A lens adopter is a small mount-like structure that is used to attach a lens to the camera. This adapter is to attached non-compatibles lenses onto a camera body. It is basically a bridge that connects mismatched camera brands and lenses together. If we were to use a Canon lens on a Sony camera, then we would need a lens adapter for that to happen. Some passive adapters include manual iris control. Whereas, active lens adapter communicates between the lens and the camera electronically.
Some advanced lens adapters now have new technology such as tele compressor and focal reducer. These types of adapters are in use to increase the overall performance of the lens. If the lens adapter is glassless, then there would be zero or minor quality loss in the image. But if the adapter has its lens in it or different lenses then it may affect the quality of the image.
Despite all these things, it still is a handy tool that could be in use every now and then. It is a good tool in order to use different lenses with an unmatched camera body.
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