Megapixels are good for most purposes. The problem is this: the megapixels don’t tell you much. What really matters is how many pixels the sensor has.
The sensor is an electronic device in your camera. The resolution, if you like to think of it as pixels per inch, is something like 2.4 x 1.54 (mm) square. A pixel is nothing more than a bunch of pixels all arranged in a certain way. If a camera has a sensor that’s good, and the image isn’t terrible (for example, a Canon EOS 400D’s image looks like a print from a large gallery), the digital signal processing (DSP) chip can do its job – that is, it does the job that the camera needs to do to deliver the images you’re looking at at a reasonable frame rate. The rest of the sensor’s work isn’t very exciting. If you need a big sensor, you’ve got to buy a big sensor, and that’s where the megapixels come in.
Image-processing software can make use of the megapixels and create an optimized output, but even if it could, how many should you buy? The key to choosing is the frame rate, the number of megapixels that you can expect in a given picture. At a given resolution, the most sensitive sensor is the one with the fewest megapixels in it. If a picture is too fast for your camera’s sensor, you need a camera with a higher resolution than that.
It may seem like too much of a choice when you can just choose a lower resolution camera but that’s not true if you’ve got a good camera. There are more practical ways of making an eye-candy display than putting your eyes in front of your camera. If you use your camera for everything, you’re going to have a great camera.
In a nutshell
Here’s the bottom line in a nutshell. The size, resolution and shutter speed of your camera won’t determine whether your image is good or not. It’s the megapixels that will tell.
The megapixel rule also makes my life easier because I know what the rules are. Here are my rules:
Do it. There’s no need to be shy or shy about what you’re doing. You don’t need to be embarrassed or embarrassed about it because you’re doing it. You can do it and feel happy you did.
You’ll have to be
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