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17 mm shows 19mm in EXIF on 17-40mm f4

Started Mar 17, 2019 | Discussions thread
Ray UK Contributing Member • Posts: 977
Re: 17 mm shows 19mm in EXIF on 17-40mm f4
1

Inside a modern lens there is a flexible PCB glued around the inside body, this rotates as the lens is zoomed. On the outer moulding there is a contact strip with tiny fingers that ride against the PCB, as the lens is zoomed different contacts will be made and the inbuilt processor of the lens will read this information and transfer it to the lens contacts so that the camera can use it for the EXIF data.

Usually if it is reading incorrectly it means that the contact strip is misaligned and the contact fingers are not touching the right place on the PCB.

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