Instrument is used to select observations based on which instrument was used for making the observation. You must uncheck Ignore to select an instrument from the combo box.
Eyepiece is used to select observations based on which eyepiece was used for making the observation. You must uncheck Ignore to select an eyepiece from the combo box.
Barlow/Compressor is used to select observations based on which barlow or compressor was used for making the observation. You must uncheck Ignore to select an barlow or compressor from the combo box.
Camera is used to select observations based on which camera was used for making the observation. You must uncheck Ignore to select a camera from the combo box.
Filter is used to select observations based on which filter was used for making the observation. You must uncheck Ignore to select a filter from the combo box.
