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

Started Jun 8, 2014 | Discussions thread
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MartinsB Forum Member • Posts: 92
Re: What does a Screwdrive Converted Pentax DA* 50-135mm F2.8 lens sound like?

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?

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