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There are several good answers here and I just wanted to point out some things. The diameter of the "mouth" of the lens doesn't have to do with image quality. Sometimes is used for marketing, and sometimes are needed for a bigger elements inside. But given two lenses with same optics and different diameters will have the same projected image on the sensor. ...


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Adjustment LAYERS are non-destructive in Photoshop. You can delete or disable them at any time and get back to where you started w/o any losses. Adjustment layers only add data to the file; as shown by the file size (document size can be selected in lower left of the UI). The problem with 8bit vs 16bit is the accuracy of the math (digital edits are all ...


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There can be less color in the result, yes. In a pixel, each color channel can take only one of 256 values (2⁸). Each adjustment transforms these 256 values to some other 256 values. But there is a constraint: for any pair of two values of input, the highest value of the two must remain the highest (otherwise you get an effect called solarization). If you ...


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