Film photographers have known for years the importance of correct exposure. If you overexpose a slide, the highlights are gone irretrievably. If you underexpose a slide, the image will be murky, with no true black tone in the darkest areas. Negative films have a little more leeway, in that you can make some adjustments when printing the negative, but again, the image quality won’t be great if the image is over- or underexposed.
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