I recently started taking CCD pictures with modified web cam and picked up some particle spots in the frames (same spots on all pictures) I presume that its dust on the mirror of the scope. How do I fix this?
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Re: loose dirt on mirror Meade Lx6
Nope, the dust is on the webcam sensor. The telescope mirror is too far away to influence the image. Most modified cameras have no window to keep dust off the sensor's cover. A camera lens cleaning brush works fine. Also, some cameras have 'hot pixels' that are defects in the sensor, and are permanent.
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Hi, yes of course the mirror can be cleaned, but you need to be extra, extra, extra careful not to scratch because this will determine the clarity of the images you observe. Start by removing the mirror. Use latex gloves and handle only the edges. Next, place the mirror into a warm slightly soapy bath to loosen the dirt. Rinse off the grim using a clean water bath, do not rub with your hands! If there are still particles visible after the rinse, then repeat the steps again, this time let soak for longer.
Lastly, once you are satisfied with your results, wipe the face of the mirror with acetone and replace.
Hope this helps.
The motors have encoder wheels, that pulse when the motor turns, to tell the computer that everything is OK, and to indicate its position. If the wheel is loose on the shaft, then errors are indicated. A second point of error, is dirt in the wheel slots that disturb the sensing, or the optical pickup is bad.