Does anyone know how Maxim DL computes ensemble photometry? I would like to know if this software gives all stars in an enseble the same weight as AIP4WIN does. I would also like to know if Maxim DL excludes some percentage of pixels from the computation of the sky background. I can recall that AIP4WIN excludes the brightest and faintest pixel values from the sky annulus (+/- 20%) so that it can reliably compute the value of the sky background in case of intrusion of unwanted stars in the sky annulus with the single exception of the most crowded star fields.
Finally I would like to know where I can find equations to transform instrumental magnitudes, obtained with an ensemble, into the standard system. I am using the Sarty's equation to apply the transformation coefficients of my system but I am using the traditional approach with one comp and one check star at the moment.
Thank you for your help