Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery! - page 4 - Creative Uses of CHDK - CHDK Forum
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Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!

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Offline fingalo

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #30 on: 01 / December / 2007, 20:36:04 »
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ver 128 is up. I go to bed!
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Offline crunchy_3d

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #31 on: 02 / December / 2007, 03:55:19 »
Hi!

I would like to add that there exist a nice little program which may help you in measuring the shutter speed. The program can be downloaded here:

http://www.3dtv.at/Downloads/Index_en.aspx
(see: Camera Sync Tester 0.1.1)

Direct link is the following:
http://www.3dtv.at/Downloads/synctest011.zip

Unpack the program and run it in "DOS" mode (Start - Run)

write the following:
synctest.exe -x1024 -y768 -r100

where 1024 is screen width, 768 screen hight and 100 refresh rate. Of course - you can change the numbers to suit your monitor size and refresh rates.

How to measure shutter speed? Simply measure number of bright lines at known shutter speed (let's say 1/1000s), calculate time required for 1 line and then measure number of bright lines at some other speed.

I know that you are already using monitor for measuring speed, but the mentioned program displays numbers which helps you in counting lines.

Damir
« Last Edit: 02 / December / 2007, 03:57:43 by crunchy_3d »
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Offline GrAnd

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #32 on: 02 / December / 2007, 04:25:29 »
Quote from: crunchy_3d on 02 / December / 2007, 03:55:19
I would like to add that there exist a nice little program which may help you in measuring the shutter speed.
...

Hmm.. My XP almost died when I had run this program. I hardly managed to kill the process. But I have LCD monitor, maybe that was the cause?
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Offline a710is

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #33 on: 02 / December / 2007, 04:49:07 »
LCD monitors work differently than CRT anyway. they display the whole screen at a time, not lines like those generated by a cathod ray tube.
plus they aren't as flexible in terms of resolution/interpolation and refresh rate. they won't go to 100 Hz even for tests if they're not designed for it.
so this software will only work on CRT
it's not too useful though. I'm still counting the pixels :D
doesn't anybody have a turbo/ turbodiesel car?
« Last Edit: 02 / December / 2007, 04:51:51 by a710is »
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Offline a710is

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #34 on: 02 / December / 2007, 05:14:17 »
the default on Fingalo's build really should be "off". every time I power up the camera with v128 it's set at the 65" shutter override so hopefully Fingalo will change that
and I think that the natural order should be like 1/10000 (or maybe even some lower times added) then 1/8000, 1/6400.... .... 65 s (increasing times instead of decreasing)
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Offline GrAnd

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #35 on: 02 / December / 2007, 05:27:53 »
Quote from: a710is on 02 / December / 2007, 04:49:07
LCD monitors work differently than CRT anyway.

Yeah, I know. I just tried to execute the program to see what it draws. ;)
Some days I wrote the program which draws filled rectangles on 1000Hz to compare the input lag of my new monitor vs an old one:


BTW Why this board does not have the tag [off][/off] (offtopic) ?
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Offline fingalo

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #36 on: 02 / December / 2007, 06:13:23 »
Normally the override would be saved when changed?!
One way is to delete the chdk.cfg-file to clear old settings.
Let me know if this is a general problem.
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Offline a710is

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #37 on: 02 / December / 2007, 06:33:38 »
well lately I'm hardly getting anything saved in the CHDK menus. every time I turn on the camera I have to do it all again. I guess maybe it's a problem in my camera.
but couldn't you set off to be the 1st value? whenever you have time.
and how could we get to edit this cfg file so we wouldn't have to delete it. having to set everything allover again after deleting that file is a bit nasty.
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Offline crunchy_3d

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #38 on: 02 / December / 2007, 08:22:09 »
Quote from: GrAnd on 02 / December / 2007, 05:27:53
Quote from: a710is on 02 / December / 2007, 04:49:07
LCD monitors work differently than CRT anyway.

Sorry, I forgot to mention that the program works correctly on CRT monitors. It's not so easy to find them around, I know. The resolution and refresh rates should be selected according to modes supported by the monitor. I did not have problems with the program. Just press 'ESC' button for terminating.

Time resolution could be less than 1/100000s per line if vertical resolution is above 1000 lines and refresh rate 100Hz. I think that it's more than enough, isn't it?

Damir
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Offline Kalli

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Re: Whoa! ****MAJOR**** High-Speed Shutter-Speed Discovery!
« Reply #39 on: 02 / December / 2007, 08:50:40 »
Quote from: Barney Fife on 02 / December / 2007, 07:47:07
...But that "RAW Parameters" could probably be renamed to "Image Tools", ...

Just load the corresponding english.lng and it should work ok.
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