Addendum - Optical Filter

Optolong L-extreme Filter

updated: 2022-09-13

Nice filter for color OSC CCD or DSLR cameras: Optolong l-eXtreme filter, best suited for emission nebulas

  • 2-band 7nm bandpass filter (h-Alpha and OIII
  • for use with one-shot color cameras like DSLRs
  • blocks most light pollution, by city lights or even the moon
  • maximizes contrast and signal to noise  ration 
  • available in 1,25" and 2" size

Astroshop: Optolong Filters L-eXtreme 2" (

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