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Chronos User Discussion / Re: Fan running much faster?
« on: February 19, 2018, 09:47:31 PM »
Likely just your imagination, that battery life seems nominal so I doubt it's consuming more power than normal.
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77
Chronos User Discussion / Re: Fan running much faster?
« on: February 19, 2018, 03:27:26 PM »
No changes to the fan speed control in any of the updates yet. What's the ambient temperature? Did that change significantly since the last time you used it?
78
Chronos User Discussion / Re: Minimum RAM required?
« on: February 14, 2018, 05:27:45 PM »
Don't have any firm ETA on that, but we have additional software resources now focusing on the UI so updates should be coming faster now.
79
General high-speed discussion / Re: driving low pressure sodium lamp without 60Hz flicker
« on: February 11, 2018, 09:53:19 PM »
Another solution may be to simply rectify and filter the AC mains to DC and feed it into the ballast. I would probably use a variac for control, and adjust it so that the lamp is operating at the proper power. Just plugging the circuit into mains directly would likely result in the lamp being overdriven.
80
Software Dev / Re: Horizontal banding
« on: February 11, 2018, 09:15:36 PM »
Partially taping up the fan is an acceptable workaround. Even with the fan completely stopped or blocked up, the camera stays at a safe, albeit uncomfortable-to-hold, temperature.
I believe what is happening here is that the low temperature is causing an offset that's resulting in a black scene clipping to zero, which it shouldn't do. This would cause black cal to not completely remove the horizontal band, since it was all clipped to black when the lens cap was on. I'll look into this, it should be a simple software fix of adjusting the ADC offset slightly higher.
The sensor does have a temperature sensor, so it will be possible to automatically correct for the offset variations with changing temperature once we have time to implement the fix.
I believe what is happening here is that the low temperature is causing an offset that's resulting in a black scene clipping to zero, which it shouldn't do. This would cause black cal to not completely remove the horizontal band, since it was all clipped to black when the lens cap was on. I'll look into this, it should be a simple software fix of adjusting the ADC offset slightly higher.
The sensor does have a temperature sensor, so it will be possible to automatically correct for the offset variations with changing temperature once we have time to implement the fix.
81
Chronos User Discussion / Re: raw recording
« on: February 11, 2018, 02:25:11 PM »
No off the shelf programs support the current "very" raw binary files yet, they need to be converted to something more standard first. We are working on custom utility called raw2dng to do this conversion. I have a working Linux version I can release if interested, but no Windows build yet. The source code is available now if you'd like to take a look or build it yourself.
https://github.com/krontech/chronos-utils
https://github.com/krontech/chronos-utils
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Chronos User Discussion / Re: Minimum RAM required?
« on: February 11, 2018, 02:16:36 PM »
4GB RAM is not supported, 8GB is the minimum. However, if you just want to record a smaller segment, go check out the latest beta software. Under Record Settings -> Record modes, you can set the recording length as short as you want.
Let me know if this does what you want.
Let me know if this does what you want.
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Software Dev / Re: Horizontal banding
« on: February 09, 2018, 12:46:19 PM »Will constant low temperature cause it? I had the camera on continuously on Tuesday, so it got as warm as it could but the ambient temperature was always very low.
If this is going to be an ongoing problem when using the camera outside, I'll have to do a black cal immediately before every shot.
It's possible that constant low temperatures may be beyond what the stock calibration can handle, I will look into this. However, if doing a black cal just before the shot fixes it, the problem is not the calibration, it's just a change in temperature that occurred between the last black cal and the current shot.
84
Software Dev / Re: Horizontal banding
« on: February 09, 2018, 09:46:50 AM »
The amount of banding is effected by temperature. If you black cal the camera, then it warms up or the ambient temperature changes significantly, the banding will reappear. Make sure to black cal after the camera has reached a stable temperature, leave it running for about 20 minutes or so in the environment you'll be using it in before use.
For example, letting it warm up indoors, then taking it outdoors where it's cold will cause this to show up.
For example, letting it warm up indoors, then taking it outdoors where it's cold will cause this to show up.
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Software Dev / Re: Horizontal banding
« on: February 08, 2018, 02:47:03 AM »
Interesting. Was the camera warming up during this time, or was it fully warmed up (at least 20min)?
86
Software Dev / Re: Save frame rate defaulting back to 60fps.
« on: February 07, 2018, 04:49:24 PM »
I'll look into this, it's probably an issue with settings saving given that you restarted the camera.
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Software Dev / Re: Save frame rate defaulting back to 60fps.
« on: February 07, 2018, 01:36:08 PM »
Did you turn off or restart the camera at any point during this session?
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Software Dev / Re: Horizontal banding
« on: February 07, 2018, 01:34:38 PM »
Does either the top or bottom of the band move when you move the shutter slider?
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Software Dev / Re: Horizontal banding
« on: February 06, 2018, 04:26:57 PM »
That looks like the shutter line artifact. I think what happened is you changed the shutter speed and didn't do a black cal. Try again, making sure to do a black cal after any shutter speed change. This isn't such an issue at full horizontal resolution, but at reduced resolution it's important.
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Chronos User Discussion / Re: best saving settings for image quality
« on: February 04, 2018, 12:56:45 PM »
No, the difference is visible in static images. It is quite minor, only really well trained eyes will spot it. There are three main diferences:
As you reduce horizontal resolution, the this quality reduction occurs as you go below each of the following resolutions (applies to software versions up to an indluding v0.2.5)
1280
640
496
416
For example, going from 640 down to 624 reduces the quality slightly, and going from 496 down to 480 reduces it another step. It's really not very noticeable, except at very low resolutions in cases where you don't have sufficient light (which is quite common at those frame rates!)
- Slightly reduced dynamic range (only by about 1dB)
- Very slightly flickery column band line, 640 pixels from the right side of the image (will be corrected once we have dynamic wavetable generation working)
- Horizontal shutter artifact line is more pronounced (corrected by Black cal)
As you reduce horizontal resolution, the this quality reduction occurs as you go below each of the following resolutions (applies to software versions up to an indluding v0.2.5)
1280
640
496
416
For example, going from 640 down to 624 reduces the quality slightly, and going from 496 down to 480 reduces it another step. It's really not very noticeable, except at very low resolutions in cases where you don't have sufficient light (which is quite common at those frame rates!)