UA-cam Tip: If you pause the video, you can use the comma (,) and period (.) buttons to move the video backward or forward one frame at a time. This can be used to view the info dumps, or you can check the animations. For example, the animation at 5:08, I am pretty sure that the I got the dots to match with the measured pixels (unless I accidentally plotted by columns instead of by rows)!
Another way of looking to see if astrophotography is "real" is examining the way we get astro photos and how the eye actually sees. For instance, the "Horsehead Nebula" is 1500 light years away and cannot be seen at all with the naked eye. If we could travel to about 10 lightyears from this object, we still would not be able to see it with the naked eye. With film, the long exposure greatly enhances what we see. This is also an effect of stacking digital photos. Pretty much all galaxies and nebula would be far less striking in appearance without the long exposure or stacked images. So while this photography is "real" it does not represent what the eye would see.
Yes, I think you hit the nail on the head! My two previous videos in the series try to explore this. I think the point of those videos is that what we see with our eyes isn't 100% real (so, maybe it isn't the best metric). And this video makes it explicit: "real is a nebulous term." How we define it will determine the conclusion.
That's a great question, and a great idea for a new video. :) I think that with most cameras, it isn't that much of a problem, especially when there is light pollution. In darker skies, it can be a larger % of the total noise, so it can sometimes be better to take longer exposures (i.e., read noise gets added every sub frame basically equally; so longer subs make sense under those conditions). Thanks for the video idea!
UA-cam Tip: If you pause the video, you can use the comma (,) and period (.) buttons to move the video backward or forward one frame at a time. This can be used to view the info dumps, or you can check the animations. For example, the animation at 5:08, I am pretty sure that the I got the dots to match with the measured pixels (unless I accidentally plotted by columns instead of by rows)!
Another way of looking to see if astrophotography is "real" is examining the way we get astro photos and how the eye actually sees. For instance, the "Horsehead Nebula" is 1500 light years away and cannot be seen at all with the naked eye. If we could travel to about 10 lightyears from this object, we still would not be able to see it with the naked eye. With film, the long exposure greatly enhances what we see. This is also an effect of stacking digital photos. Pretty much all galaxies and nebula would be far less striking in appearance without the long exposure or stacked images. So while this photography is "real" it does not represent what the eye would see.
Yes, I think you hit the nail on the head! My two previous videos in the series try to explore this. I think the point of those videos is that what we see with our eyes isn't 100% real (so, maybe it isn't the best metric). And this video makes it explicit: "real is a nebulous term." How we define it will determine the conclusion.
A question I have is, how much does a cameras read noise influence SNR? How many photons in enough to have confidence? (future video topic?)
That's a great question, and a great idea for a new video. :)
I think that with most cameras, it isn't that much of a problem, especially when there is light pollution. In darker skies, it can be a larger % of the total noise, so it can sometimes be better to take longer exposures (i.e., read noise gets added every sub frame basically equally; so longer subs make sense under those conditions). Thanks for the video idea!
Brother why did you not use the Star alignment tool in pixinsight 😭
Another awesome video!!!
Thank you!
🎉
Aww shucks. Better luck next time Doctor Detail. I’m sure you’ll figure out a way to take over the world eventually, you seem like a pretty smart guy.
Thanks! There's always next video to try ;)
Deep Sky Derail
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