StillFingerz Offline Upload & Sell: Off
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BC means 'battery check' and usually involves worn or dirty contacts, it could be the battery, internal clock battery, the grip external or internal contacts...even a battery that has a short or is nearing death...or an internal wire/lead break.
As for tubes, adapters and 3rd party lenses, knowing what configurations you are using might help. Other then 3rd party older Canon mount glass, I only have Canon glass and lens accessories and they all work.
Sometimes there are incompatibility with AF confirm chips of adapters and 3rd party lenses and I've no ideas how you might fix them.
As for the small lever inside the body/mount, I remember reading an article long ago about it's usage, I'll pick my pea brain and try to remember where I read the info.
Good luck,
Jerry
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