https://bugs.kde.org/show_bug.cgi?id=472609

--- Comment #2 from John Evans <john.e.evans.em...@googlemail.com> ---
(In reply to Matteo from comment #1)
> Created attachment 160511 [details]
> Guide & Focus Limits

Hi Matteo,

Your proposal sounds interesting. I'm currently thinking about a different but
possible related request from someone interested in photometry who would like
to focus on a reference star before imaging a different target star. So I'm
thinking I might be able to do something that works for both of these
requirements.

What I'm thinking (and these are very preliminary thoughts) is that I could
introduce the concept of "Focus Target" to complement the current "target"
(which is really a "Capture Target") that can be set in the skymap, scheduler,
etc. For most folks the "Focus Target" and "Capture Target" will be the same,
as they are today in Kstars. So:

Setting up a scheduler run would then require a "Capture Target" and an
optional "Focus Target" to be setup. If there is no "Focus Target" then Kstars
operates as now.

If a "Focus Target" is set then...
1. A focus run would become:
a) Align to "Focus Target"
b) Run Autofocus
c) Align to "Capture Target"

2. When focus limits, e.g. time are reached,
a) Align to "Focus Target"
b) Run Autofocus
c) Align to "Capture Target"

The Scheduler has functionality to coordinate Align and Focus so would be good
to utilise that.

The Autofocus would more or less use the current functionality:
1. If multi-star focusing then after alignment just run focus as normal.
Autofocus failures would be handed back to the scheduler as now.
2. If single-star focusing then Align will tell (somehow) which star to use
(star nearest the centre of the FOV) or the user selects the star as
appropriate. This bit needs more work.

The reason I think a user specified target will work better than have Kstars
try and work out a suitable star above a certain magnitude is that there are
endless reasons why Kstars will pick a suboptimal star from the user's
perspective (star too bright and saturates, star too low in the sky, tree in
the way, star too near Moon, etc etc). No doubt these issues can all be coded
around but I think its easier to let the user select the "Focus Target".

Anyway, these are just some initial thoughts. I'd be interested to hear your
thoughts.

Best,
John.

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