nanakristine wrote:
Wondering which makes the photo a ggod quality photo a good censor or the amount of pixels? Sorry
Neither. The true, if flip answer is: the PHOTOGRAPHER.
Pixel dimensions (megapixel count) just affects detail and recorded resolution. Sensor site size affects dynamic range and noise. A 16MP full frame sensor and a 16MP Micro 4/3 sensor have roughly the same number of pixels, but their images are subtly different.
Sensors have millions of tiny receptors, or sites, each of which is covered with a red, green, or blue primary color filter. The larger the sensor's site size, the more dynamic range and less noise you get. HOWEVER, this tendency is also affected by the quality of the processing that turns these RGB coded signals into a raw data file, and subsequently, into an image file. The sensor sites on a 16MP full frame sensor are FOUR TIMES larger than those on a 16MP Micro 4/3 sensor, and TWICE as large as those on a 16MP APS-C sensor.
As a general, rough rule of thumb, a 24x36mm full frame sensor will have one stop more dynamic range and one stop less noise than an APS-C sensor of the same quality grade and megapixel count. A Micro 4/3 sensor has 1/4 the area of a full frame sensor, so all other things being equal, it will have two stops more noise and two stops less dynamic range than a full frame sensor. The APS-C sensor is right in the middle of this range, with about 2/3 to one stop advantage over Micro 4/3.
Of course, if you made a 64MP full frame sensor, it would have very similar noise and dynamic range characteristics to a 16MP Micro 4/3 sensor, because the sensor sites would be the same size. But you would have to enlarge the full frame image by 2X (4X the area) to see that.
The most relevant question you must ask yourself, therefore, is, "DOES ANY OF THAT MATTER?" The answer depends on the kind of subjects you wish to photograph, the size prints you make (or whether you print AT ALL), how much you expect to crop, how often you need to work in very bright or very dim light, and several other situational factors.
If you record landscapes and make huge prints (larger than 24x36 inches), a full frame camera with a high megapixel count can be important for retention of detail and color depth. If you never print, but only post images on the web, just about any camera will do.
Sensor size in MP and MM is JUST ONE factor in the equation. There are DOZENS of important factors that affect camera platform and brand choice. The mix you choose may be perfectly appropriate for what you do, but not for what I do, and vice-versa. There is no one absolute best camera, platform, brand, etc. — just what meets your needs, circumstances, hopes, dreams, desires, aspirations...
censor = person who redacts (removes) potentially objectionable material from publications, movies, or broadcasts
sensor = something that translates reality into signals that can be transmitted or recorded for viewing elsewhere or later