Re: Question re Forum Photo Challenge Rules
Before EOS cameras, the linkage between the lens and the camera in interchangeable-lens cameras was mechanical, a system which dated back many years. When the first EOS camera was appeared in 1987 it introduced the EF lens mount. This uses electrical contacts in the camera body and at the rear of the lens to transmit data. The contacts also transmit power - there is no battery in the lens to operate the focusing or aperture, it all comes from the camera battery.
It is this electrical connection between the camera and lens which gives us the 'electro-optical' part of the EOS name. However, EOS is also a brand name. PowerShots are not EOS cameras.
Originally posted by lunarbo
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Before EOS cameras, the linkage between the lens and the camera in interchangeable-lens cameras was mechanical, a system which dated back many years. When the first EOS camera was appeared in 1987 it introduced the EF lens mount. This uses electrical contacts in the camera body and at the rear of the lens to transmit data. The contacts also transmit power - there is no battery in the lens to operate the focusing or aperture, it all comes from the camera battery.
It is this electrical connection between the camera and lens which gives us the 'electro-optical' part of the EOS name. However, EOS is also a brand name. PowerShots are not EOS cameras.
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