On 10 Apr 2005 at 13:03, Peter Williams wrote: > I think I saw a theory that zooms act like a pump and suck > in air (complete with dust) to the camera body.
Quite a few primes also breathe quite a lot of air when focused, macro lenses without IF for instance. However I don't know if it adds significantly to dust ingress. I've heard all sort of dust avoidance theories, some photographers even advocate facing cameras down when changing lenses so the dust doesn't "fall" in? I prefer to just to clean it out when it becomes problematic. :-) Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
