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Re: aperture not going below 6
There is no problem. The lens is f/3.5-6.3. That means that at 200mm the maximum aperture is f/6.3. At long focal lengths you will not be able to open up beyond f/6 or so. At the short end, at 18mm the maximum aperture is f/3.5.
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Hi Norhid. There may be no problem at all. If your camera body is in shutter priority and your lense's aperture ring is turned to any setting besides its widest, the body and lense will not synch. See if you can find an orange aperture setting on your lense's ring, and a white dot on the lense alongside the aperture ring. Mount your 18-135 and line up the orange aperture number with the white dot and see if everything works. If that doesn't help, try switching the exposure modes you're shooting in. Hope this helps.
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)."
1) Zoom - this is by push pull - so you push the lens out to wide angle
2) To switch to manual focus - will need to be done on the camera and then you can use the front control ring to focus - 4) also you can use the button to switch to macro mode - BUT only with the Zoom at 35mm - lens fully extended
3) You have an aperture range of 2.8 - 22 this varies the amount of light allowed into the lens - 2.8 is the most light - F4 to F5.6 to F8 - each change halfs the light allowed in - so changing from F4 to F5.6 half the light
The FEE message indicates that the lens is not set to smallest aperture (highest number). The camera body expects this so it will have full control of the aperture. It sounds like you may be accidentally bumping or turning the aperture ring on the lens while using it or changing lenses. There is a little slide lock to lock it at f/22 to prevent this. Turn the aperture ring to 22 and move the slider so the white dot is next to the orange mark on the lens barrel.
The EOS 40D only use auto focus up to aperture 5.6. Only the 1-series use auto focus up to aperture 8.
The adapter adds 1 stop to the lens aperture. Since the 100-400 is a 4.5-5.6, the aperture range with the extender mounted will be 6.3-8.
There is a work around though. Just place a thin strip of insulating tape over the three pins on the lefthand side (lens side of the extender). No damage will occur to the camera or teleconverter.
FEE means that your lens is not set to the smallest aperture setting. If you are using your camera's auto-focus mode, the lens must be set to the smallest aperture setting which, on your lens, is probably f22 (the smallest aperture is the largest number). Once you set the lens aperture, you should slide the aperture lock to the locked position. The aperture lock is located just right of your largest setting f3.5. This slider should line up with the orange line. To verify that the latch is engaged, try to change the aperture by rotating the aperture ring. In the locked position, the ring will not turn.
something sounds strange about this. aperture 00 is an invalid aperture value. stands to reason if that is the case the camera would complain about it. via error code. being that its only six mos. old i would give canon a ring.
As you have found out, it is not a lubrication issue. It would seem that your lens has a problem with the linkage arm inside the mount. The arm that extends out of the mount could be bent or misaligned. It would be fixable, but the parts are somewhat delicate. Best to let a good repair person have a look.