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Messages - Photopage

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Chronos User Discussion / Re: One line of lighter pixels in saved video.
« on: September 27, 2020, 02:28:39 PM »
I now do lots of Black calibrations when Iím working.  As the camera starts up and slowly gets hotter I Black Cal for every take.  Once the camera is running at a constant temp I do a calibration about once an hour.  Any change of Shutter angle / shutter speed needs a new Black Cal, and any other changes like FPS and sensor size, black cal.

I dont like the exposure slider.  Itís way too easy to change the shutter settings, and looks the same as the playback slider, which I use all the time.  Iíve accidentally changed the shutter dozens of times by mistake.

Hope your line is fixed now?

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: September 11, 2020, 09:36:27 PM »
Had my 2.1 for 12hrs now took it into the garden shots some frames. EF to c mount adapter using canon EF lenses. H264 lut applied in resolve. this camera is the real deal, worth the wait.

https://vimeo.com/457154964

Amazing images!  Good to see more Aussie Chronos users

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Software Dev / Screen Brightness Control
« on: September 09, 2020, 05:08:15 PM »
I have a 2.1 and the screen is amazingly bright. Great for outdoor shooting in sunlight.  But when I'm shooting in the studio I would like an option to control the brightness down to a level that matches the viewing conditions.  Would this be something that a future update could include?
Love the camera, thanks!

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: September 07, 2020, 07:13:35 PM »
Drinks test with 2.1 and Hive Plasma lighting
https://youtu.be/TS7iinpBuqA

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Chronos User Discussion / Re: Extracting still images
« on: June 24, 2020, 02:30:26 AM »
Hi Photopage:

Sorry for the late reply.  Thanks for taking the time to try to verify the exposure.

In looking at the pictures, I am confused.  If each still is one microsecond exposure, why aren't the images much clearer.  In looking at the images, I have no idea what I'm looking at.

Thanks.

Hi rdemyan,
 I was using motion blur to work out the exposure duration.  No motion, no information.  So you are looking at a highly magnified image of a saw blade going at roughly 2000 rpm.  See attached jpeg for wide view.  Also, there was a good discussion about the differences in 2.1 and 1.4 sensors and how they deal with parasitic exposure.  You are right to choose the 1.4 for shorter shutter speeds.

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Chronos User Discussion / Re: Extracting still images
« on: May 02, 2020, 06:54:54 PM »
"The 2.1 can shoot with exposures down to a micro second.  I just tested it."

I've pretty much decided that I am going to buy one of the cameras.  The datasheet for the 2.1 says that the minimum exposure time is 10 microseconds and not 1 microsecond.  Would you please confirm that you were able to get 1 microsecond?

Also, is the fps really limited to 24,046 per the datasheet?  It seems odd for a higher resolution camera and given that the initial announcements for the 2.1 said the camera would be able to shoot 100K fps.

Thanks.


To test the 1 microsecond exposure I shot a 260mm diameter saw blade doing roughly 1800rpm.
To test the timing using household equipment only, I compared the distance between frames at 24000fps with the motion blur of the exposure at 1us.
jpeg of frame sequence attached
I know that this relies on the same piece of kit to both test and measure, but no-one is questioning the frame rates.
Looks good to me.
I also shot at 5000fps and got the same result, but there is no usable sequence at this micro scale, jpeg attached.
 

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: May 01, 2020, 09:24:48 PM »
Mostly 60mm micro Nikkor 2.8.  Some Nikon 50mm 1.4

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: May 01, 2020, 09:13:21 PM »
95% chronos, 5% Nikon.  The timelapse of the cake being decorated was shot on a nikon d4s, everything else was chronos.

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: May 01, 2020, 09:02:14 PM »
some chronos 2.1 fun to promote a fine dining restaurant that's now doing luxury home delivery.  Made primarily for Instagram. @atticamelbourne @lunecroissant @colinpagephoto

https://youtu.be/44Oe9YlGQxM

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Chronos User Discussion / Re: Extracting still images
« on: May 01, 2020, 04:14:23 PM »
Anyone got any ideas about how to measure if the camera is doing what it says?  I think the maths is right, (1/24000)/360 x 8 for an approximate microsecond with an 8 degree shutter at 24000 FPS, but how do you test if that is actually what the camera is doing?
Happy to do the test if anyone has a method that can be with household items.

Exposure seems like the easiest option, but does the sensor have any reciprocity failure at very small exposure times?

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Chronos User Discussion / Re: Extracting still images
« on: April 29, 2020, 07:37:50 AM »
Hi, interesting discussion.  The 2.1 can shoot with exposures down to a micro second.  I just tested it.
Youíll need a lot of light, so using a flash as your light source is a good idea.
In my quick test, I used the highest standard setting, around 24000 frames per second and an 8 degree shutter to get the 1 microsecond exposure.  The camera crops the sensor to achieve very high shutter speeds, so resolution is greatly reduced.  At that speed I get a number of weíll exposed frames from a single flash.
I also tried at full resolution, but had no luck.  Thatís probably because I had no way of triggering the camera to the flash, and at full res the camera only grabs 1000 frames per second, and my little flash was most likely firing at around 1/4000th of a sec.  Iím sure you would get exposures if you tried for more than 5 minutes, or worked out a trigger / delay or used a longer duration flash.
You wonít get a million frames per second video by selecting an exposure of 1 us, but you will get a good 2meg still frame if you can figure out the light source or trigger, and a thousandth of a second later youíll get another still frame.
Sounds like fun

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: March 10, 2020, 03:00:07 PM »
Great result

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« 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

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Chronos User Discussion / Re: Post Chronos 2.1 clips here!
« on: February 13, 2020, 06:03:59 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




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