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Sidereal vs King rate

Jamie Amendolagine All Messages By This Member #67102 So which choice is better for imaging? Or are there situations where one is better than the other?? Jamie
Les Niles All Messages By This Member #67103 开云体育 For most solar system objects, neither rate is correct so it doesn’t much matter which you use.? If you’re shooting short subs, it won’t matter because the rates are very close, and aligning the subs will compensate for differences due to refraction.? If you’re shooting long subs, you should be auto guiding, so it won’t matter which you use for the base tracking rate. ? If you’re using a 492 digital drive, its King rate is just an average refraction compensation, not particularly accurate for most positions. ?King rate should be marginally better, but really you want to either shoot short subs or auto guide. ?Or both. ? I don’t know if the Gemini implements position-dependent King rate; if so, it would in principle be better for unguided imaging with subs on the order of a minute or longer. ?In any case, if the mount is properly set up, King rate shouldn’t be any worse than sidereal for objects outside the solar system. ? ? -Les toggle quoted message Show quoted text On 12 Jul 2020, at 22:20, Jamie Amendolagine <jamie.amendolagine@...> wrote: So which choice is better for imaging? Or are there situations where one is better than the other?? Jamie
Brian Valente Member Profile All Messages By This Member #67107 Hi Jamie it's kind of six of one, half dozen of another generally most folks use sidereal. King Rate accounts for atmospheric refraction but isn't terribly helpful if you are imaging higher in the sky (>30 degrees?)? Guiding usually takes care of any changes in apparent star motion as well toggle quoted message Show quoted text On Sun, Jul 12, 2020 at 10:21 PM Jamie Amendolagine <jamie.amendolagine@...> wrote: So which choice is better for imaging? Or are there situations where one is better than the other?? Jamie -- Brian? Brian Valente portfolio
Sonny Edmonds #67115 Since I live in a democracy, I stay away from King rate. I think it is Imperialistic... But, I could be wrong. ;^) -- SonnyE (I suggest viewed in full screen)
Paul Homer All Messages By This Member #67116 开云体育 Sonny, You can live in a democracy and still have a King or a Queen for that matter, they are not mutually exclusive :) Paul toggle quoted message Show quoted text On 14 Jul 2020, at 6:02:27 am, Sonny Edmonds <sonnyedmonds@...> wrote: Since I live in a democracy, I stay away from King rate. I think it is Imperialistic... But, I could be wrong. ;^) -- SonnyE (I suggest viewed in full screen)

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