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What does a Screwdrive Converted Pentax DA* 50-135mm F2.8 lens sound like?

Started Jun 8, 2014 | Discussions thread
awaldram
awaldram Forum Pro • Posts: 13,271
Re: What does a Screwdrive Converted Pentax DA* 50-135mm F2.8 lens sound like?

MartinsB wrote:

awaldram wrote:

MartinsB wrote:

awaldram wrote:

DA* 16-50 7 years old no failure

da* 55 4 years old no failure

da* 300 6 years old no failure

da* 50-135 7 years old failed at 4 years was replaced

That gives an MTBF of 24 years !

How did you calculate that?

7+7+4+6 =24 years with 1 failure 24/1 = 24

These are different products (even if some components are the same) and such calculation appears to be useless.

We are discussing SDM failure not individual lenses , all are SDM so the calculation is valid for my lens.

The statement posed was 'SDM failure is inevitable' my experience proves the statement is false.

no more no less it stands on its own facts something often in short supply.

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