CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI - page 8 - Completed and Working Scripts - CHDK Forum

CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI

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Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #70 on: 08 / July / 2014, 14:30:03 »
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fabri22,

"You don't need manual controls on your camera or CHDKplus for exposure bracketing."  Thanks for the clarification.

Do you need manual controls for focus bracketing? 

Read "Subj. Dist. Bracket Value ​

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #71 on: 08 / July / 2014, 14:39:23 »
Would appreciate comments concerning "One more bonus: Using the camera's Custom Self-Timer's counted shots with CHDK's Continuous Bracketing you don't even need a script to take single-event HDR or Focus Bracketing shots. You can manually initiate a counted bracketing sequence this way with each shutter press. No need to even run a script, the camera + CHDK will do it all for you. The flexibility of knowing this method becomes limitless."
http://chdk.wikia.com/wiki/UBASIC/Scripts:_Make_ANY_Single-Shot_Intervalometer_into_an_HDR-Bracketing_Script

Is this possible with the IXUS 132/ELPH 115?

If yes would you please give detailed instructions how to do it.

Thanks

Gene

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #72 on: 08 / July / 2014, 15:45:24 »
Do you need manual controls for focus bracketing? 

Read "Subj. Dist. Bracket Value ​
As far i know (just a bit  :) ) you do not  even need manual controls for focus bracketing.
One of the main features of CHDK is that it can override focus and exposure parameters on full auto cameras. That's why i love it.
But CHDK doesn't handle very well focus override on some new cameras, like mine.
So you have just to try it on your camera via the CHDK "Enhanced Photo Operations", then, if it works, via scripts.
BTW CHDK 1.3 is safe and better  ;)

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #73 on: 12 / July / 2014, 12:51:23 »
Okay, finally got the ND filter thing under control in Tv & Av priority modes. Updated link below.

link > CHDKplus.lua beta 2.1
Ported :   A1200    SD940   G10    Powershot N    G16


Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #74 on: 12 / July / 2014, 19:05:32 »
Okay, finally got the ND filter thing under control in Tv & Av priority modes. Updated link below.

link > CHDKplus.lua beta 2.1

Thanks again WW.
Right now i can't test it in bright day light (different time zone). ASAP i'll do.
Just noticed that starting the script in M mode all values aren't on default, despite chosen settings.

Question: Does CHDKplus ovverride the canon EV +/- settings? Usually i set my camera to - 1/3 EV.

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #75 on: 12 / July / 2014, 19:19:15 »
Right now i can't test it in bright day light (different time zone). ASAP i'll do.
Thanks.  I did all of the testing over the last week shooting straight into the CCFL bulb on my desk lamp. Gave the ND filter quite a workout.


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Just noticed that starting the script in M mode all values aren't on default, despite chosen settings.
Good catch - the initial values are now set by a quick exposure reading it does when the script starts.  Would it be better to use the default @param values ?

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Question: Does CHDKplus ovverride the canon EV +/- settings? Usually i set my camera to - 1/3 EV.
Yes - in everything but P mode.
Ported :   A1200    SD940   G10    Powershot N    G16

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #76 on: 12 / July / 2014, 19:43:02 »
Thanks.  I did all of the testing over the last week shooting straight into the CCFL bulb on my desk lamp. Gave the ND filter quite a workout.
Eh, eh  :) Very appreciated work. I did notice how much your script has changed.
It deserves to be the next CHDK 1.4 graphical main interface.

I would prefer to test it in daylight to avoid false reports

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...Would it be better to use the default @param values ?
Especially on M mode it seems to me more logic and useful. Just my 2 cents opinion.

EDIT
My bad english! It's better to write "usual" than "useful" ...
« Last Edit: 12 / July / 2014, 20:18:30 by fabri22 »

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #77 on: 13 / July / 2014, 05:43:34 »
Test Report

Daylight. Same scene. Lens on wide angle.
(default @param: Max Tv = 1/10000 - Default and min Av = 2,8 (max = 16) - Sv Default & Min=100 (max1/2 = 400/800))

P mode= exposure is OK
Sv mode= overexposed for about 1 stop (less than previous CHDK+ version). Now i can get higher Tv values but the 1/2000 max limit of my cheap camera, despite default @param: Max Tv = 1/10000, isn't enough in bright light. The 1/2000 limit isn't overridden and the ND filter isn't engaged.
Tv mode= as above
M mode= when switching to M mode after Sv or Tv (and leaving same Tv and ISO values) i get an underexposed (1-2 stops) picture with Av value setted to highest. ND filter engaged ?
I also noticed this strange behaviour:
-when switching to Sv mode after P mode the displayed Av value is 8.3 (checking exposure with half_shoot). After shooting becomes 2.9 and the image is overexposed, as said.
-the highest Av value displayed in M mode (lens on wide angle) is 8.4   ???

... it seems a sort of sudoku :)


Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #78 on: 13 / July / 2014, 10:26:52 »
Sv mode= overexposed for about 1 stop (less than previous CHDK+ version). Now i can get higher Tv values but the 1/2000 max limit of my cheap camera, despite default @param: Max Tv = 1/10000, isn't enough in bright light. The 1/2000 limit isn't overridden and the ND filter isn't engaged.
Tv mode= as above
I think this is pretty much normal and what you should expect.  The script does not know (and can't tell) how high the shutter speed on your camera will go.  So if you ask for 1/10000 it will set everything up assuming it will get 1/10000.  Naturally,  the images end up overexposed when the picture is taken as the real shutter speed is quite a bit slower.   

You probably want to set TvMax to 1/2000


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M mode= when switching to M mode after Sv or Tv (and leaving same Tv and ISO values) i get an underexposed (1-2 stops) picture with Av value setted to highest. ND filter engaged ?
Again, if the Av setting is not achievable in the camera,  the exposure will be wrong.

Quote
-when switching to Sv mode after P mode the displayed Av value is 8.3 (checking exposure with half_shoot). After shooting becomes 2.9 and the image is overexposed, as said.
I'll look at it but no promises. Mode switching is touchy.  Did you notice you can press the Func/Set button and get the same thing as a "half press" (but without the occasional accidental "full press")
Ported :   A1200    SD940   G10    Powershot N    G16

Re: CHDKplus.lua : adding M, Tv, Av, ISO+ exposure modes with a GUI
« Reply #79 on: 13 / July / 2014, 14:44:20 »
You probably want to set TvMax to 1/2000
That value was the starting point for all my tests. Then, noticing the overexp., setted it progressively higher as you suggested in a previous post.
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Again, if the Av setting is not achievable in the camera,  the exposure will be wrong.
I know, a FIAT 500 will never be a Ferrari  :) This camera hasn't an iris and its Av value are like a trick.
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I'll look at it but no promises. Mode switching is touchy.  Did you notice you can press the Func/Set button and get the same thing as a "half press" (but without the occasional accidental "full press")
Never mind. No claims here. Mine was just a "test report".
Cause my total lack of knowledge in scripting my only contributions here can be test reports :)

Knowing about the Func/Set button, but it is so small and flat that i prefer the half-press. DSLR old habits (very old habits)  :)

 

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