Quote:
Originally Posted by [1ponders]
If both systems are not each exactly 90 deg to the RA axis then they are non-orthogonal. This means that each imaging system will scribe a slightly different arc through each exposure even though the guiding system is working fine. I'm no mathematician but i remember doing some work with Gary Kopf at Astrofest one year trialing an AN update and it was one of the things we were working on modelling. I'm sure he would know more about it (as I'm sure plenty of others here would as well) so maybe drop him a pm?
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thanks paul i think you have fixed mine too!
i tried to get the same image through my lodestar as i do on my exposure in my 60da
at the same time i attempted native f10 imaging and i got elongated stars so i immediately thought it was because my lodestar was at 500mm and my SCT was at 2800mm
i inadvertantly made the orthogonality (great word) worse
makes perfect sense.... thanks paul i will try and align them better now
pat