Author Topic: Post Chronos 2.1 clips here!  (Read 4467 times)

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #15 on: February 13, 2020, 07:03:41 AM »
I've never heard of dB gain when talking about video recording, what does this mean exactly?
Decibel or also known as dB is an logarithmic unit. Look it up, if you need more info about it. As far as i am aware, 2 dB more would Double your exposure.
Since the Native (Base-) ISO äquivalent is ISO 500 on the Chronos 2.1, 24 dB Gain should be around 12000 ISO äquivalent, if i didnt get something wrong here.
Will have to do an Side-By side Comparison with an other Camera, to be able to say this for sure, but i think that should be about right.

marcus

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Re: Post Chronos 2.1 clips here!
« Reply #16 on: February 13, 2020, 07:43:30 AM »
I've never heard of dB gain when talking about video recording, what does this mean exactly?
Decibel or also known as dB is an logarithmic unit. Look it up, if you need more info about it. As far as i am aware, 2 dB more would Double your exposure.
Since the Native (Base-) ISO äquivalent is ISO 500 on the Chronos 2.1, 24 dB Gain should be around 12000 ISO äquivalent, if i didnt get something wrong here.
Will have to do an Side-By side Comparison with an other Camera, to be able to say this for sure, but i think that should be about right.


Ah I see yeah I noticed the iso change.

tesla500

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Re: Post Chronos 2.1 clips here!
« Reply #17 on: February 13, 2020, 10:48:20 AM »
I've never heard of dB gain when talking about video recording, what does this mean exactly?

dB is decebel, a way to measure two relative signal strengths. In this case, 6dB of gain is equivalent to 1 stop, or a doubling of sensitivity. So 24db is four doublings, or 16x gain.


Thanks!I dont know what is the Max Setting, but 24dB Still looks more than ok!Looking great.

I find that 24dB gain on the 2.1 is about the same apparent noise as 0dB gain on the 1.4, the new sensor is really phenomenal with respect to noise!
« Last Edit: February 13, 2020, 10:50:53 AM by tesla500 »

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #18 on: February 13, 2020, 10:51:05 AM »
I've never heard of dB gain when talking about video recording, what does this mean exactly?

dB is decebel, a way to measure two relative signal strengths. In this case, 6dB of gain is equivalent to 1 stop, or a doubling of sensitivity. So 24db is four doublings, or 16x gain.
So, 24dB would be 8000 ISO equivalent?

skronstein

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Re: Post Chronos 2.1 clips here!
« Reply #19 on: February 13, 2020, 11:42:48 AM »
Gain test, just increased the gain as the sun was getting lower, leaving FPS, shutter angle and lens aperture on the same(ish) settings.

https://youtu.be/e7yymUQaXjw
Thanks!I dont know what is the Max Setting, but 24dB Still looks more than ok!Looking great.


I've never heard of dB gain when talking about video recording, what does this mean exactly?

They're talking about the analog gain, which is measured in db.  Increasing it increases the brightness of the image, but also makes it more noisy/grainy.

Photopage

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Re: Post Chronos 2.1 clips here!
« Reply #20 on: February 14, 2020, 01:05:47 AM »
720p at 2000fps on Chronos 2.1 test
scaled up (automatically) in DaVinci Resolve

https://youtu.be/PKZ-PsBxJpo

and for anyone who's seen enough insects, these little guys eat em...back at 1000fps
https://youtu.be/4jxneiMJ5gI

marcus

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Re: Post Chronos 2.1 clips here!
« Reply #21 on: February 14, 2020, 01:47:03 AM »
720p at 2000fps on Chronos 2.1 test
scaled up (automatically) in DaVinci Resolve

https://youtu.be/PKZ-PsBxJpo

and for anyone who's seen enough insects, these little guys eat em...back at 1000fps
https://youtu.be/4jxneiMJ5gI

Wow the 2,000 fps shot might be the most impressive yet. Thanks for scratching my itch for more Chronos 2.1 clips!

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #22 on: February 14, 2020, 05:44:07 AM »
720p at 2000fps on Chronos 2.1 test
scaled up (automatically) in DaVinci Resolve

https://youtu.be/PKZ-PsBxJpo

and for anyone who's seen enough insects, these little guys eat em...back at 1000fps
https://youtu.be/4jxneiMJ5gI
Wow, landing looks like quite the Struggle at this speed. very well shot clips you got there!

JamesB

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Re: Post Chronos 2.1 clips here!
« Reply #23 on: February 14, 2020, 08:47:26 AM »
I can see column banding becomes much more visible and still apparent at 0dB. My guess is that more calibration will help with that like it did on the 1.4

marcus

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Re: Post Chronos 2.1 clips here!
« Reply #24 on: February 17, 2020, 12:08:02 AM »
Saw this on YouTube by Scott Aichner: (Sprinkler test at 1000fps 2142fps 3385fps 5406fps)
 https://www.youtube.com/watch?v=D1pG3Ol-8zo

clkdiv

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Re: Post Chronos 2.1 clips here!
« Reply #25 on: February 17, 2020, 01:29:33 AM »
Ah, it`s good to know, that bandings and artefacts and lines in the image seem to be present at all 2.1 cameras, especially when not at 1920x1080... Thought my camera has a problem.

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #26 on: February 17, 2020, 05:45:35 AM »
Saw this on YouTube by Scott Aichner: (Sprinkler test at 1000fps 2142fps 3385fps 5406fps)
 https://www.youtube.com/watch?v=D1pG3Ol-8zo
Very nice Video!Just in the 3k and 5,4k fps shots its a bit much chromatic abberation from the Lens for my taste, or the Camera does something funky in Debayering (That was an problem with the 1.4 initialy also.).

marcus

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Re: Post Chronos 2.1 clips here!
« Reply #27 on: February 17, 2020, 05:58:12 AM »
Saw this on YouTube by Scott Aichner: (Sprinkler test at 1000fps 2142fps 3385fps 5406fps)
 https://www.youtube.com/watch?v=D1pG3Ol-8zo
Very nice Video!Just in the 3k and 5,4k fps shots its a bit much chromatic abberation from the Lens for my taste, or the Camera does something funky in Debayering (That was an problem with the 1.4 initialy also.).

Was that later fixed through software or a hardware change?

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #28 on: February 17, 2020, 06:02:01 AM »
Saw this on YouTube by Scott Aichner: (Sprinkler test at 1000fps 2142fps 3385fps 5406fps)
 https://www.youtube.com/watch?v=D1pG3Ol-8zo
Very nice Video!Just in the 3k and 5,4k fps shots its a bit much chromatic abberation from the Lens for my taste, or the Camera does something funky in Debayering (That was an problem with the 1.4 initialy also.).

Was that later fixed through software or a hardware change?
That was fixed by a change of the Default Debayering algorithm in Firmware.If you use Older Firmware with the 1.4 and shoot a scene like this, it still looks very bad. Lots of very colorfull pixels everywhere they shouldnt be....Thats because for very small highlights some Debayering algorithms just assume that this very bright (In reality white) pixel would actually be the Color of the Pixel, and not white.

Nikon1

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Re: Post Chronos 2.1 clips here!
« Reply #29 on: February 17, 2020, 06:07:43 AM »
http://forum.krontech.ca/index.php?topic=244.msg2013#msg2013....     .So i found the thread about this again. Read from Reply #31 for this.I also did an more in detail-Explaination there allready, if interrested.