command to set MF distance to hyperfocal distance

bisenberger

31

« on: 27 / March / 2012, 01:55:19 »

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Is there a command to set the MF focus distance to the hyperfocal distance?

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SkyWalker9

301
SX20 IS (fw 1.02b)

Re: command to set MF distance to hyperfocal distance

« Reply #1 on: 27 / March / 2012, 12:42:07 »

Quote from: bisenberger on 27 / March / 2012, 01:55:19

Is there a command to set the MF focus distance to the hyperfocal distance?

Not directly, however you can do the same thing using two statements. For uBasic you can use the following two commands. The first retrieves the hyperfocal distance and the second sets the focus to the value retrieved:

Code: [Select]

x=get_hyp_dist
set_focus x

The uBasic User's Guide and can be downloaded from here: http://images2.wikia.nocookie.net/__cb20100806022158/chdk/images/e/e5/UBASIC_User_Guide_D0_5.pdf
The uBasic & LUA commands can be found online on the CHDK web pages such as http://chdk.wikia.com/wiki/Script_commands & http://chdk.wikia.com/wiki/UBASIC/TutorialScratchpad
The already completed and working uBasic & LUA scripts are a good source of how to use many of the statements: http://chdk.setepontos.com/index.php?board=7.0

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bisenberger

31

Re: command to set MF distance to hyperfocal distance

« Reply #2 on: 27 / March / 2012, 13:37:48 »

Thanks SkyWalker9,
Very useful information and links.

Would the following work to set the focus distance to the hyperfocal distance and lock that focus to the hyperfocal distance for interval shooting?

Modified interval.bas included with latest CHDK.

Code: [Select]

@title Intervalometer
@title Intervalometer
@param a = interval (sec)
@default a 15
x=get_hyp_dist
set_focus x
set_aflock 1
do
    s = get_tick_count
	click "shoot_full"
    sleep a*1000 - (get_tick_count - s)
until ( 0 )

It doesn't appear to work. Will play with it some more tomorrow.

« Last Edit: 27 / March / 2012, 14:53:37 by bisenberger »

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funnel

349

Re: command to set MF distance to hyperfocal distance

« Reply #3 on: 27 / March / 2012, 16:01:25 »

Or you can just set the camera to manual focus mode, go into alt mode and press down key.

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SkyWalker9

301
SX20 IS (fw 1.02b)

Re: command to set MF distance to hyperfocal distance

« Reply #4 on: 27 / March / 2012, 20:34:04 »

Quote from: bisenberger on 27 / March / 2012, 13:37:48

...Would the following work to set the focus distance to the hyperfocal distance and lock that focus to the hyperfocal distance for interval shooting?...It doesn't appear to work...
Code: [Select]
@title Intervalometer @title Intervalometer @param a = interval (sec) @default a 15 x=get_hyp_dist set_focus x set_aflock 1 do s = get_tick_count click "shoot_full" sleep a*1000 - (get_tick_count - s) until ( 0 )

You might try the following revised version. I'm not able to test right now due to family commitments, but this should get you farther along.

Code: [Select]

@title Intervalometer
@param a interval (sec)
@default a 15
x=get_hyp_dist
set_focus x
set_aflock 1
do
    s = get_tick_count
        click "shoot_full"
    sleep a*1000 - (get_tick_count - s)
until ( 0 )

UBDebug (An Interactive Development Environment for CHDK uBasic Scripts) is a uBasic debugger that allows you to test scripts on your PC before trying on your camera. It's great if you want to test out changes to code. I've found it can save a lot of time on complex scripts by checking for various types of coding errors; it definitely reduces test time & wear-and-tear on you camera. While the "Start" button will actually run the script, the "Step" button allows you to step through each statement and see how a variable changes - this can save a lot of troubleshooting time. Here's the link: http://www.zenoshrdlu.com/kapstuff/zubdb.html

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bisenberger

31

Re: command to set MF distance to hyperfocal distance

« Reply #5 on: 27 / March / 2012, 22:46:05 »

Quote from: funnel on 27 / March / 2012, 16:01:25

Or you can just set the camera to manual focus mode, go into alt mode and press down key.

Tried this method, but the focus changes when using the intervalometer scripts.

I'm trying to come up with a way to use the hyperfocal distance focus with an intervalometer.

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