c
Il n’y a aucune raison que ce soit normal, vu que ce n’est pas sûr les mêmes trains optiques.
tu fais une focalisation toutes xminutes, y a t-il vraiment des différences notoires surtout si c'est avec la petite lulu ?darki a écrit : ↑05 sept. 2025, 07:58Il n’y a aucune raison que ce soit normal, vu que ce n’est pas sûr les mêmes trains optiques.
Mais ça doit arriver car NINA possède une case à cocher pour arrêter le guidage pendant la focalisation.
Et heureusement parce que je parlais de refocalisation auto toutes les x minutes et comme c’est un trigger, ben pas possible de faire des actions.
Cette case sert essentiellement à stopper le guidage quand on utilise un OAG. Si on guide à la lunette en parallèle, je ne vois pas spécialement l’utilité, sauf dans deux cas
Vu que ailleurs je ne peux rien régler sans changer du matériel, ça va quand même me servir
sinon autre possibilité dans les tâches arrêt guidage, focalisation, reprise phd ,reprise des captures un peu lourd...
et le paramètre qui arrête le suivi dans les options de focalisation.
c'est exactement ce que @Olivier-Fantasy disait : le guidage c'est facile (quand ça marche
) Vas-y, envoie
C'est quoi une calibration ?
Non jamais touché, du moins pas dans cpwi.
il y a un réglage du backflash mais pas du jeu, le jeu si c'est possible de le régler ce sera mécaniquement
C'est pas plutôt un capteur qui compte les tours de vis sans fin , ce qui servirait de repère pour le retour à la position Home.
Train PEC - Errors are inherent in all worm gears. Periodic Error Correction (PEC) improves the tracking accuracy of the RA
motor drive by reducing the amplitude of your mount’s particular worm gear errors. Not all Celestron mounts support PEC. Train
PEC will not appear as a selection if your mount doesn’t support it.
Using PEC is a three-step process. First, the mount needs to fi nd the worm gear “index position” so it has a starting point
reference when playing back the recorded error. Next, you must autoguide your mount’s tracking using an autoguiding camera
(i.e. an “autoguider”) for at least 10 minutes – about the time it takes for a full rotation of the worm gear. During this time, the
mount records the corrections made by the autoguider; this is the “Train PEC” process. This “teaches” the periodic error
characteristics of the worm gear to the mount. The periodic error of the worm gear drive is then stored in memory. The fi nal step
is to playback the periodic error corrections made during the training process during regular tracking. This will greatly reduce
the overall tracking error in the system. PEC is intended for advanced astrophotography and will still usually require autoguiding
during imaging when used. However, the autoguider will no longer need to make large amplitude tracking error corrections,
ensuring pinpoint stars in the fi nal image.
To train PEC, fi rst make sure the telescope has been accurately polar aligned. We recommend using the All-Star Polar Alignment
(ASPA) functionality described earlier in this manual. Once polar aligned, follow these steps:
1. Find a bright star relatively close to the object you want to image.
2. Insert the autoguiding camera into the eyepiece holder of your telescope and connect the camera to your computer.
Orient the autoguider so that one axis of the sensor is parallel to the declination axis while the other is parallel to the
R.A. axis.
3. Focus the telescope so the stars in the autoguider are in sharp focus on your computer screen.
4. Connect the autoguider’s guiding output port to the autoguider port on the mount’s electronics panel using an ST-4
compatible autoguider cable.
5. Confi rm that the autoguider is working to guide the mount.
6. To begin recording the drive’s periodic error, select “Train PEC” from the Utilities section of the Menu. Click on
“Begin PEC Training.” The fi rst time each observing session that PEC training or playback is selected, the worm
gear must fi rst rotate to its index position. If the worm gear rotation moves your guide star outside the fi eld of view of
the autoguider, the guide star will need to be re-centered before the recording begins. In some instances, it may be
necessary to restart PEC recording after the worm gear has found its index. Do this by clicking “Cancel PEC Training”
and then click on “Begin PEC Training” again.
7. After 10 minutes, PEC Training will automatically stop recording. PEC will now be active (i.e. PEC playback is now on).
Click on “No, Stop training PEC” in the pop-up window to fi nish. If you would like to redo the PEC Training, click on
“Yes, Stop PEC Playback.” You can repeat the entire process; the previously recorded PEC data will be replaced with
the new PEC data.
You are now ready to image using PEC. If you would like to disable PEC playback, then “Confi gure Mount” from the Mount
section of the Menu and deselect the “Enable PEC playback” box in the PEC area of the Mount Confi guration window. Does the
PEC function make unguided astroimaging possible? Yes and no. For shorter exposures with shorter focal length telescopes,
the answer is yes. However, even with PEC, autoguiding is still mandatory for long exposure deep sky astroimaging with longer
focal length telescopes
