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when airbrushes were first made they were ment for lacquer/inks paints,pigment's were ground very fine and lacquer being the carryer and thinner then water,,that's why their were so good for detail with the small dia needles. now along comes water based paints, heavy pigments and the carryer thats like milk, so larger dia needles were needed to shoot these new paints through the gun...when thinning down these new water based paints, you loose some of the true color because the pigments are spread out further apart....think in turms of pixels in a screen, so many dots per square inch..the finner the grain the better the picture.....it's got nothing to do with air..it's all about how fine/big the pigments are and whats used to carry the pigments....heavy= large dia neede...fine= smaller dia neelde.
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