KAP & UAV Exposure Control Intervalometer Script - page 25 - Completed and Working Scripts - CHDK Forum
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KAP & UAV Exposure Control Intervalometer Script

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Offline timvand

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #240 on: 19 / July / 2014, 15:12:19 »
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Quote from: waterwingz on 18 / July / 2014, 22:42:06
Could try dialing the Tv value back to 1/1000 and trying again tomorrow in normal day light.

Tv value:  1/1000
ISO:  Auto
« Last Edit: 19 / July / 2014, 17:00:24 by timvand »
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Offline MarkB

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #241 on: 10 / August / 2014, 17:27:46 »
Hi  taking this conversation from Facebook to here for the convenience of attaching files.

Walter Wing Mark Beauchamp : here's a preview of the next version of the script. It add a new parameter value in the script menu called "Meter Filter Factor" . Set it to High and see how it works for you ? https://app.box.com/s/3h6ugwo9pl06axrxqagx

So I did a test. http://youtu.be/85B2JNOnACk

Nothing exciting just off my balcony.  Initially I set infinity to AFL and I got the message  Focus not at infinity.  So I stopped it, took it out of CHDK  took a single image to get it to focus on a building, started the script again and got the same message.  Stopped it, took out of CHDK again, took a shot, set script to @shot, got the same message.  Stopped it again, took a shot, then set focus to none.  Started again and didn't get the message.  Seemed to hold focus for the entire sequence.  I have found when using yass or AUTOEXP3 it will sometimes drift in and out of focus.  I found the was more flickering and changes in exposure from shot to shot with this new version than I did when I used an older one.

I have attached the log.

Thanks,

Mark

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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #242 on: 10 / August / 2014, 19:15:28 »
Quote from: MarkB on 10 / August / 2014, 17:27:46
Hi  taking this conversation from Facebook to here for the convenience of attaching files.
Looking at the log,  the script takes each shot at the almost the same exposure setting - gradually increasing the ISO as the scene darkens towards the end. I should not have been flickering like that.

However,  the focus setting is all over the map - jumping from infinity to 1.2m (or so) and back and forth between shots.

Two quick things you could try.  First of all,  you seem to have servo_AF mode enabled in the Canon menu.  Can you disable that?

Then change the "Focus at Infinity" mode to MF and try that. Also,  try the script with the mode set to Off.

The only other think I can see that might be goofy is the way the ND filter is working.  I made some changes to that code in the CHDKplus.lua script.  I'll look to see if they are needed here.  In the mean time,  you could try disabling ND filter use in the script menu?

Edit :  can you post / drop box three or four sequential images from that series that exhibit a sudden exposure change ?
« Last Edit: 10 / August / 2014, 19:21:52 by waterwingz »
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Offline MarkB

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #243 on: 10 / August / 2014, 23:54:29 »
Sure.

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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #244 on: 11 / August / 2014, 10:05:13 »
Quote from: MarkB on 10 / August / 2014, 23:54:29
Sure.
These look to have been post processed? Do you have the originals from straight out of the camera?

Edit: the reason I ask is that the EXIF values in the images seem to match the exposure but they are completely different than what I see in the log file you posted?

Edit #2:  I noticed you are  asking for a shot rate of 2 second but the camera is not quite keeping up with that rate. Does the exposure look any better if you slow down to a 5 second per shot rate?
« Last Edit: 11 / August / 2014, 15:37:25 by waterwingz »
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Offline MarkB

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #245 on: 11 / August / 2014, 22:32:13 »
Oops, yes they were processed.  Here are some right out of the camera.   (the jpgs are too large to upload to the forum)
https://www.dropbox.com/sh/0n07d3p6u1elow0/AAByj9AgWALy6PG1-64VyAUXa   
Might not be the same images from the first batch.

I can turn off the servo_AF.

I will try to do a test in the next few day, with servo_AF off, ND filter off, 5 seconds, and infinity focus to off and see how that comes out.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #246 on: 11 / August / 2014, 22:57:58 »
Quote from: MarkB on 11 / August / 2014, 22:32:13
I will try to do a test in the next few day, with servo_AF off, ND filter off, 5 seconds, and infinity focus to off and see how that comes out.
Thanks - you probably only need 20 or so shots to see what helps. 

It would be good to get separate tests as you change each thing but start with the 5 seconds interval ?
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Offline MarkB

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #247 on: 12 / August / 2014, 16:47:46 »
Hi  did another test today.  More than 20 shots though I t least wanted to put together a few seconds of video.

http://youtu.be/i3XvwEM04ps

Initially looking at the jpeg's  they look good, no sudden changes in exposure. 

Started off with 5sec intervals, no ND, Servo AF off, focus none. No warning messages, though looking at log the focus moves around from time to time.

Second sequence same as above but enabled ND filter, same results.

Third sequence, changed focus to MF.  According to log focus stayed at infinity. Though looking at the jpegs they look out of focus. Though when the  focus was set to none and the log says infinity the jpeg looks sharp, it also looks sharp at 4.4m.  Just soft when set to MF

Fourth sequence set to AFL and I got the "Focus not at infinity message" so I stopped it early

Fifth sequence set to @shot, same message as above so stopped it.

So it looks like the exposure is getting better, but the there is still focus issues.

I am shooting another test right now, 5 sec  then 4sec, 3sec and 2sec to see if that creates the exposure issue.

Sorry about the log, I didn't delete the old one off the SD card so today's test was added to the one from the weekend.

 


« Last Edit: 12 / August / 2014, 23:14:08 by MarkB »
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Offline MarkB

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #248 on: 12 / August / 2014, 23:52:54 »
I did another test with v3.3.  With this one the ND Filter was in use and focus was set to MF, started off with 150 images as a 5sec interval, followed by 150 at 4sec, then 150 at 3sec and finishing off at 150 as 2sec interval.

Other than underexposing at the shorter interval (but that could be in part due to the conditions) the exposures seem fairly consistent.

In spite of script set to MF it appears to change from shot to shot. I am assuming some of my focus issues have to do with the camera itself and how it reacts to the script.  Could this me a case of not the right tool for the job?  Has there been anyone who had done a fair amount of timelapse with the S series camera (S90,S100,S110,S120) since they do have manual focus? 

http://youtu.be/9fv4pHQKmPs
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #249 on: 13 / August / 2014, 08:36:28 »
Quote from: MarkB on 12 / August / 2014, 23:52:54
I did another test with v3.3.  With this one the ND Filter was in use and focus was set to MF, started off with 150 images as a 5sec interval, followed by 150 at 4sec, then 150 at 3sec and finishing off at 150 as 2sec interval.
This is quite interesting.  The random jumps in exposure are all gone.  However, the script did not attempt to use the ND filter - probably because the shots were later in the day and the scene darker so it did not need to use it.  I'm thinking I need to do more testing of the ND filter use.

Quote
Other than underexposing at the shorter interval (but that could be in part due to the conditions) the exposures seem fairly consistent.
You are seeing the "filter factor" at work there.  The filtering is so high that the exposure changes lag the actual scene illumination changes as evening approaches.   I have an improve version of the filter I'm working on to remove a small offset error at high filter factors.  But you will probably want to Medium or even Low settings for the filter factor in any case based on what I see here.

Quote
In spite of script set to MF it appears to change from shot to shot. I am assuming some of my focus issues have to do with the camera itself and how it reacts to the script.  Could this me a case of not the right tool for the job?  Has there been anyone who had done a fair amount of timelapse with the S series camera (S90,S100,S110,S120) since they do have manual focus? 
There have been many thousands of CHDK timelapses with all kinds of cameras.  I personally have used my G, S, IXUS, A and SX series cameras.   However,  the vast majority of all those sessions have been with the camera in autofocus mode or with a simple AFL set at the start of the script.  On many of those cameras, up until recently, the AFL really did nothing.

In the last eight month, there has been a lot of work done on using MF & AFL for manual focus ( a.k.a Subject Distance override ) in CHDK 1.3.0.   The rather long forum thread is here : Setting focus from scripts or menus

I thought we had made pretty good progress as we seemed to be able to make most cameras work in MF mode.  And those that did not would focus in AFL mode instead.   At least based on the test script we used they all seemed to work.

However, I've come to realize that we actually only evaluated the ability to set  focus distances between 0.4 meters and 1.0 meters. We reported success based on the camera's reported subject distance versus the focus distance requested.  While I checked the resulting images from my cameras, the majority of the test results did not, so the camera reported focus distance could be wrong too. 

So now we seem to have a few cameras that passed the tests but that do not manually focus well out to infinity ("soft images").  Even though reports from owners of the same camera models (including mine) do not have that problem when running the same tests.

And we seem to have cases where the MF setting gets lost after initially working.  Like in your tests. 

And even I have had issues with my A1200 : http://chdk.setepontos.com/index.php?topic=11078.msg111388#msg111388 that have never been resolved.

So for now I continue to collect test results, write new tests, study what we are seeing, and report it here.  Somewhat frustrating as I have not been able to reproduce the problems on my six different camera models.

tl;dr note : I would like to test the way the kap_uav.lua script handles the set focus at infinity part.  Are you are up for another test round?   Currently the script enables MF and/or AFL mode when it  starts but it  tries to set_focus before each shot as well  That should be fine but I'd like to see if that is actually causing issues so I've attached a modified version. Run a few hundred shots from your balcony in MF and AFL modes and see what happens to the reported focus setting ?   

Thanks - progress here will only be made here with the help of people like you !
« Last Edit: 13 / August / 2014, 08:46:25 by waterwingz »
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