After a lot of time I processed data taken on september and october of 2011. This image is mosaic of 9 images (3x3). HDR composition is made from 5x900s and 10x120s. Data were aquired with TMB 135/780 (+ flattener) and CCD camera G2 8300 (Moravian Instruments) cooled to -30°C.
Processing steps:
calibration (Astroart, other steps done with PixInsight)
removing gradients from separate images
registration
gradient merge mosaic
removing residual gradients
histogram stretch
HDR multiscale transform
local histogram equalization
multiscale median transform for noise reduction
clone stamp (removing trails from few satelites)
Here is the image, after click is available 50% version. Original cropped mosaic is 8790x6265px large.
