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        - Main camera: Apogee ALTA U16M (KAF16803) + Flattener 67 -> 1.68"/pix
        - Guiding camera: ATIK 314L+ in bin 2
        - Filters: L-RGB-Ha-OIII-SII Astrodon Gen2
        - Refractor: TAKAHASHI TOA150 - Focal length 1100mm
        - Mount: mini-OHP with MCMT system
        - Dome: Scopedome 3m
        - Integrationn, pre-treatment and treatment: PRISM v9, IRIS and Photoshop
  Ldn 557
  Main object
LDN557
  Catalogue    Lynds Catalog of Dark Nebulae
  Autres objets    - LDN 557 -
  Month    August
  Year    2017
  Constellation    Serpens
  L    480 (8 hours and 0 minutes)
  RGB    360 (6 hours and 0 minutes)
  Ha    600 (10 hours and 0 minutes)
  O3    0
  S2    0
  Total    1439 (23 hours and 59 minutes)
  Format    1x1
  Number    81
  Link    Full size picture
  Link    Labeled picture
  Note    The idea of this picture has been given tu us by Sakib Rasool. Annotated picture by Sakib Rasool.
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