![]() ![]() It shows the field of FR Cet, a 6th mag variable of uncertain type, and non-transformed V mag photometry of the var and the check star. The attached PowerPoint is somewhat complicated. See attached graphs of the camera's stated performance from the official manual. Curiously and enigmatically, in both unbinned and binned 2x2 mode, the sensor saturates at 65,504 counts per pixel, as seen after taking a series of flats at various exposures for linearity testing, and AstroimageJ to analyse the FITS images. The ASI 1600MM software, in RAW16 mode, multiplies the actual counts by 16 to give the numbers you see. For 12 bit ADC, the maximum count per pixel should be 4096. ![]() Note that the line profiles in the attached PowerPoint (which I'll explain) show maximum counts above 60,000. The range of gain settings is from about 0.2 electrons/ADU to 5 electrons/ADU. My understanding (and I am not a CMOS expert, merely a user) is that binning in this camera (and at least some other CMOS cameras) is done with software after the pixels are read out. It allows binning, and yes, various gain settings can be used, both with binned and unbinned images. My experience is limited to the ZWO ASI1600MM cooled monochromatic CMOS camera. This post is a response to some of the quetions posed in that document. ![]() Please see the document attached to the first post in this forum. But if you informed CMOS photometrists will use this forum to gather them together a guide might emerge. I know these topics have been addressed, piece-meal. How about my C11 edge at 1950mm FL? Again, related to #1. For example, I plan on using the 183 with an 80mm refractor for bright variables. Matching cameras to OTAs in the age of CMOS cameras with tiny pixels (for those who cannot now afford Keplers and await less expensive cameras with larger pixels). (From what I can see, off-camera binning is fine, but how much?)ģ. The effects of off-camera binning and its relationship to #1. How do I achieve the greatest dynamic range with a 12-bit camera?Ģ. I would urge all to stick to this goal, it’s easy to get diverted.Īmong topics I am interested in (there must be others).ġ. My hope: Discussion of general principles of CMOS photometry stated in such a manner that clueless people like me can successfully obtain excellent photometry with these cameras. I have been inspired and am selling some stuff off so that I can get a CMOS mono (an ASI 183 Pro cooled) and join the crowd as we march towards the CMOS universe of photometry. My thanks! This it the right approach to getting all the thoughts about CMOS cameras for photometry in one place under a thread title that attracts attention. ![]()
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