Quote:
Originally Posted by Canis Vulpes
I understand this is because of a coating applied to the sensor anti-alias filter. This coating is charged one way or the other to detract dust and reduce its build up.
I must take approx 8,000 pictures per year and I need to clean it only once in that time. 95% od my shots show sky so dust is very noticable when present.
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In this instance the camera was dirty from new (I suspect it was a spot of grease on the filter), but I photoshopped it out initially. However I do change lenses very often (and while I try to be careful, sports is not the easiest subject for me to be taking my time over) and I would say I easily take 30,000 images a year (in just one event I can take 2,000+) so now I'm happy to clean it myself I do see it as a good investment.