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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Oct 2011 (Sunday) 09:55
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Push-Pull on Canon 100-400mm

 
Bogino
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Oct 16, 2011 09:55 |  #1

I am going to view a used Canon 100-400mm later today and I know the zoom works using a "push-pull" method. I haven't tried one of these out before but just checking on the following: When I try it out should the "push-pull" be a very "smooth" process. Or do some of these develop a rough feel to them. In other words should the sliding back and forth of the lens have a very smooth feel to it. Thx.


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Crafty
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Oct 16, 2011 10:07 |  #2

yes it should feel reasonably smooth.

The critical bit is the locking ring - ensure that is smooth and isn't stiff, it should be easy to move with thumb and finger and smooth in operation. Locking rings are known to fail, they get messed up by people push/pulling whilst locked (or partially so), wrecks them no end, it is a bit of a weak spot too I think. Look for little bits of black tracing paper falling out of it.
Over here its a £130 fix from Canon ($180 ish ?) a repair in the USA might be cheaper.
No problem to get it repaired, just factor in to the price.

Lens should come with both end caps, a hood and a carry bag.


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kram
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Oct 16, 2011 10:20 |  #3

When the lock ring is off, the movement is really smooth. It gets tighter with the lock ring - but never rough....


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JuliusUpNorth
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Oct 16, 2011 17:35 |  #4

What Crafty and kram said. I have had my 100-400 for several years. It is my most often used lens, and the lock ring is still as tight as it was when I bought the lens new (probably because most of the time I have the lens locked at 400 mm).

Good luck--I hope you will enjoy your new lens!

Julius




  
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KCMO ­ Al
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Oct 16, 2011 20:32 |  #5

This is probably the trickiest part of this particular lens...the locking ring. It just takes a little experience to know how YOU like it. I usually loosen it while shooting and then tighten it before I stow it so the lens doesn't zoom out when you shoulder it or release it. Great lens. Perfect for air shows, zoos and the like.


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EOS Lenses: Sigma 24-70 f2.8 EX - Canon EF 17-40 f4.0L - Canon EF 24-105 f4.0L - Canon EF 35 f1.4L USM - Canon EF100-400 f4.5-5.6L IS USM - Canon EF100 f2.8 Macro - Other stuff: MR 14EX - 430EX - 580EXII - ST-E2 - TC1.4x - TC-80N3

  
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Tanglefoot47
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Oct 17, 2011 06:07 |  #6

If it's rough could mean the bearings are messed up or the tightening ring is to tight




  
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pdemetreos
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Oct 18, 2011 05:38 as a reply to  @ Tanglefoot47's post |  #7

I've rebuilt a couple of these. If you see any scars on the barrel, the tighting mech has gone out...this requires a fair amount of service to correct. With the locking ring all the way open, the lens should be very easy to open and collapse. Smooth and noise free throughout. If it binds or gets harder to move through any part of its travel, then its proabably worn and again needs service. Doesnt mean you shouldnt buy it...just make sure everything works and get it for a good price. The locking ring is part of the outer barrel assembly and costs around 130.00 USD plus labor....




  
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marcosphoto
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Oct 18, 2011 07:40 |  #8

I just bought one, and let me tell you they're everything BUT smooth. The IS is loud, the barrel is not sealed at all and the zoom is not the smoothest no matter where you put the locking ring. They are a little tricky to operate but man are they ever sharp for the price and focal lengths! The IS may be loud and first generation technology but very effective none the less. I suggest leaving the lock looser as opposed to tighter to avoid the potential for locking ring damage, build up stronger arm strength to carry and operate the thing and enjoy. I know there's a lot of good shots coming with mine.




  
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Crafty
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Oct 18, 2011 14:20 |  #9

IS isn't that loud on mine I don't think ?
As said both zoom and locking ring should be smooth.

As someone else said above unlock the ring completely when in use, then lock up before it goes back in the bag.

How did it go Bogino ? did you buy it ?


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Bogino
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Oct 18, 2011 14:27 |  #10

Crafty wrote in post #13268662 (external link)
IS isn't that loud on mine I don't think ?
As said both zoom and locking ring should be smooth.

As someone else said above unlock the ring completely when in use, then lock up before it goes back in the bag.

How did it go Bogino ? did you buy it ?

I tried it out and did exactly as suggested which was to make sure the locking mechanism was fully unlocked and the push/pull was perfectly smooth. I did not buy on spot cause I had to take a look at one other lens but that one did not pass the mustard so I am picking up the original one in question tomorrow. Looking forward to it. Leaving for Costa Rica in about 5 weeks so I know it will come in very handy. Appreciate all the comment and feedback. Was very helpful.


Canon 7D Mark II; Canon 70-300mm "L"; Canon 100mm Macro; Tamron 24-70mm; Tokina 11-16mm 2.8

  
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FlyingPhotog
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Oct 18, 2011 14:30 |  #11

One thing to be aware of:

A good locking ring should turn about an inch to an inch and a half from full loose to full tight. If it only moves a very tiny amount before it grabs, it may be on the verge of clutch failure which means the sleeve inside which applies friction is going bad or the cams that drive it are going bad.

Look for scratches along the barrel to see if the previous owner liked to zoom with too much tension applied. The zoom action itself should be very free and smooth. This lens will "fall" to 400mm if tilted down without locking.


Jay
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Push-Pull on Canon 100-400mm
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