My gut says Unity Gain.I think this will work well, but I need to decide whether to set the smart brain to analyse for Unity gain or Max DR.
Brian
My gut says Unity Gain.I think this will work well, but I need to decide whether to set the smart brain to analyse for Unity gain or Max DR.
Hi Robin, thanks for chipping in. So you're saying yes, run the smart brain analysis in the fov you are imaging (your target), but perhaps use the selection box to select the darkest area in that fov?admin wrote: ↑Thu Sep 13, 2018 5:02 pm I feel that you are over-complicating things here - the Brain measurement needs to be run on something at least as dark as the darkest area in the field of view you are imaging - that will ensure that you get a gain/exposure combination that is not being affected by camera read noise. H
Brian thanks, I was thinking about the effects of atmosphere and running it again when your target has significantly changed altitude and position, but I think running it regularly might wreak havoc with what master darks you can use. Unless you're up for re obtaining them every time..oopfan wrote: ↑Thu Sep 13, 2018 3:21 pm In Photometry there is a quantity called Airmass which is a function of zenith distance. Airmass affects the calculation of photometric magnitude by noting that the atmosphere reddens the color of a star.
We can extend this to AP by frequently rerunning The Brain on the same rectangle of dark sky and then using that calculated exposure for the next period of time.
How often should you resample? I would say at least once per hour. I know that Chuck from Chuck's Astrophotography has his SGP set up to refocus every half hour.
Brian