This movie is very instructive for showing just how deep into the areogel we are looking when we shift focus from top to bottom, and demonstrates the narrow depth of field this camer has.
http://stardustathome.ssl.berkeley.edu/ ... e_id=49865
Focus on that piece of dust that landed half way into the crack in the areogel.
Notice how you only have to move the focus up or down about 3 lines
on the slider to totally make that spec fuzz out of focus and disappear.
Depth Demonstration Movie
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