrid)
- Sensor quality and size
- Dynamic range
There's way more to what makes a great camera than just megapixel count. In the case of the Note 4 vs the Note7, dropping from 16MP to 12MP isn't actually a bad move. This is done to increase pixel size. On the Note 4's IMX240, the pixel size is 1.12-microns. However, on the Note7's IMX260, the pixel size is increased to 1.4-microns. Obviously, daylight photos may appear a tiny bit soft, but overall, performance is great and still results in lots of detail.
However, the benefit is in low-light. Having a small pixel that is less able to receive light means that the ISO has to be ramped up aggressively while the shutter speed may also be slowed down for increased exposure. OIS can help with the latter for stability, but the former presents issues, especially when it comes to noise-reduction, which can actually smear some detail. In low-light scenarios, it's typically better to have a slightly lower MP count with larger pixels to reduce noise levels, so that noise-reduction doesn't have to be as aggressive in smearing detail to reduce noise.
Overall, the Note7's camera is actually an upgrade. Sure, you lose a few megapixels, but you gain a lot more. You gain much better low-light performance while largely retaining daylight performance, and you also gain an excellent Dual-Pixel autofocus system that's currently the fastest of any phone out there. There's more in store in that camera package, however.
Note that I'm in no way saying that the camera on the Note 4 is terrible. It's still a nice camera to use, even in this day. But Samsung wouldn't simply downgrade a camera. If they had to drop MP count, it would have to be for a good reason, and in this case, I'd say job well done.