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SD800IS. Focus override crash. Need response/advice before 10am!.

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Offline rastetter

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SD800IS. Focus override crash. Need response/advice before 10am!.
« on: 08 / January / 2010, 00:28:57 »
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Hey, I'm driving from NY to FL tomorrow at 10am... and I intend on making a timelapse

- My first timelapse attempt, same camera... besides the annoying glare, I do notice the focus jumping all over the place, and I would like to stop that.. This time I'm going to be shooting the whole way to Florida.

I also have a brand new SX200 which would solve this focusing issue... BUT I am not sure that taking 15,000 pictures with a brand new camera is a bright idea (unless I can return it lol)

So how can I get a constant focus for my drive?
The camera just crashes when I turn that feature on and try to take a picture.
I found one other poster with a similiar problem, no resolution apparently?.. but since nobody else is complaining I assume there is?
« Last Edit: 08 / January / 2010, 00:36:13 by rastetter »
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Offline reyalp

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Re: SD800IS. Focus override crash. Need response/advice before 10am!.
« Reply #1 on: 08 / January / 2010, 01:27:49 »
Most likely focus override is broken on that camera, but it is difficult for someone who doesn't have it to fix.

According to the canon manual, the sd800 canon firmware has the ability to set focus to infinity (page 15 of the canon basic manual), which should be fine for driving timelapses. You may be able to set this in script using a propcase, although I don't see that identified in http://chdk.wikia.com/wiki/Propertycase I would guess that on a propset 1 camera it would be some value in propcase 11. You can use the property case display under misc->debug options to figure what propcase and value.

You may also be able to use af lock, either from script (set_aflock http://chdk.wikia.com/wiki/CHDK_firmware_usage/MoreBest#set_aflock ) or using button presses (page 48 of the canon advanced manual.)
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Offline rastetter

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Re: SD800IS. Focus override crash. Need response/advice before 10am!.
« Reply #2 on: 08 / January / 2010, 01:42:13 »
thanks,
I just stumpled on this AFlock business, i was just about to go looking for the scripting info. So i can autoload the script with the display off. itll take the first shot and focus somewhere along the lines of Infinity. But Just how far is 'infinity'?  

A semester of C isn't cuttin it, I cant figure out this scripting language right now... Cant find where it actually takes the picture? looks too short to work too lol.  I gotta get to bed, someone out there please add
http://chdk.wikia.com/wiki/CHDK_firmware_usage/MoreBest#set_aflock
 to the script for me.  
I know when i look at it will all make sense.. just dont have time to look at more examples in other scripts and figuring this out.

Code: [Select]
rem Author - Keoeeit                
rem Upgraded by Mika Tanninen                
@title Ultra Intervalometer                
@param a Delay 1st Shot (Mins)                
@default a 0                
@param b Delay 1st Shot (Secs)                
@default b 0                
@param c Number of Shots (0 inf)                
@default c 0                
@param d Interval (Minutes)                
@default d 0                
@param e Interval (Seconds)                
@default e 10                
@param f Interval (10th Seconds)                
@default f 0              
n=0
t=(d*600+e*10+f)*100                
if c<1 then let c=0                
if t<100 then let t=100                
g=(a*60)+b
if g<=0 then goto "interval"                
for m=1 to g                
 print "Intvl Begins:", (g-m)/60; "min", (g-m)%60; "sec"                
 sleep 930                
 next m                
:interval              
  n=n+1
  if c=0 then print "Shot", n else print "Shot", n, "of", c                
  shoot                
  if n=c then end                
  sleep t                
  goto "interval"          
Thanks again
« Last Edit: 08 / January / 2010, 02:00:28 by rastetter »
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Offline reyalp

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Re: SD800IS. Focus override crash. Need response/advice before 10am!.
« Reply #3 on: 08 / January / 2010, 04:44:53 »
shoot takes the picture.

You should be able to set af lock manually before starting the script. Leave alt mode, half press the shutter, click the macro button, release the shutter. Go to alt mode and start the script.

If you want to focus at infinity (which is good for 3 meters+ according to the manual) just use the canon setting.
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Offline rastetter

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Re: SD800IS. Focus override crash. Need response/advice before 10am!.
« Reply #4 on: 08 / January / 2010, 09:05:58 »
nah i need it automated. Doesnt seem like you can focus lock the camera with the display off. so it would need to be in the script on autostart. I'll either keep it in infinitiy mode, or keep the display on then I guess.. Unless someone can show me how to add Aflock(1) to the script.
« Last Edit: 08 / January / 2010, 09:21:19 by rastetter »
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Offline reyalp

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Re: SD800IS. Focus override crash. Need response/advice before 10am!.
« Reply #5 on: 09 / January / 2010, 15:55:45 »
I suggest using infinity mode, it should be fine for in car. If you can find the correct propcase value, you can trivially add this to the script.
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Offline rastetter

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SD800 Autofocus lock script/ alternatives for long driving timelapse
« Reply #6 on: 10 / January / 2010, 13:47:38 »
well i took 10,400 pictures. I just used AFL, kept my display on, and kept changing the battery. Probably went through 7 batteries, the time it takes to charge is almost exactly how long it lasts, so i just had them swapping places.


I achieved good results, just very very fast at 30fps. Now to change the resolution of all pictures and pick out a good tune. Probably gonna be around 20fps.

I may do it again on my drive back up to NY just for the heck of it.
Idk I just dont like the idea of my camera refocusing every 4 seconds... Probably would save battery life, and strain/wear and tear on the camera no?

Also, I'm not sure if Infinity mode sticks on a camera reboot. It seemed to be hit and miss (maybe changing battery reset it to normal?)


Another thing I realized as I was driving was that the images are named IMG_####... WTF happens when I hit IMG_10000. I made new folders every so often to prevent any overwriting, but the camera seems to make a new folder every 2,000 pictures
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