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Noisy 3hr Helix
Very noisy crop of the Helix. Only 3 hours of Ha (5nm) through my ED80 with a ZWO1600MM-Pro in pretty bright misty conditions. Pushed the HEQ5 mount with 15 minute subs (12 in all) guided with a finderguider. The very first sub was okay but as it approached Zenith the stars become much more oblong as guiding became slightly more erratic. Is this a case of the mount’s capabilities, as my googling suggests, or can something be done to solve this problem: hyper tune, turning off Dec guiding, weighting the mount in a particular direction (have belt moddded the mount), OAG? Managed to warp the stars into some kind of shape. Was hoping to get some OIII but clouds and events will delay this a week or two. Appreciate thoughts on imaging near Zenith in particular.
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