KAP & UAV Exposure Control Intervalometer Script - page 16 - Completed and Working Scripts - CHDK Forum
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KAP & UAV Exposure Control Intervalometer Script

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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #150 on: 19 / April / 2014, 16:37:04 »
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Hi Waterwingz,

Today I have made some flights using script version 2.3 , looking at the log it seems that now, using MF mode, all the pictures are focused at infinity. :)

I have noticed that , even if in the script the interval between pictures is set at 3 seconds, the pictures are captured at an interval of 2,3 or even 4 sec , what could cause this ?

And last observation , majority of pictures were blurry. In the KAP log I saw almost all over the place :  " actual: Tv:1/800" , also the sky was covered by clouds... Could I "force" somehow to have values for Tv around 1/1600 ?

Thank you.
« Last Edit: 19 / April / 2014, 16:59:38 by mirax7 »
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #151 on: 19 / April / 2014, 17:17:00 »
Quote from: mirax7 on 19 / April / 2014, 16:37:04
I have noticed that , even if in the script the interval between pictures is set at 3 seconds, the pictures are captured at an interval of 2,3 or even 4 sec , what could cause this ?
The script is only working in 1 second increments, so some variation around the interval setpoint is to be expected.   I'll take a look at switching to milliseconds and see if I can get the interval to be more repeatable.

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And last observation , majority of pictures were blurry. In the KAP log I saw almost all over the place :  " actual: Tv:1/800" , also the sky was covered by clouds... Could I "force" somehow to have values for Tv around 1/1600 ?
Blurry is not good.  The script is doing what it can with the available light.  Hoever, you have set the maximum ISO to 800 so it likely can't set the shutter speed much over 1/800 second and still get the correct exposure.

You can try allowing a higher value for ISO Max2 and/or you can force a minimum shutter speed using the TV Min setting.   If you end up with underexposed pictures,  you can usually fix that up somewhat in your computer.  Blurry tends to be permanent.

Update : v2.4 of the script now available for download - interval timing should be more precise
« Last Edit: 19 / April / 2014, 19:20:28 by waterwingz »
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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #152 on: 20 / April / 2014, 02:13:40 »
Quote from: waterwingz on 19 / April / 2014, 17:17:00

Update : v2.4 of the script now available for download - interval timing should be more precise

Waterwingz , you are moving SO FAST !!!

I will try today the v 2.4.
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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #153 on: 20 / April / 2014, 12:18:41 »
Waterwings ,

Attached the log after 3 flights done today with v2.4.

I am using a low cost SD card, I suppose that the Write speed is not very high , maybe this could cause the issue regarding the interval between pictures ?

Today it was a very sunny weather and I have tried to do pictures both in MF and AFL mode. While analyzing the pictures it seems that during AFL mode the percentage of NOK pictures is mush smaller ( by NOK picture I mean blurry).

Thank you.
« Last Edit: 20 / April / 2014, 12:29:50 by mirax7 »
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #154 on: 20 / April / 2014, 12:55:58 »
Quote from: mirax7 on 20 / April / 2014, 12:18:41
Attached the log after 3 flights done today with v2.4.
The log showing taking 324 seconds to take 100 shots or about 3.2 seconds per shot (if my math is correct) and you asked for a  3 second shot rate.  Pretty close.  Just for fun, what does it look like if you ask for a 5 second shot rate?

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I am using a low cost SD card, I suppose that the Write speed is not very high , maybe this could cause the issue regarding the interval between pictures ?
That might make a small difference.  I can't tell from the log - do you have RAW or DNG enabled?  That would make a huge difference.
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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #155 on: 20 / April / 2014, 13:21:35 »
Quote from: waterwingz on 20 / April / 2014, 12:55:58
Quote from: mirax7 on 20 / April / 2014, 12:18:41
Attached the log after 3 flights done today with v2.4.
The log showing taking 324 seconds to take 100 shots or about 3.2 seconds per shot (if my math is correct) and you asked for a  3 second shot rate.  Pretty close.  Just for fun, what does it look like if you ask for a 5 second shot rate?

Tomorrow I will try.

Quote from: waterwingz on 20 / April / 2014, 12:55:58
That might make a small difference.  I can't tell from the log - do you have RAW or DNG enabled?  That would make a huge difference.
RAW and DNG are not enabled.

To tagg the images with latitude/longitude what are the steps that I must follow ?

1.at CHDK settings/GPS-Settings - enable the GPS-CHDK;
2.tagging-Settings:
2.1. Save waypoint to each JPG- enable;
2.2. Wait for GPS signal - 300 ?!!?

Can you guide me to some instructions regarding the GPS goodies :) ?

Thank you.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #156 on: 20 / April / 2014, 13:24:13 »
Quote from: mirax7 on 20 / April / 2014, 13:21:35
Can you guide me to some instructions regarding the GPS goodies :) ?
Sorry - don't have a camera with GPS so I've never looked at it.  I'd be guessing, just like you.

But have you enabled this feature already?  That could slow down the shot rate I expect.
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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #157 on: 05 / May / 2014, 16:00:12 »
Hi Waterwingz,

The information regarding ISO are recorded for each picture in the log ?

Or , in another words, what is the meaning of the parameters from below ( eg. Sv) :

2014May03 08:19:28 1) IMG_6422.JPG
2014May03 08:19:28  meter : Tv:1/160 Av:4.0 Sv:100 720:720
2014May03 08:19:29  actual: Tv:1/1600 Av:3.2 Sv:500
2014May03 08:19:29          AvMin:3.2 NDF:NDout foc:infinity


Thank you.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #158 on: 05 / May / 2014, 19:09:28 »
Quote from: mirax7 on 05 / May / 2014, 16:00:12
The information regarding ISO are recorded for each picture in the log ?
Yes.

Quote
Or , in another words, what is the meaning of the parameters from below ( eg. Sv) :
2014May03 08:19:28 1) IMG_6422.JPG
2014May03 08:19:28  meter : Tv:1/160 Av:4.0 Sv:100 720:720
2014May03 08:19:29  actual: Tv:1/1600 Av:3.2 Sv:500
2014May03 08:19:29          AvMin:3.2 NDF:NDout foc:infinity
Tv , Av,  Sv are standard acronyms for Time Value (shutter speed).  Aperature Value (f-stop), and Sensitivity Value (ISO setting).

shot number :  1)
filename :    IMG_6422.JPG

meter = exposure value the camera would use if it was in Auto mode
  • shutter speed  :  Tv  :  1/160 second
  • aperture         :  Av  :  4.0 f-stop
  • sensitivity       :  Sv  :  100 ISO setting

measured brightness & measured brightness with exposure compensation :  720:720

actual = exposure value the CHDK script will force instead of the metered values
  • shutter speed  :  Tv  :  1/1600 second
  • aperture         :  Av  :  3.2 f-stop
  • sensitivity       :  Sv  :  500 1SO setting

minim f-stop available at current zoom position : AvMin:3.2
neutral density filter mode                             :   NDF:NDout   ( NDin / ND out)
focus :                                                        :  foc:infinity
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Offline mirax7

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #159 on: 06 / May / 2014, 14:54:00 »
Thanks a lot !

Today I have done 2 flights using the same value for shutter speed but using different values for ISO ( I am working to find the best camera settings).

After the flights while looking at the pictures I observed that the pictures from the second flight are more blurry , the reason could be the weird value for shutter speed from the KAP log (the value is totally different from my settings, I have as target 1/1600 and the pictures are at 1/320 for example).

Is there any relation between ISO target values and Shutter speed target values (one of the parameters has "priority" comparing with the other one?).

Attached the log.
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