Taken 1-Mar-11
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M3 globular star cluster in Canes Venatici

Test on the globular cluster M3 with an unmodified Nikon d3100 DSLR on a FSQ-106ED (f/3.65) telescope. Exposure: two shots with 100 seconds each. Software: Aperture (Mac) for histogram corrections, MaximDL for aligning and adding the subframes.
NIKON CORPORATION NIKON D3100, f/1 @ 0 mm, 101s, ISO 400, No Flash

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M3 globular star cluster in Canes Venatici