I was noting the other day how dust spots have affected my camera equipment over the past few years of photography and would be interested to know if the same issues have been experienced by other users.
I started off in January 2005 with a Canon EOS 300D and quite a few lenses. At that stage I was trying to figure out which lenses would suffice my needs. Obviously I was interchanging lenses on quite a regular basis. What was interesting was that I never had a dust spot problem with the 300D.
In January 2006 I upgraded to the Canon EOS 20D and also reduced my lens number quite drastically. However, I began to pick up dust spot problems within the first six to eight months of use even though I was interchanging lenses less frequently.
In January 2008 I upgraded to the Canon EOS 40D and now only have two lenses in my bag with the Canon 24-105L IS lens almost permanetly attached to the body. Horrors to say is that by February I already have a couple of grotesque dust spots rearing their ugly heads on my pictures. I was quite surprised since the 40D comes with active dust spot removal. I will however be taking the body through to a technical specialst for a "blow out" soon.
An interesting history of dust spots none the less.