KronTalk
Chronos => Chronos User Discussion => Topic started by: prefetch on February 08, 2020, 11:58:26 AM
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i got some lighting and an okay lens.
here's a 1920x1080 1000FPS clip: https://www.youtube.com/watch?v=P5TU0oZnp0Y (https://www.youtube.com/watch?v=P5TU0oZnp0Y)
it's at focal ratio of 1.8 and the focus might be a little off.
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Thanks for uploading!
Focus is a bit off for sure, 1920x1080 should be quite a bit sharper usualy.
If this is at f/1.8, what lens did you use? The Bokeh (Look of the Background Blur) looks to me, that the used Lens is closed down somewhat. So, if it was shot at 1.8, the lens would be an 1.2 or faster then, or your lens is not competely open.
If you used an f/1.8 Maximum Apperture Lens (For Example an Nikon 50mm 1.8 Lens), this Would be like f/2.8 or f/4 or something, just judging from the Look of the image, where you can Clearly see the 7 Blades of the Iris..What Gain Setting and Shutter-Speed/ Shutter angle was this shot on?
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Thanks for posting a clip! So keen to see more from the 2.1 :)
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oops - yes, i just noticed that i have it set to 2.8, not 1.8
the lens is a Nikon AF Nikkor 50mm 1:1.8 D
it was shot with 0db gain.
i'm not sure what you mean by shutter angle, but it the 1000 fps setting sets the exposure to 993.23 usec.
i'll try taking another recording and posting it.
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here's a new clip 1k fps at 1920x1080: https://youtu.be/T0FSl5ORMEM (https://youtu.be/T0FSl5ORMEM)
and here's one at 5k fps at 640x480: https://youtu.be/8xpxutVUQTg (https://youtu.be/8xpxutVUQTg)
i don't think the 2.1 can do any faster than 5k. i believe the 1.4 can do 20k at a low resolution. it's kind of a bummer that the 2.1 can't do that. i'm assuming that's a software limitation.
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here's a new clip 1k fps at 1920x1080: https://youtu.be/T0FSl5ORMEM (https://youtu.be/T0FSl5ORMEM)
and here's one at 5k fps at 640x480: https://youtu.be/8xpxutVUQTg (https://youtu.be/8xpxutVUQTg)
i don't think the 2.1 can do any faster than 5k. i believe the 1.4 can do 20k at a low resolution. it's kind of a bummer that the 2.1 can't do that. i'm assuming that's a software limitation.
Well, you will have to lower the resolution even more, to get higher Framerates (That is just the way highspeedcameras work... Total number of Pixels of a Frame multiplied by time will stay mostly constant, so lower Resolution = Faster). Look at the datasheet! 2.1 can do over 20kfps if you turn down the Resolution enough. The 1.4 can do over 30kfps, that is a Sensor thing though.
Thanks for the other two clips! The new 1000 fps one looks way more sharp!
1000fps at 993,23 µs would mean an shutter angle of about 358°, according to my calculator. Just think of it in terms of an percentage of possible exposure. 1000 fps means, that frames will be captured in 1/1000s = 1 ms = 1000µs intervalls. if the exposure would be 360° now (the theoretical maximum, most time not possible in the real world due to Hardware Limitations), the Image would be exposed all the way through till the camera would start to expose the next image. 180° would be half the time exposure and so on. The Thing about shutter angle is, that if you will change the Framerate, your motion blur will still look similar, no matter what framerate it is shot at, when you play it back at normal speed. (Hope this explained the Shutter angle thing a bit, and didnt cause more confusion...).
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Also, if this is at gain 0 in that new 1000fps clip, you either got a very well lit Tap or the 2.1 is just that good in low light!
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here's a new clip 1k fps at 1920x1080: https://youtu.be/T0FSl5ORMEM (https://youtu.be/T0FSl5ORMEM)
So, i downloaded that clip (For some reason it is not possible to download in 1920x1080, so i got the 1280x720 file of this video) and played around with it a bit. Uploaded as an attachment here to this post.
I corrected the Color, since white-Balance seems a little bit off, also made it a tiny bit brighter and did try to remove the Grain and compression artifacts from youtube video compression as good as possible, while also trying to sharpen it.
The Footage can be graded surprisingly well, especialy given the Fact, that i just got a lower Resolution, highly compressed File to work with! Cant go too crazy with this file though, but i think you can push the Original Raw files very far, if allready this compressed Footage can be worked with so well.
Again, Thanks a lot for uploading.
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here's a new clip 1k fps at 1920x1080: https://youtu.be/T0FSl5ORMEM (https://youtu.be/T0FSl5ORMEM)
...(For some reason it is not possible to download in 1920x1080...
It's not possible to download 1920x1080 on youtube when its uploaded in 60fps. The only way to do this is by directly going through youtubes API to pull the video (can get you banned if done too much). For some reason 1920x1080 60fps is like on a separate server or something. If he uploaded in 30fps you would be able to.
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here's a new clip 1k fps at 1920x1080: https://youtu.be/T0FSl5ORMEM (https://youtu.be/T0FSl5ORMEM)
and here's one at 5k fps at 640x480: https://youtu.be/8xpxutVUQTg (https://youtu.be/8xpxutVUQTg)
i don't think the 2.1 can do any faster than 5k. i believe the 1.4 can do 20k at a low resolution. it's kind of a bummer that the 2.1 can't do that. i'm assuming that's a software limitation.
How much lighting did you use? I assume this is just natural indoor lighting
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How much lighting did you use? I assume this is just natural indoor lighting
Could be, but the Background looks kinda dark... Thats why i thought, the Water may be lit.Also the Light for The Background in the Video does Flicker a bit.
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i used two LED lights (amazon.com/gp/product/B07Y85Z7ML (http://amazon.com/gp/product/B07Y85Z7ML)) when i shot the video.
i assume the flickering is because of some kind of refresh rate on the LED lighting. i'm not sure.
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i used two LED lights (amazon.com/gp/product/B07Y85Z7ML (http://amazon.com/gp/product/B07Y85Z7ML)) when i shot the video.
i assume the flickering is because of some kind of refresh rate on the LED lighting. i'm not sure.
Nah, i dont think the LED´s themself flicker. The Water and The Tap are lit very well, and do not Flicker, but the Background does.Can happen with some Home Lighting. For Example normal Light bulbs of smaller Power tend to do that. This is just the 50 or 60 Hz Flicker of your Mains Power. Its very subtle also, not too distracting.
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yes, that makes sense that the flicker is from the room lights.
btw, the 2.1 will not let me set the resolution lower than 640 x 480 and fps any faster than 5,406. it rejects anything beyond these limits and won't let it be applied to the setting.
the data sheet indicates that it should be able to do 1920 x 8 at 100,000 fps, but this appears as though it's not possible with the current version of the software.
https://www.krontech.ca/wp-content/uploads/2019/04/FM-ENGR-50002-Chronos-2.1-HD-Datasheet-Rv1.pdf (https://www.krontech.ca/wp-content/uploads/2019/04/FM-ENGR-50002-Chronos-2.1-HD-Datasheet-Rv1.pdf)
also, looking at the data sheet, there's no way the battery runtime is an hour long. i can sit and watch the battery drain 1% every 10-15 seconds. seems like it might last 15 minutes tops.
hopefully software updates allow greater than 5,000 fps because the reason i bought it was to do some engineering analysis that will require at least 10,000 fps. low resolution isn't a problem for the analysis, but i need the speed.
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Thanks Kron team,
received my 2.1 today. Love the serial number.
here's a link to a little late afternoon daylight test
https://youtu.be/ytQchDACNkE
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Oh wow that looks amazing!
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yes, that makes sense that the flicker is from the room lights.
btw, the 2.1 will not let me set the resolution lower than 640 x 480 and fps any faster than 5,406. it rejects anything beyond these limits and won't let it be applied to the setting.
the data sheet indicates that it should be able to do 1920 x 8 at 100,000 fps, but this appears as though it's not possible with the current version of the software.
https://www.krontech.ca/wp-content/uploads/2019/04/FM-ENGR-50002-Chronos-2.1-HD-Datasheet-Rv1.pdf (https://www.krontech.ca/wp-content/uploads/2019/04/FM-ENGR-50002-Chronos-2.1-HD-Datasheet-Rv1.pdf)
also, looking at the data sheet, there's no way the battery runtime is an hour long. i can sit and watch the battery drain 1% every 10-15 seconds. seems like it might last 15 minutes tops.
hopefully software updates allow greater than 5,000 fps because the reason i bought it was to do some engineering analysis that will require at least 10,000 fps. low resolution isn't a problem for the analysis, but i need the speed.
I am Not Quite sure about the 100.000 fps, but it should be able to do well over 26kfps, from what i have seen in the Datasheet.
Not sure, what the thing is, that you cant set the Framerate higher/ Resolution lower? Maybe there is presets for that? or its just some other way to lower the Resolution.
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The thing about Batteries is, that they can behave weird sometimes. Just this week i took an Audiorecorder outside in the Cold with an standard Non-Rechargeable AA Battery, and it seemed to drain very, very fast untill it was almost empty. Some Time Later i swiched it back on, and the Display said, it was full Capacity, then it drained Quickly again. Used this same Battery now for about 4 Days (about 1 Hour a day) after that, and it still holds up ok and seems to still have Plenty of power Left in it..Same thing can Happen here with these Chronos-Batteries.
They need to be propperly charged and Discharged to provide the full Capacity of energy they can hold. And Extreme Temperatures are allways a challenge for them...
Also thanks to Photopage for uploading the Clip.The Depth of field is obviously very thin in this one, so Focusing is difficult with a shot like that.Only thing i dont understand, where the blocky artifacts / Compression Artifacts come from? Is that from Exporting in Low quality in your Editing Software (Low Bitrate/ Bad Codec, But there isnt even that much Stuff moving, so it shouldnt be that much of a Problem in this Clip), or the crappy YT Compression?
Its somewhat subtle, but i noticed it the First second i watched it.Otherwise, very Well Graded, and i like the Colors that it Produces A Lot.
Just so much more Pleasing to watch than the majority of the 1.4 Chronos Footage. I dont know what it is, but most 1.4 Chronos footage allways seemed a bit of in terms of color, some People with actual good Skills in Color Correction got it to work, so it looked ok, but most other clips always looked a bit strange to me.
With this Clip from the 2.1 it just looks right in terms of Color. Not over-Saturated, just nice to look at..
I think this Clip could also use a bit of sharpening (The footage seems to be able to take a Lot of Sharpening bevore it looks bad, that is a very good thing! A lot of modern Consumer-Cameras would oversharpen their Footage).
Could you also upload the Clip without any grading on it? Just, if it is noticeable different, if you just did very fine adjustments, it wouldnt make a difference.
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That's just awesome looking footage!!!
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Thanks for sharing the footage! Are you based in the U.S.A?
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I would love to have that 2.1 * ___ *
As soon as there is a European sales office so that customs duties are eliminated, I will get one too!
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I would love to have that 2.1 * ___ *
As soon as there is a European sales office so that customs duties are eliminated, I will get one too!
We're looking into expanding and having offices in other countries, but sadly that won't eliminate the VAT you need to pay. For most countries, the bulk of the import fees are VAT rather than duties, so cameras sold in Europe will need to have VAT added to the price before sale just like pretty much anything else that's sold in Europe.