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Focus function for EOS M3 / M10

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Offline c_joerg

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Focus function for EOS M3 / M10
« on: 11 / April / 2019, 04:10:34 »
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@Ant
https://chdk.setepontos.com/index.php?topic=12758.msg135783#msg135783


Quote from: Ant on 28 / December / 2017, 16:09:14
You can play with EFLensCom.* event procedures to control your lens.
For example type in chdkptp: lua call_event_proc("EFLensCom.FocusSearchFar")

I tried it and it works really well. But I only tried it with my cheapest lens ;)

Quote from: Ant on 30 / December / 2017, 16:53:21
add.
This command moves the focus 2500 steps forward with speed 10:
lua call_event_proc("EFLensCom.MoveFocus",2500,10)
Which influence could have greater speed? Where is the limit of speed?

What is the difference to 
Code: [Select]
EFLensCom.MoveFocusBySync ?


Quote from: Ant on 30 / December / 2017, 16:53:21
But we can get some info:
Code: [Select]
Subject Distance Near = 13 cm
Subject Distance Far  = 14 cm
Defocus Near = 1 mm
Defocus Far  = 6 mm

Target: 2500, Speed: 10

Focus Move Complete!!

Subject Distance Near = 232 cm
Subject Distance Far  = 316 cm
Defocus Near = 5 mm
Defocus Far  = 1 mm

Target: 2500, Speed: 10

Focus Move Complete!!

Subject Distance Near = 65535 cm
Subject Distance Far  = 65535 cm
Defocus Near = 6 mm
Defocus Far  = 1 mm

How do you get this information?
Does it comes from
Code: [Select]
EFLensCom.DistanceInfoget_focus() or DOF function delivers only 0.
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Offline Ant

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Re: Focus function for EOS M3 / M10
« Reply #1 on: 11 / April / 2019, 10:48:07 »
Quote from: c_joerg on 11 / April / 2019, 04:10:34
Which influence could have greater speed? Where is the limit of speed?

What is the difference to 
Code: [Select]
EFLensCom.MoveFocusBySync ?
I did not check this in detail.


Quote
How do you get this information?
Does it comes from
Code: [Select]
EFLensCom.DistanceInfo
Yes. This info was taken from console output captured using UART redirection.

Quote
get_focus() or DOF function delivers only 0.

These functions were not implemented because of EF communication protocol limitations.
https://chdk.setepontos.com/index.php?topic=12542.500
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Offline c_joerg

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Re: Focus function for EOS M3 / M10
« Reply #2 on: 11 / April / 2019, 11:47:18 »
Quote from: Ant on 11 / April / 2019, 10:48:07
This info was taken from console output captured using UART redirection.


Really useful information…

Quote from: Ant on 05 / January / 2019, 16:12:21
On EOS M3 these values can be taken directly from the lens using EFLensCom.DistanceInfo (0xFC43DF5E), or from structure in RAM at address 0x00244918.
The second way IMHO is better becuse it does not waste Camera<>Lense traffic.
That’s the way to get the Information in lua?
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Offline Ant

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Re: Focus function for EOS M3 / M10
« Reply #3 on: 11 / April / 2019, 13:00:21 »
Quote from: c_joerg on 11 / April / 2019, 11:47:18
That’s the way to get the Information in lua?

There need more firmware research because of some problems described there:
https://chdk.setepontos.com/index.php?topic=12542.msg139035#msg139035
Addresses can be vary for various lenses

How are you going to use "Subject Distance" information if it's readonly?
« Last Edit: 11 / April / 2019, 13:01:59 by Ant »
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Offline c_joerg

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Re: Focus function for EOS M3 / M10
« Reply #4 on: 11 / April / 2019, 13:18:45 »
Quote from: Ant on 11 / April / 2019, 13:00:21
How are you going to use "Subject Distance" information if it's readonly?

You could find out how big the MoveFocus increment is.
Example for stacking:
You take a picture with the actual focus.  Then you move the focus. The new Distance Near should be less than Distance Far from the previous picture to get an overlap. If there is no overlap, you have to move the focus back (may be with half steps). Or you do a lot of small steps.
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Offline pigeonhill

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Re: Focus function for EOS M3 / M10
« Reply #5 on: 11 / April / 2019, 15:58:32 »
@Ant

Not sure if it helps you or not, in my focus stacking script, https://chdk.fandom.com/wiki/Landscape_Focus_Bracketing_:_perfect_near_to_far_focus_brackets

I explicitly work out the next focus position, ie no need to muck about checking if the last far DoF overlaps the current near DoF.
« Last Edit: 11 / April / 2019, 16:18:06 by pigeonhill »
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Offline Ant

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Re: Focus function for EOS M3 / M10
« Reply #6 on: 15 / April / 2019, 13:27:09 »
Quote from: c_joerg on 11 / April / 2019, 11:47:18
Quote from: Ant on 05 / January / 2019, 16:12:21
On EOS M3 these values can be taken directly from the lens using EFLensCom.DistanceInfo (0xFC43DF5E), or from structure in RAM at address 0x00244918.
The second way IMHO is better becuse it does not waste Camera<>Lense traffic.
That’s the way to get the Information in lua?
Hmm. I didn't find there any script command related with the subject distance.
So there need to define it's name.
Then I can produce slightly modified function EFLensCom.DistanceInfo which will return the arithmetic mean value between near and far subject distance.

The variable at 0x00244916(0x00244918) is updated regularly only with my Canon lenses.
With my Sigma lens this variable is updated only when I take photo or switch play/rec mode.
You can check its behaviour with your lenses.

« Last Edit: 15 / April / 2019, 13:40:16 by Ant »
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Offline waterwingz

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Re: Focus function for EOS M3 / M10
« Reply #7 on: 15 / April / 2019, 13:50:34 »
Quote from: Ant on 15 / April / 2019, 13:27:09
Hmm. I didn't find there any script command related with the subject distance.
What about get_focus( ) & set_focus( ) - which are linked in the Lens Functions section of the Scripting Cross Reference Page.
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Offline Ant

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Re: Focus function for EOS M3 / M10
« Reply #8 on: 15 / April / 2019, 14:18:53 »
Ok. But currently my Sigma lens reports:
Quote
Subject Distance Near = 5442 cm
Subject Distance Far  = 8256 cm
Defocus Near = 255 mm
Defocus Far  = 3 mm

8256 cm is more than 65535 mm. What to do with the limit?
Is it necessarily to use millimeters as units?

Another quirk: with Sigma lens variables at 0x00244916/0x00244918 are updated regularly at playback mode but not in rec mode.
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Offline srsa_4c

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Re: Focus function for EOS M3 / M10
« Reply #9 on: 15 / April / 2019, 15:07:06 »
Quote from: Ant on 15 / April / 2019, 14:18:53
8256 cm is more than 65535 mm. What to do with the limit?
Newer cameras go over 65535, there is no such limit.
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