Re: PHD 2 Guiding "Good Enough"
Ray Gralak
Hi Bryan,
That said, PEC in the mount is never perfect, and you will often see residual repetitive errors even when PEC isI would not rely on the PHD2 algorithm for most AP mounts. It will not be able to accurately predict any residual periodic error that could already be taken out by AP's PEC mechanism. It may be useful if there is periodic error not correctable by PEC because it doesn't repeat in phase every worm cycle, but there are very few cases where that might happen. Even then, It may not be very effective unless the residual error is truly periodic and you can wait for multiple periods for the phase and amplitude to be determined to reasonable accuracy. For example, the result may inaccurate because portions of continuous timeline tracking data may be missing while image downloading or dithering operations. Just check your PE every few months and update it if necessary. This will provide better overall results. (And a more advanced solution is coming. :-) -Ray Gralak Author of APCC (Astro-Physics Command Center): https://www.astro-physics.com/apcc-pro Author of PEMPro V3: https://www.ccdware.com Author of Astro-Physics V2 ASCOM Driver: https://www.siriusimaging.com/apdriver -----Original Message-----
|
|