Filter Wheel

The APT Settings dialog box is accessible from Tools tab or with Alt+S shortcut.
The filter wheel settings tab contains options related to filter wheel. Here you can enter the filter names and focus offset for the filters mounted into your wheel. Describing the names here allows APT to show them in the Plan Editor and in the Camera tab (the selected plan table) rather than using the filter position number. This tab is required for SBIG and manual wheels, but it will be more comfortable for you if you enter the information even if you use ASCOM / INDIGO / INDI compatible wheel.
Note that if there are values in this tab APT will ignore the values entered in the properties of the ASCOM driver.
Filter Wheel

Filter Name

1. Filter Name
Defines the filter name you want to use.

Focus Offset

2. Focus Offset
Defines the focus offset that you want to apply when this filter is selected. Not all filters are para-focal, so if you measure the exact difference in the focus between the filters (in steps of your focuser) it can save you the refocusing on every filter change. To use this feature you need Focuser connection and enabled "Adjust Focuser" in Filter Wheel section of Gear tab.
The value 0 means that there is no offset.
The focus offset has not thing with the black level/offset.


3. Gain
Defines the gain value that you want to apply when this filter is selected. Empty value means that gain value should not be changed. This value will be used with priority during imaging plan. During LiveView or Shoot image if the Gain value in Camera tab is not empty it will be used with priority.

Clear All

4. Clear All
Clears all values entered in Name and Offset fields.

Moravian Filter Wheel

5.  Moravian Filter Wheel
Enable this setting if you are using filter wheel made by Moravian Instruments.

Auto Connect Wheel

6. Auto Connect Wheel
When enabled on starting, APT will try to make connection to the last used filter wheel.

Manual Wheel / Drawer

7. Manual Wheel / Drawer
Allows usage of manual filter wheel or filter drawer. Enable this option, enter the installed filters names (and offsets), then click on Connect Wheel button in the Gear tab. The main purpose of this feature is to add the right filter name prefix in the image filenames for easier processing. It also can be used to adjust the focuser position on filter change using the entered offset.

Pause for Manual change

8. Pause for Manual change
When this option is enabled, APT will show dialog box every time there is need to change the filer of manual filter wheel or drawer during plan execution. Clicking on OK will resume the imaging.
Note: Give few seconds the guiding to settle after filter change.

Check for connection

9. Check for connection
When this option is enabled, on plan start APT will check if that plan is configured to use filters and will warn if there is no active connection to a filter wheel.