We should all remember the difference between the very delicate coatings deposited onto a primary mirror, and the much tougher surfaces of eyepieces and corrector lenses. While care should always be taken, what Joe is cleaning is more akin to his eyeglasses than to the primary mirror. Blowing grit off is fine, and you never want to rub grit around on any glass surface, but for the corrector lens, there is no need to be quite so careful. Quoting Chuck Hards <chuck.hards@gmail.com>:
Excellent idea if your needs are relatively small, and you live close to a compressed-gas supplier. Since I use a lot of pnuematic tools with high volume and pressure demands, in addition to the airbrushes, compressed nitrogen is not an option for me.
On 5/7/07, Kim <kimharch@cut.net> wrote:
An artist friend of mine uses bottled nitrogen instead of a compressor for all of his airbrush work - no moisture problems, no filters necessary. For occasionally dusting off optics, this may not be practical, but if one is considering a compressor, do as Chuck did and install the appropriate filters.
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