M51, Imaged with an
AP 10" f/14.6 Maksutov-Cassegrain
Image taken at prime focus with an AP 10" Mak-Cass, ST10E, Color Filter Wheel,
one each 10 minute exposure of RGB, 3x20 minute L. Also employed was an experimental
f/11 compressor/field flattener.
Image by Roland Christen of Astro-Physics
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