There has been some discussion on the forum recently about stacking data to recover bit depth. Jon posted a wonderful set of math to help folks navigate this topic and I really appreciate his efforts to do so. As always, Jon seems to really help this community (and myself) get our minds wrapped around this crazy hobby of ours.
For those not familiar with the post I am talking about, here it is:
Nevermind our bickering session we had during the latter portions of that thread, I think that is just a product of a few dudes that are very into this hobby and pushing for the best from our fellow comrades.
With that said I produced a graph to help people see how this all comes together.
This data uses three cameras, and walked through the math Jon posted, and plotted it out. The ASI183 is represented twice, at two different gain levels. What is missing from this data are other cameras that people own. I would love for folks to directly send me data to add to this graph. (Regardless of pixel size, noise, etc) The only thing I ask is that if you want to contribute your camera please abide by the following:
- All data plotted was taken with the respective cameras at -20C.
- All data was measured via the PixInsight BasicCCDParameters script. I do not want a conversation about its shortcomings If its errant than all of the data suffers from the same error and thus we are good.
- Do not send me a screenshot and expect me to do all of the math for you, if you want your camera on this list, do it yourself, but do not round the values prior to three points past the decimal. For example, if the value its 1.2581, you can use 1.258.
- Be clear about your gain and offset values (in terms of electrons) and be clear exactly which camera you are using
- Do not submit data to me from uncooled cameras. I have zero interest in adding that to this display.
- Use the ranges I gave in terms of total exposures (the Y axis).
- PM me, do not post in the thread with a bunch of numbers.
Thanks and I hope this, over time, will be very useful to people.
EDIT 4/16: Added the QHY16200A and FLI Proline 16803.
Edited by rockstarbill, 16 April 2018 - 06:11 PM.