Mm Compatibility

Most digital sensors are smaller than 35mm, which is why lenses designed for digital can be smaller than those designed for 35mm. Although pre-digital lenses can be used on digital SLRs they may not perform as well, due to their optical characteristics. Lenses designed solely for digital sensors, however, can't be used on 35mm cameras (or digital SLRs with 35mm-sized sensors) because the image they produce isn't big enough in diameter to cover the sensor/film, causing severe vignetting.

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