>In a message dated 7/13/01 9:41:37 AM Pacific Daylight Time,
>johnsonpa@xxxxxxxxxxxxxxx writes:
>
>> be careful with the compressed air. You can shoot dust into
>> the elements of a lens if you try hard enough. I suspect the same goes for
>> a camera body too.
>
>That possibility occurred to me, too. I wonder if that isn't how some of
>that dust has gotten into the used lenses we buy. I'm really careful to blow
>ACROSS the surface of the lens, from about six inches to a foot away, not AT
>the lens, to try to minimize the possibility of forcing dust, grit inside.
>
>The real bugger seems to be those recessed rear elements. Anybody have a
>killer technique for that?
>
>Rich
Very long 'cotton buds' used for medical swabs (I married a pathology nurse!).
Oh, and be careful of some 'compressed air' - one I bought here in Aus.
without due care and attention is a can full of hydrocarbon propellant -
probably propane or butane, called Aerosolve (locally made). Consequently,
it is highy flammable and enthalpy causes it to chill down anything it
hits, as well as leaving a film. Major health hazard and could damage
lenses or film seriously. Despite this, it's marketed for cleaning
photoequipment and film for scanning!
Alcohol for cleaning? - good on bodies but for glass - WINDEX repeat WINDEX
on a Johnson and Johnson pure cotton bud. It works much better (and I used
to use lab grade ethanol).
AndrewF
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