But when they test lenses they only test one sample, not a random selected batch. When we send samples of goods to be quality tested by the SA Bureau of Standards they test at least 6 samples per product code before giving it a go ahead to be imported or for public use.
Statements are always made "oh this camera is made of plastic ergo it wont last very long, that one is made of some alloy so it will last forever"," this ones a nikon so its much better than a Pentax" Surely these people are basing their opinion on some test, whose doing the testing then? Feroze ----- Original Message ----- From: "Bruce Rubenstein" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, June 22, 2003 3:05 AM Subject: Re: Lens Mount Progress > You can't test one camera to determine the designed MTBF of the shutter. > For a manufacturer, a shutter designed for 100,000 cycles means that > very few would fail before 100,000 cycles. It would all depend on how > similar one shutter would be in terms of manufacturing/process tolerance > and what percentage of failures before 100,000 cycles was deemed > acceptable. Figure that mode of the failure distribution curve was > closer to 125,000 cycles. > > BR > > [EMAIL PROTECTED] wrote: > > > How difficult > >would it be to test the mean time of a shutter, it either survives 100 000 > >cycles or it dosn't. > > > > >
