I've spent some time on this issue. firstly I was using the 1Ds Mk II seing the worst dust balls ever - tumble weeds. They cleaned out easily. Got the 5D and saw little specks from time to time - while travelling the San Blas Archipelago in Panamá - extraordinarily easy to get dust on your sensor in that sandy salty environment. Got a bit of dust - not much - but the visible dust bruhs fixed it.
Then I went to Chile near the Cape of Horn on a job. Got a few specks and tried the sensor 8mm brush from the same company. Got the worst oily smears all over the sensor - which I noticed the night after that perfect shoot out on the frigid slippery glacier during an autumn storm!!! The sensor had sucked stuff from a brand new brush. It might have been the Danish customs fiddling with that strange expensive airmail brush, it might have been the oily residue "left on some cameras baffles" getting in touch with the 150$ brush (all things are relly relative I guess, thats just plain stupid VD)
I'm constantly planning new travels, editing iteneraries, attracting customers, catching up on the soft ware releases etc. I don't need to spend my time on stupid non announced sensor vs. baffle issues absolutely noninteresting for photography.
Would anybody respecting their customers behave like Canon Nikon etc. have the liberty of ding now?
Conclusion?
I'm not sure my 5D behaves worse than the 1Ds Mk II, im just positively sure that this issue is a waste of time. Grow up Canon, fix it. Lets get back to our jobs (not electrical engineering)
Sincerely
Sune Wendelboe, photographer
www.globalphotographic.nethmmmmpr