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Originally Posted by mithrandir
I know the chip is in the adapter. I can order M42 adapters programmed with almost any focal length and f ratio. Not T-mount. I have asked and they refuse to make them.
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Sorry, I had read your post as though you had found the loose chips, not adaptors, and they were only suitable for M42 lenses.
The chips for Canon EOS's are also available loose so they can be fitted to adaptors or even EF mount lenses that don't have the chip.
Perhaps something similar is available for the Sony.
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Sony's in-body anti-vibration and flash guns use the focal length to optimise the shake and FOV calculations.
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Aha, tricky!