Attention Canon 100-400L users - DPChallenge Forums

Nikon AF-S NIKKOR 24-70mm f/2.8G ED

04/23/2011 11:18:43 PM · #1

When you look down the barrel of your lens with it pointed straight at the ceiling, can you see one of the elements move with gravity if you tilt the lens back and forth?

Does your lens look like this? (note the asymmetrical iris)

kenskid

Nikon D700

04/23/2011 11:22:05 PM · #2

Don't have the lens but it doesn't look normal.

Originally posted by DrAchoo:

scooter97

Canon EOS-6D

Canon EF 100-400mm f/4.5-5.6L IS

04/23/2011 11:35:48 PM · #3

I've had mine in for repairs (Canon) 2 times in the last 13 months. Both times the issues were with the push/pull mechanism. One time I couldn't manual focus, the other time the lens barrel wouldn't retract after extension ( an element was floating around inside). No charge for the parts (lucky me). Just $332 each time for 'labor'. Does your lens operate normally?

Canon EF 100-400mm f/4.5-5.6L IS

04/23/2011 11:40:54 PM · #4

It does not seem to, but it is sporadic.

It seems abnormal to me to see something move like that, but I thought perhaps there was a free floating element tied in with the IS. That's why I thought I'd ask.

scooter97

Canon EOS-6D

04/23/2011 11:45:10 PM · #5

From what I was told by the Canon Rep., nothing should 'float'. The one element had come loose from it's mounting and that caused the last issue that I had. Call them and ask to speak to a technician.

Bear_Music

Samsung Galaxy S24 Ultra

Sony 24-70mm F4 Vario-Tessar T* FE OSS

04/24/2011 01:16:12 AM · #6

That's not normal :-( Mine doesn't do that...

R.

Cory

Canon EOS-1D Mark IV

Canon EF 85mm f/1.2L II USM

04/24/2011 08:47:49 AM · #7

Hmmm. Moving bits you say? No, that's not normal. What the heck did you do to that poor lens Sneezy?

bfox2

Canon EOS-5D Mark II

04/24/2011 10:35:04 PM · #8

No moving bits in mine, sorry :(

FocusPoint

XIAOMI Redmi Note 8 Pro

04/24/2011 11:15:21 PM · #9

Originally posted by DrAchoo:

When you look down the barrel of your lens with it pointed straight at the ceiling, can you see one of the elements move with gravity if you tilt the lens back and forth?...

Besides the moving parts, how's the results? out of focus? problem with AF?

04/25/2011 11:41:50 AM · #10

I have a sporadic problem with the AF. I'm going to take it in to a local shop today and see what they say. My suspicion is the outermost element (besides the actual outer glass) is loose.

arbitrage

06/05/2011 03:15:50 PM · #11

I have this exact same issue with my 100-400L and found this forum/thread through a google search while trying to find out if its normal or not. I first noticed it when the camera started acting up. I would try to engage metering and focus and the aperture display on the top LCD (camera is a 7D) would flash between 00 and 5.6 in a constant rhythm in sync with a mechanical clicking sound from the lens and the clicking sound is this same glass element jerking back and forth. It only does this sporadically and sometimes the clicking stops within a few seconds and other times continues long enough for me to look down the lens like in your picture and see the element moving back and forth with the clicking sound. It happens with IS on and off but seems more frequently with IS off. I wondered if this was an IS element that is not getting locked back into place when IS stops, therefore when IS is on it rectifies itself as this element is designed to move but with IS off the camera is not trying to move this element and it goes haywire.

I don't know if this element moved before the other symptoms developed but once my attention was brought to this element I now see the same thing you describe that just tilting the lens in any direction moves this element due to gravity. Seems wrong to me and I would like to hear any other opinions on this.

Also, have you had the 00, 5.6 flashing value for the aperture and clicking as I described?