 Uriah H. Carr |
CMOS less than half the area of 35mm film plane? Dimensions of my CMOS sensor = 22.2mm x 14.8 mm = 328.56 square mm vs. 36mm x 24mm of 35mm film plane = 864 square mm. 328.56mm/864mm x 100 = 38.02% My calculation says the area of my CMOS sensor is only 38% of the area of my 35mm film plane. Is this correct? If this is true, then we see that a 35mm film exposure records far more data (62% more) than an 8 megapixel exposure records.
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Jon Close |
You calculation of the surface areas is correct. I don't think it necessarily corresponds to the amount of "data" recorded, though. The detail captured by the 8mp 350D or 30D is much closer to 35mm film than the 38% of surface area would indicate.
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Pete H |
Uriah, Your calculations are correct if you were working on the inverse square law, but has little to to with detail capture or resolution. There is much more to a sensor's "area" than physical size. Pete
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Uriah H. Carr |
Thanks to Jon C. and Pete H. I believe you both when you say the relationship between CMOS surface area and resolution is not as simple as what I'd been assuming. Extending on this info, I'm thinking the relationship between the fineness of a film's grain, the density of a sensor's pixels and the comparative surface area of the 35mm film plane vis-a-vis the surface area of a sensor is also not simple. Is it not true you can enlarge a 35mm neg to a greater image size with greater sharpness than you can an 8mp file?
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