Tried again today and got to the stage where Ekos Solved 3 images and asked me to select a bright star. However, I didn't quite understand that part, and the videos I have seen don't seem to have the same interface I am seeing. Are there any Polar Alignment videos based on the current version of Ekos out there?
Right, did some testing again today; and yet another failure to launch
Switched to a 100mm lens and started the PA process. Ekos solved the first image, and the following two after asking me to rotate the mount. And then it just hung there on solving WCS (or something like that) before crashing. So close yet so far.
Rebooted the Pi, and could not get Ekos to solve even one image over the next two hours or so. Even tried with another cpoy of kstars / ekos on another USB drive.
What am I doing wrong?
hi Rob, were you able to look into this?
Your updates are not reflected in the Raspian version, could you please look into this?
El Corazon wrote:
Those are beautiful star trails.
With your imaging camera, you will most likely be best served using focal lengths between 200 and 300 mm for polar alignment.
That just has to do with the databases you use for analyzing the images. The more stars there are, the more confusing the image becomes and the longer it takes. Conversely, the smaller the FOV the more plates the solver has to interrogate until it finds the right one.
You have to find the sweet spot for your camera. The optimal FOV lies somewhere between 10 degrees and 5 degrees. That FOV ensures the pole is within the image (unless you are REALLY pointing in the wrong direction), and that there is a manageable number of stars in the image.
E.g. the Polemaster has an FOV of ~11 x 8 degrees. My guide cam of ~ 1.8 x 1.2 degrees. Both work fine for polar alignment and solve within about 10 seconds on a Pi4.
So there is a wide latitude.
TallFurryMan wrote: With such a large field, if you assume your manual polar alignment and park position are roughly correct, you do not need to solve at all. Just slew to your target and overlook the plus/minus five degree error.
This said, I can totally understand you want to do things properly
The trails were shot at 24mm, but I use a 80 mm lens when trying to Polar Align. Will try a 140mm when we get a clear night again.
AstroNerd wrote: Well if it helps at all, I have never been able to get an image solved from around the pole...
I finally got to the point where I was able to test Polar Alignment with Ekos and an Olympus camera. Ekos shot the first image and solved it in about 90 seconds using Astrometry offline . I then got a message asking me to rotate the mount 30 degrees . I did so and clicked the button to confirm. Ekos then proceeded to shoot the second image and then... solver time out!!! Tried multiple attempts for the next hour or so, before giving up.
Nothing changes between the first image which is solved, and the next images which time out. Same lens so same FOV, and I even tried ASTAP with G17 database.
What am I doing wrong?
El Corazon wrote: 560 mm focal length is not enough for planets. You need about 10x that to get a decent resolution. Also, PA is really not that critical for shooting planets. That can be done even with an Alt/Az mount. You should be able to polar align just fine with your regular camera and lens as long as the field is not too wide. I would guess anything above 150 mm for your camera should work just fine, as long as the FOV angle does not exceed 15 degrees.
rlancaste wrote: I can take a look at it. Right now I'm a bit bogged down with other projects. But it is getting into the summer now and I should have more time since my students are almost done.
knro wrote: I've updated it now in both the official INDI PPA and also in StellarMate. Please update.
I will be using a camera with a 560mm Telephoto lens,and the overall weight is less than the payload capacity of the SA.
El Corazon wrote: What mount do you have? Is the polar scope not an option?
I know it takes more practice than aligning to the NCP, but with a wide-field setup, you can probably get away with 30' deviation.