Canon 24-70 f/2.8 users - wobble?

[ben_quinn1]

The part of the lens which extends when zooming in on my 24-70 has a slight

wobble when I apply pressure to it, is this normal to have some play in this part of

the lens. I cannot remember whether it was there before and I am worried there is

something going wrong with it. I don't see any change in the picture quality

however I have been skeptical in the past about the quality of this copy (the first

copy I had went back to B&H as it was quite soft). I always use the hood with

this lens.

 

I can't get hold of another copy to compare so would appreciate some feedback

from other owners.

[bryantan]

Mine has very slight play, but it's a fraction of a millimeter at most, and I'd have to try to notice it.

[KenPapai]

Slight play in mine as well, from the very beginning (3.5 years ago).

[mvw photo]

Very slight play here too.

 

Main question: are the pictures OK?

 

Michael

[digitmstr]

>>has a slight wobble when I apply pressure to it,<<

 

Why would you do that? Lenses, especially zooms, are not rigid monolithic pieces so, some play it's normal.

 

If the play is such that causes the imaage to go in/out of focuse that would be a problem.

[ben_quinn1]

Giampi - why are you asking me why I would want to do that and yeah you are correct,

a lens that goes randomly in and out of focus would be errrr a problem.

[digitmstr]

>>a lens that goes randomly in and out of focus would be errrr a problem.<<

 

I meant, if the wobble is causing the lens to go out of focus as you zoom then, it's definitely a problem.

 

>> why are you asking me why I would want to do that<<

 

What made you want to apply pressure to the barrel? That's what I wondered...

[chrisjb]

Mine just a little, if it did not have some play it might bind and cause for complaint. I have a 28 135 that moves 1/2 a mil extended and a mil when not, its creepy when tilted. 24 70 doesn`t seem creepy :)

[marknagel]

Ben, I'm with Giampi, why? Why do people look for problems in their equipment?

 

m

[photo_dark]

Mine doesn't wobble, but the zoom ring is pretty loose between 65 and 70mm

[fotograf]

I'm not sure why Canon changed direction with the design of this lens and the previous 28-70 f/2.8L as the original lens- the 28-80 f/2.8-4L which came out in the late Eighties did not move when zooming- the lens was normal when zooming, without extending any part of the lens. Same thing holds true for the four 70-200mm lenses. Seems a better design.

[ben_quinn1]

Mark & Gimpi - In anything mechanical some becoming loose can signal the beginning

of the end, think of a wheel that is slightly loose on a car, after a while of driving it

around it would fall off.

 

Its not creepy when tilted but I think the play is too much so I am going to send it back

to canon.

[mark_audacity_romberg]

<b>Brian:</b> I believe the design changed to allow the GLORIOUS self-adjusting

nature of the shade cast on the front element. <br>

Since the lens retracts for 70mm and

extends for 24mm, the front element has less shade at 24mm where it would vignette,

while being fully shaded at 70mm. It's a brilliantly simple design that it would be nice

to see in other lenses.