Here are the transmission curves of all the filters we have at the Wheaton Observatory (WO). The transmission curves were generated by Judy Long (class of 2014) and Shereen Velupillai (class of 2015), using the high-resolution spectrometer in the Laser Spectroscopy lab (thanks to Prof. John Collins).

The CSV data for these can be obtained by emailing us.


  • Individual 1.25″ filters
Astr_Filter001.Sample.csv Astr_Filter002.Sample.csv Astr_Filter003.Sample.csv Astr_Filter004.Sample.csv
Astr_Filter005.Sample.csv Astr_Filter006.Sample.csv Astr_Filter007.Sample.csv Astr_Filter008.Sample.csv
Astr_Filter009.Sample.csv Astr_Filter010.Sample.csv Astr_Filter011.Sample.csv Astr_Filter012.Sample.csv
Astr_Filter013.Sample.csv Astr_Filter014.Sample.csv Astr_Filter015.Sample.csv Astr_Filter016.Sample.csv
Astr_Filter017.Sample.csv Astr_Filter018.Sample.csv Astr_Filter019.Sample.csv Astr_Filter020.Sample.csv
Astr_Filter021.Sample.csv Astr_Filter022.Sample.csv Astr_Filter023.Sample.csv Astr_Filter024.Sample.csv
Astr_Filter025.Sample.csv Astr_Filter028.Sample.csv Astr_Filter029.Sample.csv Astr_Filter030.Sample.csv
Astr_Filter031.Sample.csv
  • Filters mounted on filter wheels
Astr_Filter026_cyan.Sample.csv Astr_Filter026_magenta.Sample.csv Astr_Filter026_transparent.Sample.csv Astr_Filter026_yellow.Sample.csv
Astr_Filter027_blue.Sample.csv Astr_Filter027_green.Sample.csv Astr_Filter027_red.Sample.csv Astr_Filter027_yellow.Sample.csv
  • 1.25″ OIII filters (not so good)
Astr_Filter_OIII_001.Sample.csv Astr_Filter_OIII_002.Sample.csv Astr_Filter_OIII_003.Sample.csv Astr_Filter_OIII_004.Sample.csv
Astr_Filter_OIII_005.Sample.csv Astr_Filter_OIII_006.Sample.csv Astr_Filter_OIII_007.Sample.csv Astr_Filter_OIII_008.Sample.csv
Astr_Filter_OIII_009.Sample.csv Astr_Filter_OIII_010.Sample.csv