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Gibraltar Amateur Astronomers Society

The Gibraltar Amateur Astronomers Society was created in 2013.

​It was founded with the sole purpose to learn and sharing knowledge. We are a
 group of people of all ages who are interested in the science of astronomy. While many are accomplished observers and astrophotographers, others are new to the hobby. GAAS tries to respond to all levels of interest. Various members own large telescopes with difference equipment attached to them. On the other hand, some members don't own any telescope at all, but simply enjoy observing the night sky with their unaided eyes. GAAS meets each month. The meetings are free and are open to the public
.

The society is very active with observations and astrophotography in Gibraltar and nearby Spain. 
​

A society for everyone

Calibrating a CMOS - ZWO 1600mm with Pixinslight

1/15/2020

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I've been using my ASI1600MM for last month or so, along with the PixInsight BatchPreProcessing script.



I've read multiple posts to try to understand what should be the proper settings, and at this stage my conclusions are:



1600MM-C



1- All exposures should be longer than 0.2 seconds, as the sensor is not consistent under that.

2- Take light frames as usual, at lowest temperature reasonable (-15C for me these days), with proper gain and offset (gain 200 and offset 50 for me, as I do narrowband), and for me exposures are determined using help from the tables in this post.

3- Take matching dark frames: same length, same gain, same offset, same everything as the lights.

4- Take flat frames: adjust gain as needed so that exposures of over 0.2s are achieved, giving a SGP ADU readout of around 12,000-16,000

5- Take dark flat frames: same gain and offset as the flat frames, and same length. For me, this means one set of dark flats per filter.

6- No bias frames

7- In BPP, put Dark Frames in Darks, Dark Flat frames in Darks, nothing in Bias, Lights in Lights, Flats in Flats. Dark Optimization set to OFF. What I understand this does is:

    a. Create a master dark of same length as light frames

    b. Create a master dark flat of same length as flat frames, for each filter

    c. Flat frames for each filter are calibrated with the master dark flat that corresponds to the length of each filters' flat exposure

    d. Flat frames for each filter are calibrated into a master Flat

    e. Light frames are calibrated with Master Dark (from step a.) and Master Flat (for each filter)

    f.  Light frames are star aligned/registered

    g. Light frames are integrated into a Master Light

8- If needed, manually perform a drizzle or Local Normalization integration

Flats

For flats I am using a technique using the daylight instead of a light panel, tests have proven that the quality is much better then a light panel, and its easy to do.

Cover the telescope, Filter Wheel and camera to avoid light penetration to the sensor.

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