GKPE 8, Yet more NZ ramblings from some flightless Kiwis.

https://photography-on-the.net …/showthread.php​?t=1315392

Oil splatter??

it could be but it's not moving or changing shape when I use a tooth pick covered in a lint free cloth.

Mark Vuleta wrote in post #16121193
Knowing the shutter count won't prevent one failing. It could go the next shot or after 100000 more shots.

There's a known mean time before failure, it's not random - knowing it will help buyers make an informed purchase decision. But you knew this already

momentz wrote in post #16121230
it's not random

it's only not random for the entire number of production units. It's random for each shutter.

Mark Vuleta wrote in post #16121172
If it doesn't sell, It may end up "Roving TSE" like "Where's Nifty 50"

well if you never know, it might end up travelling the world. But then it's a TSE and someone might take a liking to it.

Mark Vuleta wrote in post #16121193
Knowing the shutter count won't prevent one failing. It could go the next shot or after 100000 more shots.

it's trademe, sometimes it's just easy to please those dreaming.

At least they aren't coming over to kick the tires.

joeseph wrote in post #16121236
it's only not random for the entire number of production units. It's random for each shutter.

Thinking about that hurts my head I wonder what the standard deviation of the curve is

I know what your talking about

..... but any white papers I've seen, numbers quoted for the shutter have referred "shutter endurance" or "shutter durability" or "anticipated shutter durability" . Never a rated MTBF
The failure rate is completely random!

momentz wrote in post #16121177
you must hate society in general

Nope just the morons.

As for tilt shift lenses they are fantastically useful tools

Hey Rob, great meeting you the other day... how did the shoot go?

Sancho wrote in post #16123486
Hey Rob, great meeting you the other day... how did the shoot go?

Yeah was good to meet you too.

No shot yet. Perhaps tomorrow night .. had to hunt down a new battery for my triggers!

Mark Vuleta wrote in post #16121294
I know what your talking about

..... but any white papers I've seen, numbers quoted for the shutter have referred "shutter endurance" or "shutter durability" or "anticipated shutter durability" . Never a rated MTBF
The failure rate is completely random!

No it is not.
Completely random would mean that the chance of it failing on the first shot, would be exactly the same as on the 1,000,000th shot.
It is a mechanical part, therefore over time its components will wear, which in turn will mean that over time the chances of a failure will increase.

What you are saying is equivalent to saying the KM on a car shouldn't affect the buying decision. I.e. after 10,000 km or 300,000 km, the chance of the engine dying on me is the same.

If it wasn't random, then all shutters would fail at around their "anticipated shutter durability" or whatever Canon want to call it.

However, they don't. Some have been know to fail straight out of the box & some have been known to go well in excess of a million. I don't know what the average is but I would be willing to bet that it is well in excess of the figure Canon market.

The chance of it failing on either the first or the millionth shot are the same, it could happen.

The odds of it happening are quite different.

Car mileage is a similar thing. I would rather purchase a car the has high mileage but has been driven carefully by a sole driver and serviced regularly than a low mileage one that has been thrashed.

I still disagree.
Sure some fail at the begining, and a few fail with a HUGE number of actuations, but most will fail after a certan number of actuations and before a certain number.
That is why you get that bell shaped curve in statistics. The middle, or peak of the Bell is then taken as the mean failure time. The better the quality of the shutter, then the higher, or further to the right that peak will be. It doesn't mean that your shutter will fail exactly then, however if you take 1000 cameras, and you have one of them, then there is more chance that it will fail at about that time than any other time.
Same with cars. a few will fail after a few KM, and a few after many many more, but most will last a certain amount of time.

My 40D failed about exactly on the expected actuation rating.

Yet it doesn't matter, nice 2nd hand camera, 25000 actuation's, shutter could go next image or it may go 500000 more. There are no guarantees and people seem to be hung up one it.