Question about EF 50mm f/1.4 USM

hello all
is this lens a Full Time Manual Focus
thanks

He's asking if manual focusing is possible when the switch is in autofocus. The answer is yes.

Thanks all

Nightdiver13 wrote in post #14823223
He's asking if manual focusing is possible when the switch is in autofocus. The answer is yes.

yes that what i meant
thanks again

Isn't it still not recommended since it's micro-USM and not real USM? Thought I read something about the gears potentially wearing out...

Cokeman wrote in post #14823301
Isn't it still not recommended since it's micro-USM and not real USM? Thought I read something about the gears potentially wearing out...

Failure of the AF motor is a common problem according to the Lens rental failure data. I wonder if this is a cause of that?

Cokeman wrote in post #14823301
Isn't it still not recommended since it's micro-USM and not real USM? Thought I read something about the gears potentially wearing out...

Yes. It's the only non-ring USM that allows FTM and it never felt quite right when doing manual override on mine. If you plan to do that a lot, I'd get the Sigma 50 instead.

FEChariot wrote in post #14823455
Failure of the AF motor is a common problem according to the Lens rental failure data. I wonder if this is a cause of that?

To be pedantic, the failure is not so much the motor per se; rather, it's the fragile cam and guides that move the lens elements in and out. We hear much about this fragility - which undoubtedly exists - but I've never read even ballpark statistics on the failure rate in percentage terms. Anyone help?

And, yes, FTM is graunchy and mechanically the least satisfying aspect of the lens.

xhack wrote in post #14824479
To be pedantic, the failure is not so much the motor per se; rather, it's the fragile cam and guides that move the lens elements in and out. We hear much about this fragility - which undoubtedly exists - but I've never read even ballpark statistics on the failure rate in percentage terms. Anyone help?

And, yes, FTM is graunchy and mechanically the least satisfying aspect of the lens.

http://www.lensrentals​.com …9/11/lens-repair-data-3-5

They put out a new data page every so often. I know I have seen the 50/1.4 on the list for AF motor failure a few times. Recently it seems to have dropped off the list though.

FEChariot wrote in post #14824503
http://www.lensrentals​.com …9/11/lens-repair-data-3-5

They put out a new data page every so often. I know I have seen the 50/1.4 on the list for AF motor failure a few times. Recently it seems to have dropped off the list though.

Awesome info, and it is right on that list at 19% or number 5.

It is also good to know about the ones they feel have an excellent track record as well, in addition to the ones that they have had to stop carrying all together.

Is the 17-55 really that unreliable?

I suppose that if anyone could give a fair assessment, it would be those guys. There are lots of reports of problems from individuals (myself included), but every lens has its share of bad apples, and there continue to be plenty of happy owners.

16% in the latest one

http://www.lensrentals​.com …/01/lens-repair-data-2011

tagnal wrote in post #14827683
16% in the latest one

http://www.lensrentals​.com …/01/lens-repair-data-2011

This is great data. Thank you both who provided these links.

Also keep in mind that each lens they rent gets shipped two ways for each rental and handled by lots of different people. So they really are a torture test for lenses. I'd guess they uncover many weaknesses in lenses that the average person would not.