I just spoke with someone at CPS USA and he noted that this slow lock in low light is not an issue he is hearing (said I was the first). So, if you are a 1DX or 5D3 CPS member having this issue CALL them. He said he was going to do some anecdotal testing himself and speak to the engineers there to see what they've heard, but I was shocked this wasn't on the radar (vs. the black focus point they are hearing a lot about). Speak up!
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