Hi All,

I've refactored the Build Filter Offsets Utility introduced in 3.6.5

Recap: What's are Filter Offsets?
There are 3 ways to Autofocus in Ekos. Here, I've setup an example that covers each:


1. Use Autofocus on the designated filter. In the example, Lum is configured like this. Whenever the Lum filter is selected in a sequence, Autofocus will be run on Lum.
2. Use Autofocus on a "lock" filter. In the example, Sii, Ha and Oiii are configured like this. Whenever Sii, Ha or Oiii are selected in a sequence, Autofocus will be run on Lum. When Autofocus completes (for example at 37273), Focus will apply the offset to go from Lum to, for example, Ha (in this case (-23 - 0) = -23 ticks. The focuser moves to 37273 - 23 = 37250 and Ha will again be selected in the filter wheel.
3. Don't use Autofocus but apply offsets on filter change. Red, Green and Blue have been setup like this. For example, when swapping from Red to Green, no Autofocus will be run and the focuser will from its current position (e.g. 37118) by the offset different between Red and Green. In this case, 4 - (-21) = 25 ticks. So the focuser moves to 37118 + 25 = 37143 and Green will be selected in the filter wheel.

So how do I setup Filter Offsets?
You can do it manually by running Autofocus several times and getting an average focus position for each filter. Then do the maths yourself to work out the offsets and enter these numbers into the Offsets column in the Filter Settings popup.

3.6.5 Introduced the Build Filter Offsets utility, launched from the Filter Settings popup by pressing the Build Offsets button. This helps to automate the process. See the Build Offsets section in the Focus section of the Kstars Handbook