Photography has advanced considerably from its conception into the digital age. Along with such advancements come additional complications - different sensor types, a variety of sensor sizes, formats and files! So what does it all mean, and why does it even matter?
A bit of background
Early optical or photographic devices (such as the camera obscura) were little more than a simple opening - sometimes with an equally simple lens - that would allow light to pass through, the goal being to generate an image circle broad enough to cover the area required.
Notice 'image circle' - given the physical properties of light, when it passes through an aperture (i.e. opening) it will reform the image as a circular image element; we simply crop this down to a rectangular image for convenience, partly because the image circle will not be sharp or bright to the very edges, nor are circular formats consistantly useful:
Mike Lowe
more : thinkcamera
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