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Bathtubrule


Kasimir

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Ewald,

 

The Bathtub Curve is a statistical tool that represents the risk of any new product failing during its lifetime. It is based on the the analysis of MTBF (Mean Time Between Failures) which measures how often any new product fails but doesn't look at the cause of the failure or its severity.

 

It's called the Bathtub Curve because, when Failure Rate of a new product line is plotted against Time, the curve resembles a bathtub as shown by the blue curve (Observed Failure Rate) below.

 

But the curve you're interested in is the red Early "Infant Mortality" Failure curve, which as you can see starts lower than the OFR curve and simply shows that the risk of any new product failing is likely to be higher at the beginning of its life than the end of its life because production defects affect the failure rate as do design laws.

 

Statistically the M8 is unlikely to show any better or any worse early failure rate than a mobile phone, an MP3 player, a car, a coffee machine or a toaster. Some will fail but the majority will not. This is only a representation of risk and is the reason behind manufacturers offering warranties.

 

For what its worth, I bought my M8 in the full knowledge of the Bathtub Curve and it hasn't failed to the point where it needed a trip to Solms; yes, there have been some interesting episodes as others here have described but it is still the favourite (of a large number of cameras) that I have ever owned.

 

My advice to you is to forget the Bathtub Curve because any M8 is no more or less likely to fail than any other and no more or less likely to fail than a new car or a new set of golf clubs. Buy your M8 and start enjoying it like most of the rest of us are! :)

 

Pete.

 

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Zitat von jaapv viewpost.gif

The good ones far outnumber the bad ones/

I'm not prepared to argue numbers, as they are unknown.

Anyone else see a contradiction there?

Not at all! When you can't prove anything it's always good tactics to make a point - and maintain the opposite at the same time. That way, you will never lose an argument. :rolleyes:

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Most of these replies have it right. I have had my M8 since last May, It had a dirty sensor when new, B & H photo immediately exchanged it for a new one, which had the same problem, and Leica service in NJ cleanerd it while I had coffee. The only problem since was with flash sync (gnc mode) due to a firmware upgrade which the next firmware upgrade fixed thouroughly.

 

All in , I enjoy the camera and use it for the unique view that it gives.

 

It has never been out of service.

 

I completely agree that a supportive dealer is a must. If you do not have one locally, my experience with B & H photo has been exemplary for 30 years.

 

I also shoot with Nikon's (d300,200) so am not invested in being a Leica apologist, but have used Leica M2, M6, M8 and value them for what they are.

 

Regards ...Harold

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Count me in as “no faults found” since last November purchase. My first lens did give me issues although I now believe it was me or it was just slightly out of alignment. My new silver 50-lux appears to be flawless. At some point I will bag everything and have it tuned by DAG just for the hell of it. In fact, I’m in for the updates only because I’m anal about such things.:D

Regards,

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