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Don't worry about auto focus not working as removing the filters negates it anyway , changes internal focal length. Not an issue for a telescope mounted camera, and you can always focus a lense manually if you must. Re Error 99, there are certain steps that should be taken to clear it. The partial lockup and then an Error 99 i have seen before, if you have ckeared the fault and it still shows try this: removed the memory card, and the battery. Sometimes you will hear the shutter park itself when you open the card door or remove the battery. This indicates the shutter mechanism is reset to park. You can then reinstall card and battery and try again. Also there is a big cap in there and some models have a memory battery, you can let the camera sit fir awhile without the card and battery and it may drain any extraneous voltage held. There are a number of suggestions online for clearing Error 99.
Good luck.
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