天空вℓσи∂ @skyblond@qoto.org

Also found a satellite in the image.

Location: Beijing
Time: 2024 Jun 16 01:24 UTC+8

I don't buy a DSLR camera because I don't want to enable the possibility of me buying all kinds of expensive lens for taking pictures of birds, stars, deep sky objects, etc.

So this is what you need if you just want to get a picture of the night sky. You don't have to buy an expensive DSLR camera to just getting started.

However, an action camera is not a DSLR, and it has a reason for the cheap price compared to a flagship DSLR camera. The lens is fixed, the sensor is small, the features are limited, parameters are not clear (deliberately, by the manufacture).

With all those efforts, I think that's the best of what I can get from this cheap (350 USD) action camera. However, with a proper DSLR camera, I don't mean the flagship one, but any decent one, I think that will be the worst you can get, and with the same effort (I spend a lot of time on calculating the NPF rule, testing the pre-processing software, and the camera itself), I'm sure you can get much better result, even with less effort.

By using the pixel merge feature provided by the hardware (instead of using software when pre-processing), the image quality is much better, aka less noise. Today I have no issues when blowing up the saturation slider, and this time there is no noise. Yesterday I couldn't move the saturation slider at all, since even a slight increase, it shows a bunch of noise and makes the image look terrible.

With 4 pixels merged into 1, I got 3.9 μm per pixel, which allows me to bump up the exposure time to 20s. However, I also tested the ISO settings, which show a better result in ISO 1600, compared to ISO 800. However, thanks to the light pollution, 15S with ISO 800 is on the edge of overexposure. So I didn't stick with higher ISO.

However, yesterday night was cloudy, and I'm too lazy to pick the picture one by one. So I dump them all into the software, and thanks to the cloud, now stars are not pinpoints anymore.

I probably shouldn't read manga all the way to 4AM...

I woke up at 1PM today and my head is super fuzzy...

看完了78话，精彩！日本人是怎么能忍得住月刊的更新频率的？要是我不得天天去作家家门口敲碗（

故事从60多话开始变得有意思了起来

Why will the author think HTML and JS are magic? I thought Haskell and Lisp were.

One last move I'm gonna test is to use the 12MP mode. This action camera used a CMOS that can merge the 4 pixels in to 1, which essentially gives bigger pixel area, giving more time to expose, aka more lights collected.

This is a good one, considering I didn't aim for anything interesting but just a random area of night sky where no trees or buildings are blocking the view. I mean, it's pretty random.

You can actually tell the Lyra (Fig 2) and the Sagitta (Fig 3).

And all of this, is shoot on an action camera, costs only 350 USD. Wow, I'm deeply amazed.

BTW I'm using Sequator for stacking, looks like it can handle the lens aberration pretty good.

Tried to stacking some night sky photos...

It looks like DeepSkyStacker is not capable of handling image produced by non-professional gear, I mean the action camera.

I spend a good amount of time calculating the NPF rule for my Insta360 Ace Pro, and trying to figure out how to do the aberration correction. And the result is... I would say not very ideal, when following the tutorial from here: https://www.youtube.com/watch?v=iuMZG-SyDCU

Maybe I should write my own software to do the aligning and stacking?

----

Also I have a hard time distinguishing if a point is a star or just dust on my monitor...

And it's 3am should probably sleep immediately...

Instead of changing the sound for the alarm, I would prefer a way to change the way to dismiss alarm. Since for now, I can dismiss alarm without actually waking up. That's why today, I was waking up late.

I wouldn't call it a defect or a bug. It's simply people being ignorant and don't care about security. Surely you can call someone writing code as programmer or developer. But still, I highly suggest every developer extend their skill.

Maybe it's because I like computer stuff and I like knowing random stuff. I have a wide range of shallow knowledge about a lot of things. It might take time to build up. But from my personal experience, they are super useful when I need to go deep in a certain route.

I mean, it's not illegal if you just write whatever code is specified by your boss and call it a day. But still, I think one should hold enough responsibility for their work. If you can't do it perfectly, at least give a warning or declaimer to point out the defects.

well... this is more like an irresponsible company doing a project. They don't give a fuck about security and other stuff.

I'm not a security expert, but still, I will consider security and other stuff when I'm working and doing side projects.

researcher accidentally finds 0-day affecting his entire internet servic...
https://youtube.com/watch?v=TFolQUeWoog

@Candinya 好久没用vlc了，我现在用MPV

Family conflicts are very similar to summer storms. They can't be forecasted, pretty strong but pretty short, will cause a lot of damage and happen periodically.

And yes, this evening I had a family conflict and it's fucking bad. It makes me desperately want to move out. The rent in Beijing is too high. Kunming, 2000 km away from Beijing, is a good city for candidate.