Celestial hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  16 Tau  ·  17 Tau  ·  18 Tau  ·  19 Tau)  ·  19 q Tau  ·  20 Tau  ·  21 Tau  ·  22 Tau  ·  23 Tau  ·  24 Tau  ·  25 Tau)  ·  25 eta Tau  ·  26 Tau  ·  27 Tau  ·  28 Tau  ·  Alcyone  ·  Asterope  ·  Atlas  ·  Barnard's Merope Nebula  ·  Celaeno  ·  Electra  ·  IC 349  ·  IC 354  ·  M 45  ·  Maia  ·  Maia Nebula  ·  Merope  ·  Merope Nebula  ·  NGC 1432  ·  NGC 1435  ·  And 14 more.
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M45 Pleiades, Jason Coon
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M45 Pleiades

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M45 Pleiades, Jason Coon
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M45 Pleiades

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Description

The Pleiades in OSC with a RASA 8.  I believe the circles around the brightest stars are due to internal reflections in the Optolong L-Pro filter.  I've stopped using my L-eXtreme for similar reasons but this is the first time I've seen this in the L-Pro.  Initially I did 30s exposures and thought maybe that was the issue, however they are nearly as prominent even with 10s exposures.  I think I need to find a new broadband light pollution filter for the RASA.

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M45 Pleiades, Jason Coon