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I purchased a cheap f/8 500mm refractor lens for my Canon 300D from eBay and gave it a shot on M13 and M57. Here is the result for M13. The nice thing about the lens is that it is fairly well in focus if focused on infinity. This is a stack of 14 images, ISO 200, total exposure time 33 minutes and 13 seconds. The result is not too bad. I think next time I try shorter exposure times and higher ISO settings (e.g., ISO 1600). Taken June 5, 2011 in our front yard in light pulloted Iowa City.
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