I don't know about that, because I just repaired my digital camera by taking it apart and straighting the plastic lense on the inside. Now not every digital camera is the same, but if you like to tinker with things like me then unscrew the small screws and explore the inside until you find the problem. It's no that hard if you have a gerneral understanding of machanics Hey if me a 15 year old can do then so can you, besides it makes more scence than buying another one if the other one works just fine.
The internal shutter on the lens assy. is stuck.Turn on the camera look into the front of the lens and zoom,it will be possible for you to see if the shutter is open or close.
If it is close you may have to replace the lens assy.
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Cleaning the lens from the inside is not possible from a practical point of view. However, if you don't care that your camera won't work after you've taken it apart but you just want to see what's inside, then go ahead. If you see dust inside the lens and this is what is concerning you, please know that all lenses have dust inside...it can't be totally eliminated. In 99.999% of cases, the dust doesn't show up on the actual pictures.
First try pressing the DISP or DISPLAY button on the back of your camera. If that doesn't help, try taking a picture with the screen black. Is the picture also black? If so, a stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, sometimes with lines, especially when taken outdoors (for shutter stuck open). To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.
You must lock the aperture ring to f/22, so the camera can engage the aperture adjustment lever on the lens. Then, you can change the aperture with the command wheel.
When you change the aperture with the command wheel the aperture ring on
the lens doesn't move when the camera actually adjusts the lens
Take the lens off and locate the aperture adjustment lever on the lens mount.
Unfortunately, this won't work with older AF lenses. So if you are using an older lens, the only thing you can do is change the camera setting to M (Manual) to adjust the aperture on the lens yourself.
Zborn, did you find any solutions? I have had same lense for 2-3 years, taken maybe 10000 shots and just yesterday started to get error 99. Spent most of today trouble-shooting to repeat problem and it seems that when I set to less than 35mm I get the error 99. other settings and my other lense has no problems.
As simple as this may sound, have you cleaned the lens lately? A lot of image quality deterioration comes from a finger print or other smudge on the lens. Digital cameras are succeptable to even the smallest gunk on the lens. Because the lens element is very tiny, use a cotton swab with a drop of lens cleaner (or isopropyl alcohol) to thouroughly clean and dry the lens. If it isn't a dirty lens, check your file-size and flash settings.