Time lapse with focus change

c_joerg

1173

« on: 18 / December / 2017, 05:23:56 »

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Interesting time lapse in which the focus is changed from near to infinitely continuously (1:05, 1:40). The focus change was made in this video per hand.

Are there any scripts that do that?
Is it possible to change focus in continuous mode or in half press?

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reyalp

13619

Re: Time lapse with focus change

« Reply #1 on: 18 / December / 2017, 16:02:04 »

Quote from: c_joerg on 18 / December / 2017, 05:23:56

Are there any scripts that do that?
Is it possible to change focus in continuous mode or in half press?

IIRC (caveat: it was several years ago and I don't see anything in my notes), I tried changing focus and zoom in the hook_shoot where rawopint and fixedint wait between shots and it worked.

However, the camera would not normally expect focus to change at this point. I would rate this as fairly high up on the list of potentially hardware-damaging things you can do with CHDK, so I'd suggest experimenting on a camera you wouldn't feel too bad about losing.

Camera specific variation in focus override behavior should also be expected. Particularly, I would expect a better chance of success in MF or AF lock, even if the camera is normally able to override in AF.

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c_joerg

1173

Re: Time lapse with focus change

« Reply #2 on: 21 / December / 2017, 04:48:03 »

Quote from: reyalp on 18 / December / 2017, 16:02:04

However, the camera would not normally expect focus to change at this point.

Most cameras have a continuous mode where they do auto focus…

Quote from: reyalp on 18 / December / 2017, 16:02:04

I would rate this as fairly high up on the list of potentially hardware-damaging things you can do with CHDK, so I'd suggest experimenting on a camera you wouldn't feel too bad about losing.

Yes of course…
But if I use my IXUS and it works, I can’t be sure that my G1x get damaged…

Quote from: reyalp on 18 / December / 2017, 16:02:04

Camera specific variation in focus override behavior should also be expected. Particularly, I would expect a better chance of success in MF or AF lock, even if the camera is normally able to override in AF.

How can I test?
I would go into CHDKPTP:

Code: [Select]

=press("shoot_half")

After autofocus

Code: [Select]

=set_aflock(0) or =set_mf(0)

And then see if focus changes with

Code: [Select]

set_focus(nnn)

If I want to change the focus from 0.5m to 100m in 100 steps. How should the focus change? Probably not linear or?

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M100 100a, M3 101a, G9x II (1.00c), 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), S45,
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reyalp

13619

Re: Time lapse with focus change

« Reply #3 on: 21 / December / 2017, 16:11:43 »

Quote from: c_joerg on 21 / December / 2017, 04:48:03

Quote from: reyalp on 18 / December / 2017, 16:02:04
However, the camera would not normally expect focus to change at this point.

Most cameras have a continuous mode where they do auto focus…

Only the higher end cameras, but even in that case, they probably don't do it at the same where the hook is.

OTOH, thinking about this more, CHDK has had focus bracketing long time. This is done in the raw hook, so doing the same in a script should be no riskier. I don't know how widely CHDK focus bracketing has been used.

Quote

But if I use my IXUS and it works, I can’t be sure that my G1x get damaged…

Of course, you can't be sure. But if it kills a cheap camera, I probably wouldn't try it on an expensive one...

Quote

How can I test?
I would go into CHDKPTP:
...

Normally, you should use set_mf or set_aflock before half press (a few cameras may require set_aflock() be inside half press). Since scripted key presses are reset between = calls, you have to do everything with half shoot held in one command, something like (untested off the top of my head)

Code: [Select]

=set_mf(true) press'shoot_half' repeat sleep(10) until get_shooting() local sd=500 while sd < 100000 do set_focus(sd) click'shoot_full_only' sd=sd*2 sleep(2000) end

Note that this would approximate the "quick" method, for cont mode you'd have to set up the raw hook and do it there.

Quote

If I want to change the focus from 0.5m to 100m in 100 steps. How should the focus change?

Not sure off hand. I'd probably just try linear e.g. sd_next = 1.05*sd and see if it look OK.

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c_joerg

1173

Re: Time lapse with focus change

« Reply #4 on: 22 / December / 2017, 11:10:59 »

Quote from: reyalp on 21 / December / 2017, 16:11:43

Note that this would approximate the "quick" method, for cont mode you'd have to set up the raw hook and do it there.

Yes of course, "quick" method is OK.

Quote from: reyalp on 21 / December / 2017, 16:11:43

Code: [Select]
=set_mf(true) press'shoot_half' repeat sleep(10) until get_shooting() local sd=500 while sd < 100000 do set_focus(sd) click'shoot_full_only' sd=sd*2 sleep(2000) end

I’m missing a release’shoot_half’ on the end. Is this a problem?

My S110 crashes immediately after running without any noise

Code: [Select]

ASSERT!! FocusLensController.c Line 1059

The IXUS160 runs, but the effect is very small. Maybe it’s the depth of field of the small sensor. What about set_mf on the IXUS160? The IXUS160 has no MF Focus Mode.

Quote from: reyalp on 21 / December / 2017, 16:11:43

I don't know how widely CHDK focus bracketing has been used.

I have looked at some focus bracketing scripts. The most do set_focus before a full shoot.

ROMLOG.LOG (4.13 kB - downloaded 32 times.)

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reyalp

13619

Re: Time lapse with focus change

« Reply #5 on: 22 / December / 2017, 13:18:49 »

Quote from: c_joerg on 22 / December / 2017, 11:10:59

I’m missing a release’shoot_half’ on the end. Is this a problem?

No. CHDK script keys are released when the script ends. Each = command in chdkptp is a separate script, so all the keys are released when it ends. That's why you have to put everything in one = command.

Quote

My S110 crashes immediately after running without any noise

Code: [Select]
ASSERT!! FocusLensController.c Line 1059

Make sure things like continuous AF and servo AF are disabled in the Canon menu. You could also try moving the set_focus so the first is set before the first shot, and the rest are set after, like

Code: [Select]

=set_mf(true) local sd=500 set_focus(sd) press'shoot_half' repeat sleep(10) until get_shooting()  while sd < 100000 do  click'shoot_full_only' sd=sd*2 sleep(2000) set_focus(sd) end

Quote

The IXUS160 runs, but the effect is very small. Maybe it’s the depth of field of the small sensor. What about set_mf on the IXUS160? The IXUS160 has no MF Focus Mode.

set_mf works on some cameras that don't have MF in the canon UI. According to this https://chdk.setepontos.com/index.php?topic=11078.msg135482#msg135482 ixus160 should be one of them.

Quote

Quote from: reyalp on 21 / December / 2017, 16:11:43
I don't know how widely CHDK focus bracketing has been used.

I have looked at some focus bracketing scripts. The most do set_focus before a full shoot.

CHDK has a subject distance option in the built in "bracketing in continuous mode".

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c_joerg

1173

Re: Time lapse with focus change

« Reply #6 on: 22 / December / 2017, 14:26:16 »

Quote from: reyalp on 22 / December / 2017, 13:18:49

Make sure things like continuous AF and servo AF are disabled in the Canon menu.

Yes of course. Everything think is switched of. Also, Safety shift.

Quote from: reyalp on 22 / December / 2017, 13:18:49

You could also try moving the set_focus so the first is set before the first shot, and the rest are set after, like

The difference is, that the S110 made now one shoot and crashes than. Also, when I set the cam in MF on Canon menu the cam crashes.

If I set the cam in MF on Canon menu and do the following commands in chdkptp

Code: [Select]

=set_focus(500)
=set_focus(500000)

Then I see how the focus changes in Liveview. If I do a shoot in chdkptp than the cam crashes sometimes as well (1 from 10 shoots).

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reyalp

13619

Re: Time lapse with focus change

« Reply #7 on: 22 / December / 2017, 16:01:27 »

Quote from: c_joerg on 22 / December / 2017, 14:26:16

Then I see how the focus changes in Liveview. If I do a shoot in chdkptp than the cam crashes sometimes as well (1 from 10 shoots).

To be clear, it crashes if you
1) set mf in canon
2) Use set_focus, outside of shooting
3) shoot several times?

Or is the crash only with the test code that uses set_focus() in half press?

You can try set_aflock() instead of set_mf(). I suspect it will be the same, but some cameras have different behavior in af lock vs MF.

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