A survey to get a feel for the problem and the various solutions.\n\nPlease reply to all questions.\n\nPlease stick to the script.\n\nPlease do not add rambling replies or opinions.\n\nIf surveys like this are not your cup of tea, we understand, and you do\nnot need to post.\n\nYes, the first question is numbered "11."\n============================================================\n\nI\n\n11. How long after you got your DSLR did dust evidence show up?\n[Reply in months preferred.\nIf no dust then state months and NO DUST.]\n\n\n12. Do you do a deliberate test for dust?\n\n\n\n12a If yes, what technique?\n\n\n\n13. How often do you change lenses on your DSLR?\n\n-Never\n\n-Occasionally\n\n-Often\n\n-Often with each time I use the camera\n\n13a. If "Never", then is your lens a zoom?\n\n\n14. Where do you store your camera and lenses?\n\n\n15. Do you clean out your camera bag regularly with attention to dust\nremoval?\n\n\n\nII.\n\n21. How do you clean your dust from the sensor?\n\nTechnique, product, links, etc.\n\n22. Are you satisfied that you can keep the sensor clean with\nreasobable results?\n\n\n23. Do you believe or have evidence that you've scratched the sensor?\n\n\n\n31. BRIEF COMMENTS.\n\n\n\nI'll decide on how I report the results according to the replies. But\nas they'll be 'part of the record', everyone can analyze them as they\nsee fit.\n\nCheers,\nAlan.