The zoom of my EF-S17-85 IS USM lens is stuck in the 17 mm position. I can't turn the lens to change the focal length. It feels like if a lock as in my tele-lens is on, BUT this lens does not have a lock. Any advice is appreciated.
Hello Pittsburgh! I lived there for 3 years! Dreadful city. :-)
Now, your lens must have a problem with the guide rails/pins. If you dropped it or bumped it, you might have broken/damaged those guide rails. Another reason might be sand/grit in the zoom mechanism.
You may try stripping the lens slowly and see if you can identify the problem. Most lenses are easy to disassemble, you start from the rear mount area, take off screws, and parts one by one, and be organized (i.e., take photos for every step and don't mix the screws).
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There are moving contacts inside the lens which communicate focal length data back to the body via a voltage level, and they have either become worn or dirty.
Either way, when you set the lens to 35mm or less the voltage which passes the information drops out and the camera signals the error 99 to inform you that the lens has stopped talking to the camera.
This is not a user fixable item. The lens must either be repaired or replaced and the problem will get worse if left unrepaired. Contact an official Canon Service centre in your country, you'll find that there is usually a fixed cost repair menu, and often if the fault is a known issue the repair might be free even if the lens warranty has expired.
99' indicates some problem with the AF contacts. This is a common error
in Canon lenses. It could indicate a very simple problem like dirty
contacts or a much serious one like the breakage of USM cable. As a
first step, you can try cleaning the lens and body contacts (the metal
contacts between the lens and body) using a pencil eraser. Be careful to
hold the body facing down so that no dust falls inside. After cleaning
both the lens and the body contacts, re-attach the lens and try
shooting. If the AF does not work still, you need to take the lens to an
authorized service center. For the jerky focusing ring, you need to get the lens serviced by an authorized service center.
You haven't stated which body you have but the AF will not work with the extender if the effective lens aperture is too low (remember that a 2x extender doubles the focal length but halves the effective aperture).
Canon's own website states: "Autofocusing does not operate if the effective maximum aperture is
greater than f/5.6 (greater than f/8 on the EOS 1V and EOS 3)."
I had the same problem, but it was a case of getting a loose screw tightened up inside the lens.
I took it to an authorised dealer and it cost me the equivalent of about US$25 to get repaired, with the obvious advantage of not messing with the warrenty.
I also hadn't bumped my lens, and I only bought it in July, 2009.. so effectively, new. I did notice the zoom getting looser with time, and would fall out of the chosen zoom length when pointing down (and indeed, up).
Hi i am sagha from mumbai,Being a technician i can suggest you that this problem is not solvable by yourself. It has got a broken film PCB inside your lens.It is getting partially connected when on 24 mm so hurry get it repaired from recognised repairer or else will show error on all focal lengths.All the best
The USM focus works by applying pressure to a set of rollers. That pressure is achieved with a large diameter spring washer. It is held in place by another large diameter flat washer that on assembly is rotated 60 degrees to lock it in place. If the lock washer has moved due to mechanical movement (ie rapid manual movement of the focus ring) it could unlock and then all pressure to the USM motor parts and rollers is lost giving the loose feel you mentioned.
You will need to dissassemble the rear of the lens to see the USM motor parts, rollers and locking ring to reattach it. Follow the links at my pbase gallery to see the dissasembly. When I took my lens apart the focus and USM motor went all loose and I wondered how could it work ever!!!. The locking ring was off which sounds just like your fault. http://www.pbase.com/barry_2718/efs1785mm I also have a flex cable cracked which is a much harder fix. Take careful note of the parts (mark then with a felt marking carefully) to achieve a reassembly exactly as removed.