Autofocus Problems - DPChallenge Forums

Canon EF 17-40mm f/4.0L USM

09/04/2005 04:43:56 PM · #1

My 'camera''s 'autofocus' doesn't work. I see ghosting when I look through the viewfinder. I took off the lens and was looking at the mirror - i had the 'camera' upside down - put the lens back on and it worked again (no ghosting, 'autofocus' lock) for about 90 seconds. Tried again, but I don't know what I did the first time and couldn't duplicate it.

Obviously one of the mirrors or screens is loose. I know it has nothing to do with the sensor and 'camera' operates fine (manually focused).

Has this ever happened to anyone? More importantly, do you have a ballpark figure on how much canon is gonna charge me to get it fixed?

Thanks in advance for sharing any similar experience.

milo

peecee

Canon EOS-5D

09/04/2005 04:45:22 PM · #2

Have you tried another lense?

Canon EF-S 18-135mm f/3.5-5.6 IS STM

09/04/2005 04:47:47 PM · #3

yes ... it's definitely the 'camera'

Originally posted by peecee:

Have you tried another lense?

SteveJ

Canon EOS-7D

09/04/2005 04:51:20 PM · #4

Originally posted by hopper:

yes ... it's definitely the 'camera'

Originally posted by peecee:
Have you tried another lense?

I bought the 300d in february, it worked fine for a week, then the mirror and mounting dropped down. Took it back and got a replacement. All has been fine since then, touch wood!

Steve

suemack

Canon EOS-20D

Canon EF 24-105mm f/4.0L IS

09/04/2005 04:51:34 PM · #5

Had probs with my 300D a while back too. It was a worn shutter release and they replaced the sub mirror stopper ('not' sure what that is) (my panic thread)

'Not' sure on charges as it was covered by the warranty.

benhur

Canon EOS-40D

Canon EF 24-85mm f/3.5-4.5 USM

09/04/2005 04:59:03 PM · #6

I had this problem last week when setting up for a portrait shoot.
I tried another lense and it was ok, i put the original lense back on and it still wouldn't focus so I turned the 'camera' off and back on again with the lense still on and it worked ok.
'Not' sure what caused it but turning it off and on again seemed to reset it.
Hope this helps.

Canon EF-S 18-135mm f/3.5-5.6 IS STM

09/04/2005 05:03:47 PM · #7

thank you all for the quick replies ...

i'm 100% certain it's 'not' the lens, the problem is the same on all 4 of my lenses (35 f2, 50 1.8, 85 1.8, 28-135IS)

I don't hear anything moving around, but the ghosting i see is a reflection of the image which should be there (if i explained that right) - which makes me believe its a mechanical problem, 'not' an electronic problem - but what do i know :)

SteveJ

Canon EOS-7D

09/04/2005 05:16:03 PM · #8

Originally posted by hopper:

How old is the 'camera'?? If in warranty, take it the dealer you bought it from.

Steve

09/04/2005 05:18:07 PM · #9

OK - further inspection has yielded the following:

The mirror which flips up during exposure is actually 2 mirrors. When the mirror snaps back down, the second mirror (which is attached behind the first) is supposed to "flop open" which you cannot see because the first mirror is in the way.

Anyway, mine doesn't always "flop open", thus creating a problem for the 'autofocus'.

Great ... now how do I fix that?

:)

09/04/2005 05:19:11 PM · #10

I bought it when they were originally released ... no more warranty.

Originally posted by Formerlee:

How old is the 'camera'?? If in warranty, take it the dealer you bought it from.

Steve

Azrifel

Fujifilm X100VI

09/04/2005 06:04:31 PM · #11

Originally posted by hopper:

I bought it when they were originally released ... no more warranty.

Originally posted by Formerlee:
How old is the 'camera'?? If in warranty, take it the dealer you bought it from.

Steve

Isn't there some rule in your country that gives you the right to demand a free fix because a 'camera' is supposed to work well for longer than that whatever the warranty period is. (We have it in Holland, just an idea. It goes like this: Sony gives 48 months warranty on a TV, but it breaks down after 55. No more warranty, but a TV is supposed to last a lot longer so Sony still has to fix it like warranty was still in place.).