I know too in household vacuum use that when dust clings to
something, especially a vertical surface, that you have to use
something to dislodge it like a brush attachment before it is picked
up or put the hose right on it which does not do as good a job. You
really do not want to touch a mirror or sensor with the end of the
miniature vacuum tube so that you do not damage them. There is the
additional problem of build up of electrostatic charge on the
incoming dust by all the whirling dry air.
It seems to me the electrostatically charged brush is the most
reasonable approach if a low pressure blow from a clean, no residue
CO2 source does not work and wet cleaning if there are glued on bits.
We all like plug-in gadgets to make our lives easier, but sometimes
simple things just work better.
Winsor
Long Beach, California, USA
On Mar 3, 2007, at 9:50 AM, Brian Swale wrote:
>
> Hi,
>
> Somebody suggested that a miniature vacuum cleaner could drag in and
> deposit more dust that it removes - when cleaning camera mirrors and
> screens, etc.
>
> I don't believe this could be true. And by the way, if true, how is
> it that
> carpets are usually cleaner after being vacuumed than before?.
>
> Think about it. The concentration of dust in incoming air is
> extremely low.
> Probably much lower than for the mirror etc being cleaned. Also,
> incoming
> dust has by this time attained a velocity equal to that of the air
> it's in and
> there's no way it will escape that air train and avoid being caught
> in the
> cleaner dust-bag. The moving air and its contents ultimately are
> all going one
> way. Away from the camera.
>
> Brian
>
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