On 19 Aug 2004, at 17:40, prodig-digest wrote:
Use a much bigger can, keep it warm (not hot!) and don't tilt it.
Aaaaaaargh! Boyles Law or some such tells you that as you release pressure on any gas it cools. Pressurized gas / air in a canister expands very rapidily as it leaves the nozzle and is very cold - so cold in fact that apparently it can form ice crystals. You and I cannot see them as they are microscopic and actually heat up very rapidly in contact with the surrounding air but it is the effect of these micro-particles hitting any surface, especially a warm one which leaves those ghastly "doughnut" shaped rings one then sees when looking at "Actual Pixels".
If you watch the professionals cleaning cameras they use pumped, filtered air. The only real thing we need to know is never, ever point any compressed air source in any form of can, canister or whatever at an imaging chip.
And beside which why blow when we should really be sucking!
Enjoy the light
Mike Sheil
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