Using YaDOF on A650

chrisr

20

Using YaDOF on A650

« on: 10 / March / 2016, 10:37:37 »

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I have this running, but have issues, need therapy.
http://chdk.wikia.com/wiki/UBASIC/Scripts:_yet_another_DOF_stacker

I can't make sense of it. I have too many "not sure"s.
I'm using an A650 not an A710 so ...?

When I run the script, it gets to
-set M/Av
-set focus
-set MF
-zoom_out for nearest
-zoom_in for inf

but as soon as I touch Zoom_out, zoom-in, or menu the script carries on, does the 5 second countdown and and starts taking.

Shouldn't it keep going round the Do loop until the user tells it to carry on?

And generally, does it matter what other CHDK features are enabled or not? Should overrides be on or off?

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waterwingz

12140

Re: Using YaDOF on A650

« Reply #1 on: 10 / March / 2016, 23:35:31 »

I'll take a look tomorrow.

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Ported : A1200 SD940 G10 Powershot N G16

chrisr

20

Re: Using YaDOF on A650

« Reply #2 on: 11 / March / 2016, 10:23:16 »

Thanks - curious as to what's (not) going on there. Could it be a setting I had?

But I've found one I like better, TimeFocus.bas.
It's better documented, closer to what I want, and......works!

Hmm, I shall need to alter the aperture mid stack, though.

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waterwingz

12140

Re: Using YaDOF on A650

« Reply #3 on: 11 / March / 2016, 12:49:45 »

Quote from: chrisr on 11 / March / 2016, 10:23:16

Thanks - curious as to what's (not) going on there. Could it be a setting I had?

Okay, I took a look at the code. And wished I had not done so. Cannot "unsee".

What you noticed :

Quote

but as soon as I touch Zoom_out, zoom-in, or menu the script carries on, does the 5 second countdown and and starts taking.

is exactly what the code is written to do. Which makes no sense if the zoom lever was intended to be used to set near and far focus setpoints as stated.

So I looked a bit closer at the code and decided it could be a text book example of why the "goto" statement in the BASIC language is so reviled. As such, I'm not going to spend any more time looking at it. Glad you found something you like better.

« Last Edit: 11 / March / 2016, 12:51:19 by waterwingz »

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Ported : A1200 SD940 G10 Powershot N G16

chrisr

20

Re: Using YaDOF on A650

« Reply #4 on: 11 / March / 2016, 15:39:55 »

Thanks much. I was thinking, "what the hell am I missing".

So that's 2 out of two scripts which , um, don't work. Though they've been sitting there for years.
Timefocus looks OK. Though I shall have to alter the aperture mid stack.
I need DOF to be more than 1mm.
Is there any reason why I shouldn't do that, after distance is xx mm, and still use Av to alter the shutter speed to compensate?

(Reason having run the numbers...
- the image is diffraction limited at any aperture smaller than f/2.8, so I want to use f/2.8.
I've found on a couple of other Powershots that wide open is sharpest. Chromatic aberration etc, tba.
Being out of focus is worse though, so I need to start off at 4/5 or something to give me 1mm dof.)

I'll try a pic of some exciting graph paper...

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chrisr

20

Re: Using YaDOF on A650

« Reply #5 on: 11 / March / 2016, 18:52:16 »

Works.
63 shots, f/4. Inch graph paper. Reduced to 50% size.
Jpeg artefacts quite strong.

63 at f4.jpg (740.43 kB, 1500x2000 - viewed 50 times.)

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waterwingz

12140

Re: Using YaDOF on A650

« Reply #6 on: 11 / March / 2016, 19:13:56 »

Quote from: chrisr on 11 / March / 2016, 18:52:16

Works. 63 shots, f/4. Inch graph paper. Reduced to 50% size. Jpeg artefacts quite strong.

Nice! Did you modify the script?

Incidentally, what are you using to post process those 63 shots?

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Ported : A1200 SD940 G10 Powershot N G16

chrisr

20

Re: Using YaDOF on A650

« Reply #7 on: 11 / March / 2016, 22:15:01 »

No mods yet. The stack starts at whatever focus is set. I may add an option to specify a distance.
There's obviously some CA there which might improve on stopping down, or raw processing. On many subjects it wouldn't show though.

I used Zerene stacker. Helicon is OK (costs more for a decent version) CombineZp is usually OK.
Photoshop is about the worst. Occasionally it's OK!

The LCD flexy has just started playing up

. I'm hoping that if I don't unfold the screen it'll be ok. No spares around. A650 is good for the screen folding, close focus, auxilliary lens tube, and proper AA batteries. Wider angle would be nice for in-your face stuff.
I have an S100, good for its 24mm equiv f/2 lens but close focus is ??5cm, and no tube mounting - and tiny battery. Next along is the G series I guess.

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waterwingz

12140

Re: Using YaDOF on A650

« Reply #8 on: 12 / March / 2016, 00:57:28 »

Quote

and tiny battery. Next along is the G series I guess

You can get past the battery issue with an external A/C supply. Figure on $25 for something shipped from China, $90 for the genuine Canon version. The Chinese clone versions have worked pretty well for me.

You can also get used Powershots on eBay in this price range. "A" series anyway - the G's tend to hold their value more.

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Ported : A1200 SD940 G10 Powershot N G16

chrisr

20

Re: Using Timefocus on A650

« Reply #9 on: 26 / April / 2016, 20:57:49 »

Getting old. I put the thing down for a few weeks then I've fogotten how it works...

It seems to have "gone wrong"!
In Timefocus you set the minimum focus distance and the range over which you want it to step the focus.

It was working, but now, though it appears on the screen to be stepping through, it's getting it wrong.

Say you want to start at 10mm and go to 30mm
It steps through, showing 1mm increments, but actually takes the picture at some other focus dictance like infinity, then it comes back to 11 or 12 or 13...
It's got out of phase somehow.
Can anyone see why it should alter the focussed distance apart from incrementing it?

To other annoyances
1) how do I move the SN etc focus distance info from being all over the central spot ? I know I red about that somewhere but I've forgotten.

and
2)whenever I go to a new pic, I find the focus is at infinity so I have to bring it right down again.
I think it's meant to go back to the minimum end, but it doesn't do that.
and

3) Can I try making the flash work? Any reason why it shouldn't?
I want to trigger external flash, wil have to use a slave I think.

Here it is. I'm not using the exposure altering facility at the moment.
Thanks

rem Save as timefocus.bas
rem uBASIC script by Eric Sandbo (kidtree) for CHDK, May 23, 2012
rem combines exposure bracketing and focus stacking
rem written for and tested on Powershot S3 IS.
rem Check use of variable M get_capture_mode for camera model compatibility.
@title SHUTTER & FOCUS STACKING
@param e Exposure steps
@default e 3
@param s Exposure step size (1/3rd)
@default s 4
print "Max. focus distance is 65.535m"
@param m Focus depth, meters
@default m 1
@param c centimeters
@default c 0
@param l millimeters
@default l 0
@param f focus depth, feet
@default f 0
@param i inches
@default i 0
if e < 1 then let e = 1
if e > 9 then let e = 9
if s < 2 then let s = 2
if s > 9 then let s = 9
rem D is total depth in mm
let D = (1000*m) + (10*c) + l + (305 * f) + (25 * i)
rem N is manually-focused distance; F is far distance
if D < 0 then let D = 0
rem Save closest focus for later restoration.
N = get_focus
rem calculate Farthest focus to shoot
F = N + D
if F > 65535 then let F = 65535
rem read mode dial setting. Must be set to Av (4) or M (5)
M = get_capture_mode
sleep 20
if not ((M = 4) or (M = 5)) then goto "wrong_mode"
print "Manual focus on"
print "closest point."
print "Preview off?"
print "Is remote enabled?"
press "shoot_half"
sleep 1800
release "shoot_half"
rem set focus variable to closest distance
X = N
rem get Center shutter speed from meter (Av mode) or user setting (Manual)
if M = 4 then let C = get_tv96 else let C = get_user_tv96
rem set to Lowest light bracket shot
let L = (C + ((e-1)*(s*16)))
if (D = 0) then gosub "one_shot" else gosub "focus_loop"
goto "restore"

:focus_loop
do
set_focus X
sleep 100
H = get_dof
sleep 50
if (H = 0) then H = 1
gosub "report"
gosub "exp_bracket"
rem H is -1 means DOF reaches to infinity, and we've finished.
if (H = -1) then goto "restore"
X = X + H
until X >= F
set_focus F
H = get_dof
sleep 50
set_focus (F-(H/3))
sleep 100
gosub "report"
gosub "exp_bracket"
return
:report
cls
print "Focus =", X; "mm"
print "DOF =", H
print "Far =", F
sleep 1500
return
:one_shot
gosub "exp_bracket"
return
:exp_bracket
for S = 0 to (e-1)
let T = (L - (S*(s*32)))
set_tv96_direct T
sleep 50
rem print "Shot", (S+1)
rem sleep 1500
click "shoot_full"
do
A = get_shooting
sleep 30
until (A = 1)
do
A = get_shooting
sleep 30
until (A = 0)
next S
return
:wrong_mode
print "set dial to"
print "Av or M"
goto "restore"
:restore
set_tv96 C
set_focus N
print "Ending now."
end

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