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Chdk for SX130 IS ?

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Offline waterwingz

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Re: Chdk for SX130 IS ?
« Reply #940 on: 17 / December / 2011, 14:29:05 »
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Quote from: bladyle on 17 / December / 2011, 14:18:20
In Alt mode I entered to the "Extra Photo Operations" & edited:
Disable Overrides: OFF
Override shutter speed: 3200
value factor: 1
shutter speed enum type: Ev step

but pictures still at 1/2500

What happens if you set  Override shutter speed: 125  ?  Do you get a picture at 1/125 second ?
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Offline bladyle

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Re: Chdk for SX130 IS ?
« Reply #941 on: 17 / December / 2011, 14:59:42 »
 1/125 work fine ..is that mean I can't use higher shutter speed from what I can use with default firmware?
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Offline waterwingz

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Re: Chdk for SX130 IS ?
« Reply #942 on: 17 / December / 2011, 15:27:58 »
Quote from: bladyle on 17 / December / 2011, 14:59:42
1/125 work fine ..is that mean I can't use higher shutter speed from what I can use with default firmware?
I'm not sure - somebody else will need to answer here.  However,  its possible that the shutter speed is going faster than 1/2500 but the camera just does not report it that high.  Are you seeing 1/2500 on the LCD display during review mode (where it displays all the information for the picture ) ? What about the EXIF information in the jpeg ?
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Offline outslider

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Re: Chdk for SX130 IS ?
« Reply #943 on: 17 / December / 2011, 16:09:38 »
Well, for SX130 I have done some photos with even 2000 seconds, but there is some limit above that value. I was unable to use 2h exposure, but I don't know the exact value of the limit.

I'm not sure about your ask - you tell about high shutter speed - I would call that very short time, but you are talking about 3200 seconds... 3200 means 3200 seconds, for high-speed (short time) you need to use something like 1/3200 or other value. Speeds like 1/20 000 consist no problems. I haven't try faster.
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Offline bladyle

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Re: Chdk for SX130 IS ?
« Reply #944 on: 17 / December / 2011, 16:56:28 »
lol my bad ...I mean 1/3200 no 3200 seconds. I check the results via review mode and there is 1/2500 even when I use 1/3200 or 1/4000. Is the result is same for you guys?

outslider you mean you tried 2000 and 1/20 000 and it works w/o problem?
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Offline outslider

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Re: Chdk for SX130 IS ?
« Reply #945 on: 17 / December / 2011, 17:01:11 »
Yes, I don't know why, but on sx130 overriden values are not saved in exif. I asked about it some time ago but I didn't get answer... Nevertheless, for me much more important is real value of shutter speed than this saved to exif data. you can check, wheter overriden 1/3200 photo is more dark than 1/2500 to be sure that it works.

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outslider you mean you tried 2000 and 1/20 000 and it works w/o problem?
True - no problems with taking photos with this kind of settings, but exif showed 15s and 1/2500 respectively...
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Offline bladyle

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Re: Chdk for SX130 IS ?
« Reply #946 on: 17 / December / 2011, 17:22:57 »
Exif values are not important to me. I'll check tomorrow with shorter shutter speed for difference in images.

What about aperture override? 3.49-16 is the limit for our cameras? I tried F16 and exif output is F11..

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Offline outslider

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Re: Chdk for SX130 IS ?
« Reply #947 on: 17 / December / 2011, 17:57:26 »
I used F16 many times, but now you made me wonder and I tried to compare F16, F~12 and F~7 and yes... 11 looks like the hardware limit. Images with 16 and 12 have exactly the same brightnes... That's sad!
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Offline bladyle

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Re: Chdk for SX130 IS ?
« Reply #948 on: 19 / December / 2011, 15:11:58 »
Very sad, shutter speed don't work also with higher speed than 1/2500 ..
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Offline Mr_Speedy

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Re: Chdk for SX130 IS ?
« Reply #949 on: 19 / December / 2011, 18:02:20 »
For those interested in camera aperture values, check out my previous post:
http://chdk.setepontos.com/index.php?topic=5691.msg75256#msg75256

As far as shutter speed override is concerned, the exif values are sometimes not correct, but the actual shutter speed is what you selected from the override. I have done tests and have verified that the camera does speeds over 1/2500. I have not tried all of them, but it definitely shoots over 1/2500 (even though the camera might display 1/2500 or another value whilst shooting). Just try and do a reference shot at 1/2000 and a second shot at some much higher speed... you will see that the image will be much darker.

ISO override goes down to ISO 50.
Aperture override as in the post I linked (F8.97  F10.07  F11.31 zoomed out...  F8.97  F10.07  F11.31  F12.69  F14.25  F16 when zoomed all the way in)
I have done long exposures up to a few minutes, I cant remember when it crashed, I think at 30 mins.

EDIT:  A quick test shows that the following shutter speeds have given a progressively darker picture (the speeds really work):  1/2500 (base exposure):  1/5000 works 1/10000 works  1/20000 works 1/40000 works.  I tried 1/80000 and 1/100000, and they failed to be darker than the 1/40000 exposure, meaning they dont work.
« Last Edit: 19 / December / 2011, 18:13:37 by Mr_Speedy »
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