Dust Removal

[Sandy Gray <sandy@xxxxxxxxxxxxx>]

Hello fellow scanners

>From my many years of servicing medical and scientific equipment I
make the following comments.

I am not familiar with scuba air - but imagine it would be equivalent
to breathing grade compressed air in a commercial cylinder. It will
probably contain moisture (else the breather will become dehydrated)
and possibly a small amount of oil (vegetable or otherwise) Whilst
this has to be very low for safety when breathing it, it or the
moisture may contaminate fine optics. I don't know if compressed dry
nitrogen is available in the US in small cylinders (it used to be in
Australia) but when regulated to very low pressure is definitely the
best option. Failing that I would use a camera blower brush (minus
brush plus extension tubing) as this will give a gentle but CLEAN flow
of air.

Alternatively if you must use scuba air, use a small filter comprising
a glass tube containing cotton wool (or surgical grade gauze) with
some silica gel and use it to dry the air stream before submitting
your optics to it. Make sure to purge the system of gel dust before
using

Hope this helps - I find the list very rewarding and am happy to be
able to finally make a contribution

-- 
Best regards,
 Sandy                            mailto:sandy@mcgray.com.au

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