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So, no one participating on this thread has actually seen any grado blown on a mirror from an air compressor? Interesting.

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We have a compressor in our garage--for mechanical work (we have eight motorcycles). The thought occurred to me to use it to blow off optics a long time ago--but after seeing what a nice test blast did to a fresh piece of white paper i gave it up! Water and oil mostly it looked like, quite a mess; i'm told that this stuff typically accumulates in the tank & hose in ordinary garage compressors and one needs a filter gizmo at the hose end to effectively capture it. So yes, i've seen gunk coming from air compressors-- just not on my optics.

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Mardi




4" achromat, ETX-70.
Whitepeak Lunar Observatory Website

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