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mkk707: The sun on 20 July 2016
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mkk707: Cruising at 39,000 feet
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mkk707: The Sun on 28 March 2017
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mkk707: Testing a 500 mm mirror lens
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mkk707: I feel really small ...
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mkk707: So, why not simply use a telescope?
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mkk707: Full moon rising
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mkk707: Diagonal