Most options are self explanatory, but in the spirit of completeness, all are listed below:


  • Filter: Order events, by Filter Name (alphabetical order, ascending). The order is typically not important (but maybe). Usually, the importance of this option is related to “grouping” by filter in order to minimize the number of filter changes required during the AutoFlats run.
  • Narrowband toward light (for sky flats): Order Flat Events in such a way that narrowband filters will be processed during the period of time that has the greatest amount of light. In other words, if you are taking “Dusk Flats”, narrowband events will appear before broadband events and, conversely, if you are taking “Dawn Flats” narrowband events will appear after broadband events.
  • Binning (numerical, ascending): Order Flat Events in such a way that mode “1x1” appears first and “4x4” appears last.
  • Binning (numerical, descending): Order Flat Events in such a way that mode “4x4” appears first and “1x1” appears last.
  • Target Name (alphabetical, ascending): Order Flat Events alphabetically, by Target Name where Target Names that occur earlier in the alphabet will run before those that occur after it.
  • Target Name (alphabetical, descending): Order Flat Events alphabetically, by Target Name where Target Names that occur later in the alphabet will run before those that occur before it.
  • Rotator Angle (numerical, ascending): Order events by the specified Rotator Angle. Usually, the importance of this option is related to “grouping” by angle in order to minimize the amount of Rotator movement required during the AutoFlats run. It can also help to enforce the direction that the specified position is approached from.
  • Rotator Angle (numerical, descending): Order events using the same method described above, but order by angle from highest to lowest.
  • Most Complete: Order such that Flat Events that are closest to completion will run before those that are furthest from completion. This sorting option considers an event’s completeness as a percentage of its total frames that are finished.
  • Least Complete: Order such that Flat Events that are furthest from completion will run before those that are closest to completion. This sorting option considers an event’s completeness as a percentage of its total frames that are finished.
  • Active / Inactive: Order such that Active (checked) Flat Events appear in the list prior to those that are Inactive. This ordering has no bearing on actual capture order, it is just useful for visualization.
  • Focus Position (numerical, ascending): Order events by the specified Focus Position. Usually, the importance of this option is related to “grouping” by Focus Position in order to minimize the amount of Focuser movement required during the AutoFlats run. It can also help to enforce the direction that the specified position is approached from.
  • Focus Position (numerical, descending): Order events using the same method described above, but order by Focus Position from highest to lowest.


Adding a new ordering property will automatically cause the Flat Event list to re-order itself. That said, sometimes Flat Event property is changed in a way that will affect its order in the list, but because it is disorienting to modify a Flat Event property and then have that Flat Event suddenly move to a new location, the Flat Event will temporarily remain in its current position. You can request a re-ordering of events by clicking the button found below the Flat Event list.


The re-order manually button:



Note: In the case where changing Flat Event properties that affect ordering never performs a re-ordering prior to capture starting, AutoFlats will perform a final re-ordering before beginning.


Note: The reason AutoFlats does not use standard “column clicking” to set order is because AutoFlats provides sorting options for properties that are not visible in the Flat Event list.