Exclusionary Optics
Q. What happens if a digital-only lens is used on a film camera?
A. It will explode. (Just kidding.) Digital-only is a confusing term that, happily, is falling into disuse. Digital SLRs with smaller- than-full-frame (e.g., APS-C) sensors can use lenses that project a smaller image circle than those designed for use on full-frame cameras. Early on, they were dubbed digital-only to set them apart. Today we call them APS-C lenses after the sensors they’re made for.
An APS-C lens on a full-frame camera, film or digital, tends to produce serious vignetting because its image circle can’t cover the entire frame. Canon prevents this by making its APS-C lensmount (designated EF-S) incompatible with its full-frame DSLRs. With Nikon APS-C lenses (designated DX) on a full- frame Nikon DSLR, you can switch the camera to DX mode to crop out the vignetting. Going the other way, full-frame lenses work fine on both APS-C and full-frame bodies.
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