Mysterious "orbs" on photos - ghosts or bunkum

Hi everyone,
This is my first post here, so please be gentle with me :)

I am performing some research on the little spheres seen on digital
and 35mm
photographs, touted by many as "evidence" of "ghosts". However, many
reputable
people simply dismiss them as drops of water or dust illuminated by
the camera's flash (a view that I hold). It is many years since I did
optics, and it never was one of my favourite subjects (and it was so
long ago, it didn't cover recent developments in technologys such as
CCDs etc.!)

I was wondering if you would care to look at some of my thoughts - as
well as a dispatch I recently received from Canon on my website:
http://www.btinternet.com/~dr_paul_lee/orbs.htm
- what I would like is for some of the technical jargon to be
explained,
something that is beyond me and which might convince the lay person
once and for all that these orbs are a load of rubbish. If possible, I
would
like to place some further comments on my webpage, with attribution
naturally.

Best wishes to you all

Paul