IDguy wrote:
Yes, despite carfully changing lenses away from wind and dust, keeping camera body faced down, and using a rocket blower as recommended.
You only see the spots with high fstops. Alas, I do landscapes so usually use high fstops (16 and 22).
Don’t tell Nikon, but I also used my Arctic Butterfly. It worked best. But still have some spots.
Wow. I would expect some dust as a normal thing, but enough to cause a problem, no. Are you using a zoom (aka bellows)?
If you're having that much of a problem I doubt a close shutter would solve the problem. When you change a lens dust will settle inside the cavity and tend to move around whenever the shutter actuates.
(yeah, I know ID. Rhetorical question)