interchangeable lens

Definition: Lens mount design in which the attachment to a camera is the same as that of other lenses, so one lens can be used instead of another on the same or compatible camera body. * In the early days of photography, mounts were protected by patents but the majority have lapsed, allowing lens manufacturers greater freedom.
Sermon on the mounts
All manufacturers shall have their own mount design (although such diversity maketh Us despair). As a punishment for your sins, all good mounts shall be expensive mounts. The narrow mount is cheap but maketh life hard for lens designers, therefore be not tempted. Changing a mount design brings down the wrath of the market: therefore avoid doing so unless you have a jolly good reason. The future-proof mount shall inherit the market.

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