Modding mounts/adapters for electronic chips?

fishy wishy said:

Does anybody here modify mounts and adapters to fit electronic chips, e.g. to get focus confirmation or stabilisation for certain cameras? Sony Alpha stabilisation will not work without camera recognition of the lens length.

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Availability of cheap chips is very dependent on lens mount. Canon EOS has the most cheaply available, and they're also user reprogrammable. Sony A ones are cheap too, but most are not user reprogrammable. The Sony A chips are most often seen on M42->A adapters.

fishy wishy said:

I have seen someone's record of filing a shape in a lens mount to do this.

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Eeek! Although I suppose that could work....

fishy wishy said:

To be clear, I am not yet intending to do this on an original lens mount, but on an adapter instead like m42 or Adaptall. This way, I get to share the re-programmable chip around the lens collection.

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Sharing a re-programmable chip isn't all that convenient and Sony A chips aren't reprogrammable using the camera.

fishy wishy said:

I am also interested in putting a chip into a Samyang 85mm f1.4 Alpha mount, and wondering if I can get a replacement mount if I bodge it or if I have to cannibalise an old lens for the ring and drill more holes. Any pointers for drilling through aluminium or brass?

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Yeah: don't do it. If I felt compelled to do something like this, I'd remove the portion of the mount, create a 3D model of it, and then 3D print a replacement with space for the chip. I've 3D-printed a lot of camera/lens parts, but this has never been a priority for me. Second choice would be my little CNC mill/engraving machine to mill a pocket for the chip, but I'd definitely favor keeping the original mount intact.

Perhaps 'reprogrammable' lens chip suggests too much. Apparently by a sequence of button half-presses when you turn it on, you can choose between 50/85/135/200mm focal lengths.

Thanks for the ideas.

fishy wishy said:

Perhaps 'reprogrammable' lens chip suggests too much. Apparently by a sequence of button half-presses when you turn it on, you can choose between 50/85/135/200mm focal lengths.

Thanks for the ideas.

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If you are starting with a "dumb" adapter, you might think about dedicating an adapter to each lens, so that the 85mm adapter reports being an 85mm lens, and the 200mm adapter reports being a 200mm lens, etc. It's 4 times as much work, but no fiddling with switches or changeable logic (once set).

This thread should put you on a path to chipping a Samyang/Rokinon 85 1.4.