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Filter Wheel

 
APT is able to control filter wheels that have ASCOM drivers as well as QSI and SBIG filter wheels through their native interfaces. To describe the filter names and offsets in APT rather than in the wheel driver see Filter Wheel settings tab.
 
This section gives manual wheel control. Note that imaging plans can be configured to change the filters during the plan execution. See Plan Editor section.
 
The filter wheel connection is used or can be used by the following APT features:
 
 
Filter Wheel
 
1

Connect / Disconnect

1.  Connect / Disconnect
 
When you connect an ASCOM filter wheel for the first time you will be asked to select the connection parameters by the standard ASCOM dialog. APT will remember your selection and when you click again on the “Connect” button it will use the previous settings automatically. If you want to change the connection parameters, use “Shift+Click” on the Connect button.
 
To connect SBIG filter wheel see Select Camera Type. Note that for SBIG wheel you have to use the Filter Wheel settings tab to describe the installed filters.
 
The QSI internal wheel is connected automatically on camera connection.
 
To "connect" a manual filter wheel or filter drawer you have to enable the option in the Filter Wheel settings tab.
 
2

Settings

2.  Settings
 
Opens the settings dialog of the ASCOM driver. If this action is not supported by the driver, use Shift+Click on Connect button and then click Properties in the driver selector dialog box.
 
3

Current Filter

3. Current Filter
 
Shows the current filter name.
 
This information can be also found in the Status section in the Main screen in order to save you tab switching just to see the current filter.
 
4

Go to filter

4. Go to filter
 
List box with all installed filters that allows selecting directly the desired filter instead of scrolling. Note that Moravian Instruments filter wheels will make the actual movement before the next exposure.
 
When manual wheel or drawer is used, it just changes the select filter name after the filter is changed manually.
 
5

Previous / Next

5.  Previous / Next
 
Goes to the Previous / Next filter. Note that Moravian Instruments filter wheels will make the actual movement before the next exposure.
 
When manual wheel or drawer is used, these buttons just change the select filter name after the filter is changed manually.
 
6

Adjust focuser

6.  Adjust focuser
 
When is active (high-lighted) if there are entered focus offset for the filters in Filter Wheel settings tab or in the ASCOM/QSI properties and if there is connection to Focuser, then APT will adjust the focuser position on every filter change.
 
This option could be used even with manual wheel or drawer.
 
7

Applied Offset

7.  Applied Offset
 
Shows the applied focus offset on the last filter change. Needs Adjust focuser to be enabled, connection to a Focuser and defined focus offset.