There is another old truism, GIGO (Garbage In Garbage Out). If you take a fantastic sensor with exceptional controls and feed it a garbage image, it is going to capture (with utmost accuracy) a garbage image.
Your photo starts with the light the lens passes into the camera. If that light is distorted or degraded the resulting photo will be as well. It is as simple as that.
The ideal lens will allow the optimum amount of light into the camera with the least distortion. Generally that equates to a relatively large expanse of high quality/high cost optical glass in a complex stack of lens elements. Lens design is a science unto itself, and I won’t even attempt to go into it here, other than to say, the lens is the most important part of any camera system, period, end of statement.
Interestingly, that is not the message we see in camera advertisements, or in comments and recommendations from friends. The message is that camera choice is all about the megapixels, which brings to our next section, capture media.


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