KAP & UAV Exposure Control Intervalometer Script - page 100 - Completed and Working Scripts - CHDK Forum
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KAP & UAV Exposure Control Intervalometer Script

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Offline reyalp

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #990 on: 04 / December / 2018, 17:20:42 »
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Quote from: waterwingz on 04 / December / 2018, 13:52:32
Edit : I spent 10 minutes chasing through the get_focus() code hoping to see if -1 means "infinity" - which is my suspicion.  Might be - ran out of time to chase it further. Sorry.
Yes. When you set_focus (or AF on a distant object, or use Canon MF, on cameras that have it) beyond a certain (camera / zoom dependent) distance, you start getting -1 back from get_focus.

This does not necessarily mean that it's the focus setting that gives the best focus for distant objects, and at lest in the Canon MF case, there can be many focus positions beyond where get_focus starts returning -1.
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Offline OhSnap

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #991 on: 04 / December / 2018, 19:52:02 »
Waterwigz I tested that with a small script I made that just looped and read get_focus().


It works in a weird way since I seem to max out the focus at roughly 1m, even though
reported value is 3353. 


reyalp .. is it normal that it maxes out so quick ? Or could get_focus() be inconsistent ?
If it is true that puts an end to the auto lens retract idea  :-[


Waterwingz, would you want to see the battery gimmick I added ? In case you'd like to use it.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #992 on: 04 / December / 2018, 21:01:11 »
Quote from: OhSnap on 04 / December / 2018, 19:52:02
Waterwigz I tested that with a small script I made that just looped and read get_focus().
Did your script do "half press" requests to make the camera refocus between each call to get_focus() ?

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It works in a weird way since I seem to max out the focus at roughly 1m, even though reported value is 3353.  reyalp .. is it normal that it maxes out so quick ? Or could get_focus() be inconsistent ?
I spent a lot of time working and reworking the MF stuff in CHDK. One of my conclusions over time was that while most cameras could be tricked into setting a fixed focus point, the calibration on the models that do not offer true MF under Canon control is pretty much non-existent.  The functions to set focus are in the code but somehow not calibrated - or at least the lens mechanism goes to some fixed position but Canon made no attempt to make that position represent the focus distance requested. 

I would expect the same lack of calibration exists with get_focus( ) too.

I gave some thought to adding a manual calibration function to CHDK so that a user could adjust where CHDK tells the Canon firmware to position the lens for each requested real distance.  It's on my "someday" list as actually performing the calibration would be slow, finickity, and tedious.

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Waterwingz, would you want to see the battery gimmick I added ? In case you'd like to use it.
Sure.  Although I'm not sure every CHDK camera can actually produce sounds - I'm pretty certain some of mine don't.
« Last Edit: 04 / December / 2018, 21:07:09 by waterwingz »
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Offline reyalp

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #993 on: 04 / December / 2018, 23:33:36 »
Quote from: OhSnap on 04 / December / 2018, 19:52:02
reyalp .. is it normal that it maxes out so quick ? Or could get_focus() be inconsistent ?
My SX710 goes to -1 around ~4000 at full wide. The point where it changes seems to vary, while I was playing around with manual control sometimes it would go to 4400 and sometimes 3900. At longer zooms, the values go much higher.

This .txt https://app.box.com/s/83xz0ltib3v5ebq6m8edlpn8ju2c4wcb is a log from testing elph180 with chdkptp. Between the 2nd and 3rd runs, I zoomed the lens in and back out to fully wide. (linked because attachments seem to be broken at the moment)
Quote from: waterwingz on 04 / December / 2018, 21:01:11
Did your script do "half press" requests to make the camera refocus between each call to get_focus() ?
FWIW, this should not be needed if MF or AF lock is on (including set by set_mf or set_aflock if those work in the port)

According the ixus125_elph110hs platform_camera.h, SD override is only supported with set_mf or set_aflock.

edit: I assumed the script was doing set and get, if it's like waterwingz described, then disregard this.
« Last Edit: 05 / December / 2018, 00:23:53 by reyalp »
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #994 on: 05 / December / 2018, 00:12:12 »
Quote from: reyalp on 04 / December / 2018, 23:33:36
FWIW, this should not be needed if MF or AF lock is on (including set by set_mf or set_aflock if those work in the port)
if i understood the description of his script correctly, it just looped calling get_focus( ).  No calls to set_focus( ). So with AFL or MF enabled, the focus distance should not change without a half-press.
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Offline OhSnap

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #995 on: 06 / December / 2018, 06:08:26 »
Quote from: waterwingz on 05 / December / 2018, 00:12:12
if i understood the description of his script correctly, it just looped calling get_focus( ).  No calls to set_focus( ). So with AFL or MF enabled, the focus distance should not change without a half-press.

Yes, I only looped having half-press and having set the camera focus mode to continuous AF.
This way the camera would refocus on every distance change. No need for set_focus().


Quote from: reyalp on 04 / December / 2018, 23:33:36
At longer zooms, the values go much higher.


Hmmm, maybe if I'd get the camera to zoom in I could get more distance before -1 appears.
Thus being able to use it for the before landing lens retract. Though zooming in and out does sound a bit of
a hassle I will probably give it a go.


Quote from: waterwingz on 04 / December / 2018, 21:01:11
Sure.  Although I'm not sure every CHDK camera can actually produce sounds - I'm pretty certain some of mine don't.


I use the play_sound function. And use the built in canon sounds. I suppose most have them ?
For anybody who wants to try it I have attached. There are other small changes too.
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Offline reyalp

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #996 on: 06 / December / 2018, 13:18:43 »
Quote from: OhSnap on 06 / December / 2018, 06:08:26
Yes, I only looped having half-press and having set the camera focus mode to continuous AF.
This way the camera would refocus on every distance change. No need for set_focus().
That makes sense. A lot of values only update on half press even if the underlying state updates continuously, but this doesn't apply to get_focus. Beware that continuous AF will prevent CHDK focus overrides from working.

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Quote from: waterwingz on 04 / December / 2018, 21:01:11
Sure.  Although I'm not sure every CHDK camera can actually produce sounds - I'm pretty certain some of mine don't.
I use the play_sound function. And use the built in canon sounds. I suppose most have them ?
AFAIK all powershots have sounds. The one tricky bit is if you mute sounds in the menu, it also mutes play_sound.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #997 on: 06 / December / 2018, 13:50:21 »
Quote from: reyalp on 06 / December / 2018, 13:18:43
A lot of values only update on half press even if the underlying state updates continuously, but this doesn't apply to get_focus.
For clarity then,  the value returned by get_focus( ) only updates after a half_press ?

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Offline reyalp

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #998 on: 06 / December / 2018, 16:28:27 »
Quote from: waterwingz on 06 / December / 2018, 13:50:21
For clarity then,  the value returned by get_focus( ) only updates after a half_press ?
No. I verified that the get_focus value updates continuously on SX710 in continuous AF mode, and I would expect it to be true of most/all other cameras.
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Offline waterwingz

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Re: KAP & UAV Exposure Control Intervalometer Script
« Reply #999 on: 06 / December / 2018, 16:40:02 »
Quote from: reyalp on 06 / December / 2018, 16:28:27
Quote from: waterwingz on 06 / December / 2018, 13:50:21
For clarity then,  the value returned by get_focus( ) only updates after a half_press ?
No. I verified that the get_focus value updates continuously on SX710 in continuous AF mode, and I would expect it to be true of most/all other cameras.
So the value returned by get_focus( ) only updates after a half_press unless you are using continuous AF mode, and in that case it updates continuously ?
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