SDM failure or not?

Started Mar 11, 2012 | Discussions thread
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Re: SDM failure or not?
In reply to Russell Evans, Mar 11, 2012

Russell Evans wrote:

It's not directly coupled, as if it were, you would be turning the AF screw with the SDM, and we know that doesn't happen. .

I'm sorry to say, but you are wrong in here. When SDM motor turns screw turns also. I have disassembled the darn thing and that is how it is made. There are two gearwheels that couple the motor and screw.

When you turn focusing ring it does not turn the screw, but that is an other thing.

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