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"Pointy Pleiades"













  Object "Pointy Pleiades" (M45), Open Star Cluster, in Taurus
  Telescope (Photo) Televue 85 refractor w/0.8 focal reducer (f/5.6)
  Telescope (Guiding) Meade LX200GPS 12" SCT @ f/6.3
  Camera (Photo) Canon 20Da DSLR
  Camera (Guiding) Meade DSI Pro II w/PHD Guiding
  Exposure Detail Median combination of 9 images at 120 seconds each, ISO1600; RAW file conversion, full calibration (bias, flat, dark), and initial image processing using ImagesPlus 2.82; final image processing using Photoshop CS3
  Location Private Property at Chiefland Astronomy Village, Florida
(N29.406, W82.860)
  Date 11/09/07
  Comments This picture was created using a 3-hole aperture mask over the objective lens.  The mask holes were triangular and were rotated at 30-degree angles from one another, which caused 18 evenly-spaced diffraction spikes to radiate from each bright star's core.