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Canon's error 99 is a catch all for several things the short answer is an electronic connection. Something isn't making contact and the first place to go is to the "gold" contacts between the lens and the camera body. Make sure the camera is off and remove the lens, place the camera lens side down on a clean dust/lint free surface or put a body cap on. Take the lens and holding as vertical as possible with the gold contact points down use a soft rubber red pencil eraser to lightly clean the contacts. You can remove any rubber dust and partials with a lens cleaning cloth NOT TISSUE. Make sure the area is clean of lint and dust, place the rear lens cap on or stand the lens up on a clean dust and lint free surface. the camera is a bit more tricky as you need to clean the contacts inside the mirror box. Hold the camera as best you can face down and again use the pencil eraser to lightly clean the contacts. Holding the camera as mus as possible lens side down. This will minimize any dust, dirt or lint getting into the camera body and eventually ending up on the sensor. Remove any rubber dust with a lens cloth not tissue and don't use any liquid, don't use a puffer either all that will do is drive dust partials into the camera. Once that's done install the lens, next remove the battery and do the same cleaning trick with the battery contacts, if you have a battery grip do the same thing. Okay now check out the camera if everything is go and works then you are good to go. If not then I would suggest doing a camera firmware update, all updates can be found on the Canon web site they are free and will correct any issues your camera has with the internal programming which may also be the cause of your error 99.
First question: where is the dust?
If the dust ist outside the cam: no problem. Try a soft brush and remove bigger particles, then take a thin microfibre cloth and clean the dust film on the lens. Be careful - every sand particle scratches the coating, so use the brush!
If the dust is internal it's more complicated.
May be the dust is on the focussing screen. If you dismout the lens, there is a litte lock on the top inside the cam. Do not open without having special tool. Each fingerprint on this little plastic plane is not removable. It's an extreme sensitive fresnell lens.
Don't try to clean that with cloth or brush. Only airflow is allowed.
If this dosn't help - use the Canon service or replace the focussing screen with a new one (as Example Canon EF-D).
Most likely it is dirt/dust on inside the lens. If it is in the bottom of the picture, the dirt will be on the top edge of the lens. If it is inside the lens, you will probably not be able to clean it your selves.
I think the problem is with the technician. I suggest you talk to the manager and ask for another technician to help you with this problem. I do not recommend trying to clean the sensor yourself as you may cause more harm than good.
If the dust is inside the lens, then you are unlucky. Canon lenses (except for a select number of the L series lenses) are not dust or weather sealed. So each time you work the zoom mechanism on a inexpensive EF 75-300mm f/4-5.6 III lens, the mechanism is working like a giant billows allowing air (and dust and moisture) to flow through the lens and camera body. Sometimes large dust particles can accumulate on the different lens elements, but it does not have any impact on the quality of the photo
If the dust is creating problem fro your picture get it fixed from service center i will suggest you should not try to open it
The lens has several stacks of glass, you would have to do a complete teardown to reach all of the surfaces (front and back) of each set of optics. Small amounts of dust will have no effect on image quality. Shy of having a clean room to work in, it is unlikely that you would get all of the dust out.
Same here. dust usually doesnt show up on photos as it is out of the focal plane. Many SLR lenses have dust in them and do NOT affect picture quality. I am in the process of attempting to take one apart. I have seen a damaged one that was seperated at the first 2 joints but it was glued back. this is one tough nut! http://picasaweb.google.com/pishta68/8080lens/photo#5199141246863292738
I had hoped that a few people would check their cameras and posted replies before I contacted Pentax about my dust problem, but nobody has so far. But it's interesting that someone else posted a message this morning that he has some dust inside the lens of his 550.
Anyway, this morning Pentax Canada told me that there should definitely be NO dust inside the viewfinder or the rest of the camera for that matter. Although the Viewfinder is "almost sealed" from the rest of the camera, it is not a total seal - which means to me that if dust can get into the viewfinder, it can get into the rest of the camera's interior - including the lens and imaging chip. They have asked me to bring my camera in so they can remove any dust particles that are inside.
Basically, they told me that the only place I should see any dust is inside the lens cover, which is meant only as a protective covering rather than a seal from dust. Even then, they claim that any dust on the outer lens would only enter while the camera is being used. That one I don't buy, as the lens cover is very flimsy and can easily be accidentally spread open while the camera is turned off.