Sketch, 1999/9/11, with 3.5" Questar, 16mm EFL eyepiece. Observed from Greene County, Pittsburgh. M20 is the nebula to the upper left. No dark lane, no color. M21 is the open cluster to the lower right. The circles are field-of-view.
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All images by Jerry Xiaojin Zhu unless noted otherwise. Feel free to use them for your personal enjoyment. For other usage please contact the author at jerryzhu@gmail.com
