Bob, as far as I can remember from what I have read about effects on CCD sensors, Magnetic Fields aren't great for sensors or the electronics, and a magnetic field can also introduce 'noise' in images.
If you want to see the effect a magnetic field has on sensors and electronics, move a magnet near the screen of your TV, then move it around. Look at what it does to the TV picture!
Magnets give off an Electromagnetic field. They are great are scrambling data signals.
__________________________________________ Ken James - Snake Valley Australia CAMERAS: Samsung SCB-4000, Mallincam Xtreme & Xterminator, 3 different Revolution Imagers, 2 ToUcams, SX-5c, Canon 350d, 2 different IMX224's (an RI & RT) and an RT178. Broadcaster on NSN as 'Snake Valley Australia' HERE --> www.nightskiesnetwork.com/ - Video Astronomy Website: ballaratman.wix.com/videoastronomy