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Having had to move to an apartment where I could not use my CPC 1100, I decided that I have to see what I could do with my NexStar SLT 102 (alt-az achromatic 102mm f6.47 refractor). Setting up on my narrow balcony was challenging and the altitude bearing was so loose that it almost moved from the weight of the Canon 700D. I could not see M31 in the estimated 3.5 magnitude sky so I did a two star alignment and used the live-view to focus on a bright star. I then took a 15 second exposure after slewing to M31 which allowed me to see that I had it in the field of view. After a few more 15 second exposures and playing with the motion controls I managed to get it centered. The resulting picture is from 39 subs of 30 seconds at ISO 1600, 9 flats. The images were stacked and stretched with Siril and then I played with the curves on Gimp, cropped and scaled. Not too unhappy.
When talking 32-bit files I normally feels that I'm safe with big margin to not clip any information in my astro image files when workning with them. But is it really so?
After some discussing I feel, why not try to make a Bit Resolution Calculator?
Here is my new Bit Resolution Calculator:
For sure there will be some mistakes in it. I correct it when I found something. The calculations are also simplified.
I'm a little bit surprised over the result, but still in the safe area when not doing something extrem.
Note this is a theoretical simulation and in real life there are a lot of noise that mask the rounding errors. But still interesting to test what happens in different situations.
By Ben the Ignorant
I made a lot of eclipse shots that turned out too dark because my Samsung phone camera is not sensitive enough (400 ISO), but treating these shots as deep sky images, stacking them and doing the processing magic, is it possible to make a few presentable views?
If someone is willing to try - no need to lose sleep over it - I'm posting the images by groups. Each group contains pics made seconds or tens of seconds from each other, not sure if the slight differences will make processing too hard. They were made with a Celestron 5 and an Explore 24/68 eyepiece. Focus seems to be accurate.
Here is a project I have thought about over many years. What can I do with all scientific data that are out there?
I tested this already 15 years ago with the POSS-I data from Mount Palomar observatory with good results.
Now I'm just practising this how to handle the data and get something out of it. One easy task is just to make pictures from the data and compare it with my own photos. Just to get an idea how much worse my photos are compare to the telescopes at Mount Palomar.
Here you can see how I have processed the first two Messier objects, M1 and M13:
Even more exiting is if I'm in the future can do some science with it.
I have many cloudy nights so I'm desperate!