PPA system on Ekos make 3 shoots on different sky position, moving the telescope in RA.
The iPolar scope is installed on same axis of RA and it rotate uppon this axis, but its position is the same at the start and at the end of the procedure.
You coult use it, by manually identify Polaris star and trying to move it to the center of the filed, using azimuth and altitude screws.
"The iPolar scope is installed on same axis of RA and it rotate uppon this axis", that's all that is needed by the PAA. It looks at the different fields (the rotation is used to determine the center of rotation) and computes how far is this center of rotation to the real pole (I'm using PAA for more that a year).
So, I'm completly puzzle about why it doesn't work.
I used the CEM70 for the first time few days ago, and before i used the EQ6.
When you run the PPA it suggest a movement to WEST of 30degrees and it move 2times and take 3pictures to calculate the polar deviation.
If you use the iPolar, you dont use the movement of 30+30degrees, but probably you have at the end a movement of few degree.
Greatest is the movement more precise should be the calculate of the polar deviation.
This is just my opinion
That point is what I don't understand. If the iPolar scopenrotates with the RA axis, and the PAA tries to rotate this axis 30º+30º, you will get three images rotated 30º between them, so, the PAA should be able to use those images to find the alignment.
You obtain 3 images but on rotated basically on two same axis RA and DEC, because it is linked to the mount itself.
instead i use my main camera connected to the telescope and use PPA procedure, in this case you have a movement that is suitable for a better calculation of the PA
If you don't have a significant cone error in your mount, rotating your main scope or the iPolar on the axis are about the same: frames rotates around the point in the sky your RA axis is pointing to. Both set of pictures will be equally useful to perform the calculation needed.
As you have the iPolar, could you be so kind to try it? It should work.
How can IOpron app manage to quickly plate solve with this camera then?
Currently I can select the IPolar as sensor. The only thing missing is the correct FOV which can be filled in manually. (I often do that when using a barlow). I wonder if I select the guide scope (120mm) to get closer to the focal length of IGuide, Will not the astrometrics be able to find the actual FOV ?. For instance train it with a couple of solves (without slew or sync) I will try this next clear night.
In KStars 3.5.4, the DMK driver see iPolar as device, probably because the DMK driver does not read the device specs, but it onlu look at /dev/videoX device.
After about 1hour to check all usb connections, reboots, changes of SD cards and other, it have to reset DMK configuration file then change the device port do /dev/video2