KAP & UAV Exposure Control Intervalometer Script

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #40 on: 02 / December / 2013, 10:26:28 »
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So first I try the values you suggest me…. I put camera outside my window to taking photo to bright an dark areas:
Can you enable logging and repeat this test?  Use the last parameter in the script menu that says Logging and set it to Both.

Rerun your test and then attach the resulting log file from your SD card (  KAP.log ) to a response here?
Ported :   A1200    SD940   G10    Powershot N    G16

Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #41 on: 03 / December / 2013, 09:04:44 »
Hi Like you told me yesterday, here is the KAP.log file....

Is it corect???

Milobg

Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #42 on: 03 / December / 2013, 09:18:22 »
Hi Like you told me yesterday, here is the KAP.log file....
Thanks.  Only the last seven shots in the log are setup as you described in your previous posts.    The only shot there not at 1/1250 is IMG_7351.JPG.   It's shooting at 1/800 because the ISO is maxed out at 1600.  The script seems to be performing exactly as designed.

Ported :   A1200    SD940   G10    Powershot N    G16

Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #43 on: 03 / December / 2013, 10:12:01 »
ok I understand... script works well,

now if I want to lock exposure with your script...
What do you suggest to me??

Are these the right values??

    Av Mode :     both
    Target Tv :    1/1250
    Tv Max :       1/1250
    Lowest Av :   2.8
    Target Av :    2.8
    Highest Av :   2.8
    ISO Min :       100
    ISO Max1 :     100
    ISO Max2 :     100

Let me know, if you can....

thank milobg


Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #44 on: 03 / December / 2013, 10:17:50 »
now if I want to lock exposure with your script...
What do you suggest to me??
To get the correct exposure, the script will lower the shutter speed once the ISO is at maximum and the f-stop is fully opened.  Otherwise you will have an underexposed picture. You could try setting ISO Max2 to 3200 to help with this.   

Otherwise, the script will need to be modified or you will need a different script. 
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline Wreck

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #45 on: 07 / December / 2013, 05:07:44 »
Thanks for creating this script Waterwingz.
 
I've just used it for the first time on an sd960is. I have the target shutter speed set to 1/1600, and most images are being shot correctly at that speed, however I've come across a couple which were shot at a lower shutter speed and iso, and are blurry because of it.

In my kap.log for some of those files, this is the output:
2013Dec06 15:02:52 26) IMG_1022.JPG
2013Dec06 15:02:52  meter : Tv:1/640 Av:2.8 Sv:80 827:827
2013Dec06 15:02:52  actual: Tv:1/1600 Av:- Sv:160
2013Dec06 15:02:59 27) IMG_1023.JPG
2013Dec06 15:02:59  meter : Tv:1/320 Av:5.6 Sv:80 910:910
2013Dec06 15:02:59  actual: Tv:1/1600 Av:- Sv:400
2013Dec06 15:02:59          AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:07 28) IMG_1024.JPG
2013Dec06 15:03:07  meter : Tv:1/125 Av:5.6 Sv:n/a 838:838
2013Dec06 15:03:07  actual: Tv:1/1600 Av:- Sv:640
2013Dec06 15:03:07          AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:13 29) IMG_1025.JPG
2013Dec06 15:03:14  meter : Tv:1/500 Av:2.8 Sv:80 780:780
2013Dec06 15:03:14  actual: Tv:1/1600 Av:- Sv:250
2013Dec06 15:03:14          AvMin:2.8 NDF:none foc:infinity

When I look at the exif for these files, they don't match up to the log:
IMG_1022.JPG is 1/400, f2.8, iso 50.
IMG_1023.JPG is 1/200, f2.8, iso 50
IMG_1024.JPG is 1/1600 iso 640 (as it should be)
IMG_1025.JPG is 1/320, f2.8, iso 50.

Any idea what could be going on?




Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #46 on: 07 / December / 2013, 11:07:51 »
I have the target shutter speed set to 1/1600, and most images are being shot correctly at that speed, however I've come across a couple which were shot at a lower shutter speed and iso, and are blurry because of it.
This is most curious.   Would you say the exposure was correct (i.e. not too dark or too bright) even though the shutter speed was not what you required?

Thanks for posting the log entries.  I color coded a couple of things that pop out right away and commented below.
Quote
In my kap.log for some of those files, this is the output:
2013Dec06 15:02:52 26) IMG_1022.JPG
2013Dec06 15:02:52  meter : Tv:1/640 Av:2.8 Sv:80 827:827
2013Dec06 15:02:52  actual: Tv:1/1600 Av:- Sv:160
2013Dec06 15:02:59 27) IMG_1023.JPG
2013Dec06 15:02:59  meter : Tv:1/320 Av:5.6 Sv:80 910:910
2013Dec06 15:02:59  actual: Tv:1/1600 Av:- Sv:400
2013Dec06 15:02:59          AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:07 28) IMG_1024.JPG
2013Dec06 15:03:07  meter : Tv:1/125 Av:5.6 Sv:n/a 838:838
2013Dec06 15:03:07  actual: Tv:1/1600 Av:- Sv:640
2013Dec06 15:03:07          AvMin:2.8 NDF:none foc:infinity
2013Dec06 15:03:13 29) IMG_1025.JPG
2013Dec06 15:03:14  meter : Tv:1/500 Av:2.8 Sv:80 780:780
2013Dec06 15:03:14  actual: Tv:1/1600 Av:- Sv:250
2013Dec06 15:03:14          AvMin:2.8 NDF:none foc:infinity
First of all,  the script did try to take every shot at 1/1600.  You can see that in the log lines that start with the word "actual".

Secondly,  the SD960 has a fixed aperture.  Yet the camera is trying to use  f2.8 for some shots and  f5.6 for other shots.  One of two things must be happening here.  Either the zoom position is changing or the camera's Neutral Density filter is being engaged by the Canon firmware.  Are you changing the zoom setting some how between shots?  If not, it must be the ND filter, and that will cause unwanted exposure variations.  (Notice that the Canon firmware is only trying to use the f5.6 setting in brighter scenes). Set the AV Mode in the script parameters to "NdFlter" and the script will manage that for you.   (Its not clear how this would cause the shutter override not to work though .. )

Finally, when taking image IMG_1024.JPG, the camera's light meter system tried to select an ISO setting below the range expected by the script.  That's quite curious but should not have caused any problems.

Quote
When I look at the exif for these files, they don't match up to the log:
IMG_1022.JPG is 1/400, f2.8, iso 50.
IMG_1023.JPG is 1/200, f2.8, iso 50
IMG_1024.JPG is 1/1600 iso 640 (as it should be)
IMG_1025.JPG is 1/320, f2.8, iso 50.
Do the exif values for other images match the log entries made by the script?  ( Other than ISO80 being reported as ISO50 ).

tl;dr :  try setting the AV Mode in the script parameters to "NdFlter"
« Last Edit: 07 / December / 2013, 11:10:13 by waterwingz »
Ported :   A1200    SD940   G10    Powershot N    G16

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Offline Wreck

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #47 on: 07 / December / 2013, 16:09:07 »
Yeah the exposure on those images which had the low shutter speed and iso was more or less correct, so it must be that the ND filter was engaging. It seems that the images where this happened generally had more of a bright feature in the frame than others that were more of a uniform tone.

I've just had a more thorough look through the exif data on the rest of the images, and there are quite a few images that don't have the correct shutter speed/iso, but they were sharp so I didn't look at them initially.

2013Dec06 15:01:28 14) IMG_1010.JPG
2013Dec06 15:01:28  meter : Tv:1/200 Av:5.6 Sv:80 832:832
2013Dec06 15:01:29  actual: Tv:1/1600 Av:- Sv:640

This one ended up shooting 1/125 at f5.6 iso 50. I don't think there's any way that the zoom would have been engaging since the FOV of all of the images is the same.


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Offline Wreck

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #48 on: 07 / December / 2013, 19:20:32 »
Just did a test with the AV Mode set to NDFilter, and pretty much every shot is way overexposed, generally with a shutter speed of 1-250-1/400 at iso 50 (target shutter speed was set to 1/1250)

2013Dec08 11:17:17 14) IMG_1114.JPG
2013Dec08 11:17:17  meter : Tv:1/320 Av:5.6 Sv:80 923:923
2013Dec08 11:17:17  actual: Tv:1/1250 Av:- Sv:250
2013Dec08 11:17:17          AvMin:2.8 NDF:NDout foc:infinity
2013Dec08 11:17:23 15) IMG_1115.JPG
2013Dec08 11:17:24  meter : Tv:1/400 Av:5.6 Sv:80 927:927
2013Dec08 11:17:24  actual: Tv:1/1250 Av:- Sv:250
2013Dec08 11:17:24          AvMin:2.8 NDF:NDout foc:infinity
2013Dec08 11:17:30 16) IMG_1116.JPG
2013Dec08 11:17:30  meter : Tv:1/400 Av:5.6 Sv:80 958:958
2013Dec08 11:17:31  actual: Tv:1/1250 Av:- Sv:200
2013Dec08 11:17:31          AvMin:2.8 NDF:NDout foc:infinity
2013Dec08 11:17:37 17) IMG_1117.JPG
2013Dec08 11:17:37  meter : Tv:1/500 Av:5.6 Sv:80 973:973
2013Dec08 11:17:37  actual: Tv:1/1250 Av:- Sv:200
2013Dec08 11:17:38          AvMin:2.8 NDF:NDout foc:infinity
2013Dec08 11:17:43 18) IMG_1118.JPG
2013Dec08 11:17:44  meter : Tv:1/640 Av:5.6 Sv:80 1039:1039
2013Dec08 11:17:44  actual: Tv:1/1250 Av:- Sv:120
2013Dec08 11:17:44          AvMin:2.8 NDF:NDout foc:infinity
2013Dec08 11:17:50 19) IMG_1119.JPG
2013Dec08 11:17:50  meter : Tv:1/250 Av:5.6 Sv:n/a 947:947
2013Dec08 11:17:50  actual: Tv:1/1250 Av:- Sv:200
2013Dec08 11:17:51          AvMin:2.8 NDF:NDout foc:infinity

From Exif:
IMG_1114.JPG - 1/200, f5.6, iso 50
IMG_1115.JPG - 1/250 f5.6 iso 50
IMG_1116.JPG - 1/250 f5.6 iso 50
IMG_1117.JPG - 1/320 f5.6 iso 50
IMG_1118.JPG - 1/500 f5.6 iso 50
IMG_1119.JPG - 1/1250 f5.6 iso 200

Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #49 on: 07 / December / 2013, 19:58:55 »
Just did a test with the AV Mode set to NDFilter, and pretty much every shot is way overexposed, generally with a shutter speed of 1-250-1/400 at iso 50 (target shutter speed was set to 1/1250)
Looks like you took those shots in bright light?  In every one of those shots, the camera appears to be inserting the ND filter and taking an exposure reading that way. This is different behavior from what I've seen on my cameras - I will have to study it a bit.

Meanwhile, I think you will find that the shutter speed used is actually 1/1250.   The exif values are not correct.
Ported :   A1200    SD940   G10    Powershot N    G16

 

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