Messages

16

Software Dev / Re: Software V0.3 Beta

« on: December 25, 2017, 03:45:53 PM »

I'm trying to reproduce the issue right now but no deal. The camera was cold (10 degrees) at the time I originally had the issue. I was just messing with the camera so I didn't get any footage. I'll try to put it in the garage for a while and let it cool down, and see if it does the same thing when cold.

On another note, is reducing minimum vertical resolution below 96 pixels on the docket for the next update?

17

Software Dev / Re: Software V0.3 Beta

« on: December 24, 2017, 03:43:11 PM »

I'm having a minor issue after the update - when I use very low resolutions, especially 336x96, I get one flashing horizontal brown line near the top of the frame and one flashing blue line near the middle. These show after a black calibration. I'm assuming this has to do with the RAM temperature - I sometimes had the flashing line issue in the past running previous firmware versions but it was always resolved by performing a black calibration. Now black cal doesn't eliminate the lines.

My camera is serial #18 running software version 0.3. I do have an edited resolutions file, I'm not sure if this would cause any issues?

18

Software Dev / Re: Access OS card with Windows PC?

« on: December 24, 2017, 12:55:42 AM »

I can provide some help here David (returning the favor :-)

I input 620x320 by mistake originally, which is invalid. (Normally selecting 620 pixels in-camera rounds off to 624). It did appear in the drop-down menu but I couldn't select it. the frame rate displayed next to it was something ludicrously high like "56...34264" or something to that effect.

I have 512x288, 448x240, 336x192 and 336x96 in my drop-down menu and they all work with software v0.3! My unit is one of the early bird ones. Maybe the bug only appears in some cameras?

I should also mention I really like the improved save speed inV0.3. It's going to really improve battery life for me - much less time spent saving. The next improvement I'm looking forward to is going above 38Kfps. I don't see much interest for it but hopefully there is enough to implement it!

G

19

Software Dev / Re: Access OS card with Windows PC?

« on: December 23, 2017, 10:56:55 PM »

There are two partitions, a FAT32 for boot and an EXT3 for the Linux OS. You need to access the card from a Linux system to see the second.

Thanks David, EXT3 was the keyword I needed! After a quick search I found a program called Paragon ExtFS for Windows which allowed me to access the partition and open the resolution file in Windows 7. Thanks again!

What other company gives customers this level of service? None that I can think of.

Edit: thanks Tretee for the notepad++ link as well, it opens the file with each resolution on its own line rather than notepad, which shows it as a string of numbers.

G

20

Software Dev / Re: Access OS card with Windows PC?

« on: December 23, 2017, 07:57:19 PM »

Tetree - I do see some files but no folders. David told me to look in /opt/camera/resolutions to find the text file in question, however I see no folders. Hidden files and folders are turned on. All I see on the micro SD card is:
boot.cmd
boot.scr
MLO
README.boot.scr
splash.bmp
u-boot.bin
uImage
 
I've installed notepad++ as you recommended but all the files I listed above appear as lines of gibberish. It seems I'm not seeing all there is to see on the card.

Any other ideas?

G

21

Software Dev / Access OS card with Windows PC?

« on: December 23, 2017, 02:29:20 PM »

Hello,

Please forgive what is probably a really dumb question -

I want to edit the drop-down list of resolutions/frame rates on the main record settings screen. I don't have a linux machine available to access the contents of the OS microSD card on the camera, so I'm wondering if any 3rd party applications are available for PC to access and edit this type of file. I don't know what the extension is. I have zero experience with linux.

Thanks,
G

22

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: December 04, 2017, 06:59:40 PM »

Here are more blast waves in slow motion at 8250 and 7400 fps, one hitting a snowman and the other some propped up dry plant stems.

Some of you may be reminded of the artificial forest created in Nevada in the 50s for one of the atomic tests :-)

https://youtu.be/XkPj1M4Jiz0

G

23

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: November 20, 2017, 11:18:00 PM »

Various shots of bullets being fired and striking a variety of things:

https://youtu.be/sKOAGq_nrxY

An explosion at the water's surface 3,400 fps - re-creation of the crossroads-baker atomic test shot ;-)

https://youtu.be/KUTQ8hkxvuk

24

Software Dev / Re: Problems updating

« on: November 17, 2017, 03:33:38 PM »

eSATA is also a no go. Just get an error even when just trying to back up the config files.
Does the camera also see eFAT format??

I had to try a couple of USB sticks when I was trying to back up my calibration before applying the update. It would just say "backup failed" or something to that effect.
In the end the one that worked was a cheapo usb stick, something my wife had gotten for free from a conference with the schedule on it. Disposable-grade. But it worked!

Have you tried a different USB key?

25

Software Dev / Re: Problems updating

« on: November 15, 2017, 06:53:21 PM »

There is no full sized one.  A port.

Directly above the port you are using in your photo is the one labelled "esata" and has the usb logo next to it. It looks more like a sata plug than a USB but it does accept a USB stick!

26

Software Dev / Occasional black screen on startup after software v0.2 update

« on: November 15, 2017, 03:29:43 PM »

Hi David,

This isn't much of a hindrance since it resolves by doing a hard reset, but sometimes, perhaps 10% of the time when I boot the camera up, all I get is a black screen. The power button light will be on but nothing else. Once you release the updated firmware I'll see if the problem is resolved and report back.

G

27

Chronos User Discussion / Re: Chronos 1.4 Footage Thread

« on: November 01, 2017, 11:36:05 PM »

Here's a quick one, a great shot (scientifically speaking - resolution is low) showing a shock wave produced by an explosive target.

As a bonus, the shadow of the shock wave is also visible. As the shock wave moves through the air and compresses that region, the refractive index of the air changes, making it act like a lens. This is what causes this shadow to be visible.
Or something like that.

I often find the joy of filming in high speed is finding out that you've inadvertently captured something after the fact. There's so much to look at in even a short clip. I love it.

https://youtu.be/DuvImcqRGYE

28

Chronos User Discussion / Exploding pumpkins

« on: November 01, 2017, 11:17:10 PM »

In retrospect, I should have placed the camera to the side to avoid having too much light come through the bullet hole. Next time.

https://youtu.be/Krgfc4dAMY4

29

General high-speed discussion / Re: Measuring Speed

« on: October 23, 2017, 12:39:06 AM »

If you need something long a telescoping staff for a laser level could work, can be had relatively cheap and off the shelf from a survey place. The only issue I can see is they're not very wide.

http://www.ebay.ca/itm/2-pcs-of-CST-4M-Metric-Telescoping-Aluminum-Rod-Metric-E-06-804MM-with-Bag-/142216661926?hash=item211cc60ba6:g:-pQAAOSw241YVvGl

30

Chronos User Discussion / Re: Insanely high speed slit scan method?

« on: October 21, 2017, 01:23:26 PM »

There's also a frame rate limit above which the camera becomes export controlled, I believe the number is 200,000fps but I have to check. But the image sensor itself is capable of well above that when running at 1 pixel height.

David

It seems that as of 2011,  cameras capable of >1,000,000fps or <1us exposure AND >125fps were subject to controls. I can't seem to find a more recent version of the document:

http://www.international.gc.ca/controls-controles/about-a_propos/expor/guide-2011.aspx?lang=eng

From the document, on the list of controlled items:

1-6.A.3.a. Instrumentation cameras and specially designed components therefor, as follows:

[...]

4. Electronic framing cameras having a speed exceeding 1,000,000 frames/s;
5. Electronic cameras having all of the following:

    An electronic shutter speed (gating capability) of less than 1 μs per full frame; and
    A read out time allowing a framing rate of more than 125 full frames per second;


On another note... Is the new firmware going to include the black stripes top and bottom for higher frame rates? :-p