Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!* - page 2 - Completed and Working Scripts - CHDK Forum

Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*

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Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #10 on: 17 / May / 2013, 06:22:34 »
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So with cameras mounted vertically, the FOV is very approximately 50 degrees.
There seems to be 10 cameras in the main row to cover 360 degrees.
How are the other 14 allocated ?

Have you tried time-lapse ?

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #11 on: 17 / May / 2013, 08:51:21 »
i'm using the one press mode
If you are interested,  I'll put together a little script that you can have "autostart" when the cameras power up.   

Some simple combination of short presses on your remote switch should do it.  One pulse resets to defaults, two increases shutter speed, three for decreases speed.  You'd use a longer press & hold to focus with the shot taken on release.    It will use the Lua drawing module to put some sort of LARGE indication on the LCD of each camera showing what is happening for an easy visual check.  I'll think about it a bit more today.

Do you have a sense of how precisely sync'd the shutter releases have to be?   Are you currently using the USB remote "Sync" function?
« Last Edit: 17 / May / 2013, 08:54:27 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #12 on: 18 / May / 2013, 18:54:23 »
Hi David.
That sounds ideal. Thanks for your interest! I currently use the sync delay as it gives the cameras time to set themselves up.
I use manual focus set to the hyperfocal point. So, currently I activate cameras and "set" them with a held voltage of 4.5v then they fire at the release of that voltage. I am using this to shoot people in crowds, waves on Bondi beach and I am working on a cloud series. The cameras are arranged in 3 groups of 8. 3 down (nadir) three out and three up (zenith).
Cheers, Hamish.

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #13 on: 18 / May / 2013, 19:46:31 »
Hi David. That sounds ideal. Thanks for your interest!
Are you confusing me with microfunguy?

Quote
I currently use the sync delay as it gives the cameras time to set themselves up.
I use manual focus set to the hyperfocal point. So, currently I activate cameras and "set" them with a held voltage of 4.5v then they fire at the release of that voltage.
I'm confused about this explanation.  Are you actually using the USB remote sync & sync delay functions?  If so,  its not in a manner that they were intended for reading your description.  What sync delay setting are you using ?


Ported :   A1200    SD940   G10    Powershot N    G16


Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #14 on: 20 / May / 2013, 01:03:34 »
yes, I had the names confused.
I have remote enabled, One push, and Control Mode as Normal. I enable sync and sync delay set to 100ms

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #15 on: 20 / May / 2013, 09:41:21 »
I have remote enabled, One push, and Control Mode as Normal. I enable sync and sync delay set to 100ms
With One Push without sync selected,  applying voltage to the USB port does the equivalent of a "half press"  (i.e. set focus & exposure).  When you remove the 5V then you get the "full press" (i.e. shoot).

Using One Press with sync enabled does a complete "half press" and then "full press" when you apply the voltage.  The sync function then traps the shooting sequence right before the shutter actually releases.  When you remove the 5V (or after a short timeout) the shutter is actually released.  Doing this minimizes the difference in release time between multiple cameras by removing as much variability in response time as possible.

The sync delay function probably does not do quite what you are expecting.  It simply adds a fixed delay time AFTER the 5V is released.  Everything in the camera is set & locked at that point - the delay does not change anything or give the camera any extra time to "settle".   Sync delay was implemented to allow a somewhat crude calibration between different cameras as they tend (on average) to have slightly different response times past the "sync wait" point.

In any case, I guess I need to assume the sync function is needed from the perspective of converting what you do to a script.
Ported :   A1200    SD940   G10    Powershot N    G16

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #16 on: 20 / May / 2013, 19:59:37 »
hey Waterwingz thanks for that clarification. Yes, the extra sync delay is redundant in this situation. I will uncheck it. It will also give me a slightly more immediate shooting result. (which is good!)

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #17 on: 23 / May / 2013, 22:23:04 »
Is there any way that I could interact with this script with a remote? I have a rig of 24x chdk cameras (yes, 24!) that I fire with a radio remote. At this stage to change the shutter speed I have to do it manually on all 24x cameras. Any thoughts?
Okay ... the attached script works and does what you want.  But its technically a "proof of concept".  Before I spent any more time on it I'd like to know what you think about the general concept of using the remote button this way?

Try the script out on one camera first?  You can leave the USB remote parameter settings at their default ( Enable Remote [off],  Switch Type [none], Control Type [none], Enable Sync [off] ).

When you try the script,  a short on/off pulse on the USB remote switch will reset the shutter speed to 1/60 sec.  If you push the switch twice,  the shutter speed increases.  If you push it three times, it decreases.  Press just once at any time resets to 1/60.   The size of the increase is a function of the setting in the parameter values (we can play with how big a step to take later).

If you hold the USB switch down for 1/2 second,  the camera will do a "half press" and wait for the release of the switch to do a "full press" and fire the shutter. 

As written,  the sync will be on the order of a few hundred milliseconds.   We can play later with having the camera immediately go to a full press status so that the USB sync function works when the remote button is released.  This will blank the display and it times out after 60 seconds (if I recall correctly) so you can't hold the button too long waiting for the exact moment to take the shot.

We could also introduce a "two press" mode.  That way you hold the button for more than 1/2 second to "half press" - setting focus and exposure lock at that point. If you release the button and quickly press again the shot will be taken (with precision sync).  If you simply release the button then the sequence reset with no shot.

The shutter speed adjust currently does not recalculate the required ISO or Av value to rebalance the exposure - I'll fix that later.

Pressing the MENU key while the script is running will stop things in a graceful manner ( return to playback mode and disable the USB remote).

And obviously  in your final application you would want to set the script up to "autostart" when the camera powers on.  The script will switch into shooting mode on its own when started so you can start the camera in playback or shooting mode.


« Last Edit: 23 / May / 2013, 22:33:20 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16


Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #18 on: 24 / May / 2013, 00:55:31 »
Hey waterwingz.
That is AWESOME! I will download it now and start experimenting and let you know results.

Re: Shutter Speed w/Av, Fully Adjustable (LUA) *UPDATED!*
« Reply #19 on: 27 / August / 2013, 14:03:26 »
Okay ... the attached script works and does what you want.  But its technically a "proof of concept".  Before I spent any more time on it I'd like to know what you think about the general concept of using the remote button this way?

Hi waterwingz, I haven't installed Lua yet [or even got a camera] - if you get a chance sometime could you upload the script as a text-file  :-[ ?

oops - i just changed the extension to ".txt" - so forget the above...
« Last Edit: 27 / August / 2013, 14:06:24 by andrew.stephens.754365 »

 

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