Calibration frames

No clear sky so this night has been devoted to calibration frames acquisition for all my 2x2 bin images. Standard calibration requires bias, dark and flat reference image to clean up an image from noise and optical/geometrical artifacts.

A lot of bias (74 of them...) median stacked give this master bias frame:

(click to enlarge)

Master dark frame (median of 60 frames, -15 C, 60 seconds each...):

(click to enlarge)

Master flat frame (median of 90 frames) obtained using a 14" elettroluminescent flat panel:

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Some dust donuts.....smaller donuts are from the sensor window protection glass, larger ones are from the filters in the filter wheel.

Using those master frames should keep my images cleaner....I hope so!!!...

M10

Working on autoguide and correctly balancing my eq6, I tried this globular cluster.
It is a median combine of only 3 single 300 seconds exposure, central crop of the frame:

(click to enlarge)

Technical data: GSO 10" RC f/8 (2000mm) on Eq6 + TDM / CCD Sx H694 + 1"1/4 semi APO filter + Sx AO-LF + Lodestar autoguided

M3

Takahashi collimator is still in Japan!!!......so my RC collimation is not good....I'm trying to do my best using only the stars but it seems that is not enough!!!

This is a median sum of 12 x 180 second frames:

(click to enlarge)

Technical note: GSO 10" RC + Eq6 + TDM + Sx AOLF

I have to work harder!!!....the RC can give much better results.....