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Author Comment Last activity Moderation
marlokeno "Thanks! " | Read more » over 3 years ago
marlokeno "OK, I found some promising links- https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA21964 This link includes an example inset of part of San J..." | Read more » over 3 years ago
marlokeno "Hi- As noted above, chalk, e.g. chalk dust in classrooms, and cement manufacture, are major sources of calcium carbonate pollution. Cement manufac..." | Read more » about 4 years ago
marlokeno " My first suggestion is to photograph on a cloudy day. Compensating for the sun is difficult. A polarizing filter helps, as does a uv filter, but ..." | Read more » over 4 years ago