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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
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Re: What does a Screwdrive Converted Pentax DA* 50-135mm F2.8 lens sound like?
In reply to awaldram, Jun 10, 2014

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.

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