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Chdk for SX130 IS ?

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Offline reyalp

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Re: Chdk for SX130 IS ?
« Reply #960 on: 26 / December / 2011, 00:01:25 »
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Quote from: smartblue on 25 / December / 2011, 23:48:45
My SX130 can do 3fps in low light mode  1600x1200 2M only . but not others mode, wonder if I can use CMDK to limited to ISO 80 in low light mode so I can have faster and better picture @ the same time, and the most important to check with ppl if they can make 3fps working beside "low light mode". thanks
Yes, this should probably work, it works on some other cameras with low light mode. Just use ISO override http://chdk.wikia.com/wiki/CHDK_User_Manual#Override_ISO_value

Note the ISO override values are slightly different from the display value, you probably want to enter 50 to get what the canon firmware displays as 80.

On D10, it appears to that the Canon auto-exposure correctly accounts for the ISO override, so you don't need to override the shutter speed to get correct exposure.
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Offline Vash11779

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Re: Chdk for SX130 IS ?
« Reply #961 on: 26 / December / 2011, 13:10:07 »
i have a question earlier in this thread someone was able to make a DIY macro converter for there SX130 i was wondering if its possible to make a telephoto lens as well or just what size or how to figure out what size lens would work
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Offline smartblue

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Re: Chdk for SX130 IS ?
« Reply #962 on: 29 / December / 2011, 18:41:37 »
Quote from: reyalp on 26 / December / 2011, 00:01:25
Quote from: smartblue on 25 / December / 2011, 23:48:45
My SX130 can do 3fps in low light mode  1600x1200 2M only . but not others mode, wonder if I can use CMDK to limited to ISO 80 in low light mode so I can have faster and better picture @ the same time, and the most important to check with ppl if they can make 3fps working beside "low light mode". thanks
Yes, this should probably work, it works on some other cameras with low light mode. Just use ISO override http://chdk.wikia.com/wiki/CHDK_User_Manual#Override_ISO_value

Note the ISO override values are slightly different from the display value, you probably want to enter 50 to get what the canon firmware displays as 80.

On D10, it appears to that the Canon auto-exposure correctly accounts for the ISO override, so you don't need to override the shutter speed to get correct exposure.

Thanks reyalp,  I wonder if someone can hack to make 3fp in NON-low light mode. assuming  low light mode using some internal buffer for processing 12M image and scale down to 2M with noise removal process. I do not know why using M/S/Tv mode with  2M setting with continuous mode can't get 3FPS??
I know to make use of those internal buffer may not possible  outside  low light mode,
But is it possible to mod the firmware to increase resolution in low light mode instead??
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Offline reyalp

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Re: Chdk for SX130 IS ?
« Reply #963 on: 29 / December / 2011, 23:54:12 »
Quote from: smartblue on 29 / December / 2011, 18:41:37
Thanks reyalp,  I wonder if someone can hack to make 3fp in NON-low light mode. assuming  low light mode using some internal buffer for processing 12M image and scale down to 2M with noise removal process. I do not know why using M/S/Tv mode with  2M setting with continuous mode can't get 3FPS??
You can accomplish this by using low light mode and overriding the other settings with CHDK. Not very convenient though.
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I know to make use of those internal buffer may not possible  outside  low light mode,
I'm quite sure this isn't an extra buffer. Rather the low light mode is reducing the resolution somewhere very early in the pipeline, and for whatever reason, regular low res mode doesn't do this.
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But is it possible to mod the firmware to increase resolution in low light mode instead??
I doubt it. I'd expect the low resolution is inherent to the low light mode, e.g. http://www.noao.edu/outreach/aop/glossary/binning.html
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Offline Mr_Speedy

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Re: Chdk for SX130 IS ?
« Reply #964 on: 30 / December / 2011, 12:41:11 »
I realize that the aim here is to get 3fps shooting. But since the topic also mentions low light mode, I thought I'd add this slightly off topic: 
Personally I shoot using ISO 1600 RAW (DNG) when there is low light, and just brighten the picture in photoshop if ISO 1600 is not enough (I dont use low light mode). You get the equivalent of ISO 3200, 6400 etc when you expose 1-2 stops darker than an optimal exposure, and then lighten it later. You have more control over the noise reduction when you do it yourself, and have full resolution to start with. I have even gotten the equivalent of ISO 96000, but you can barely see the image :D

Ill post an example:
http://www17.zippyshare.com/v/89557961/file.html
ISO 6400 is more or less the maximum is you want any sort of usable shot.
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Offline reyalp

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Re: Chdk for SX130 IS ?
« Reply #965 on: 30 / December / 2011, 14:19:59 »
Quote from: Mr_Speedy on 30 / December / 2011, 12:41:11
Personally I shoot using ISO 1600 RAW (DNG) when there is low light, and just brighten the picture in photoshop if ISO 1600 is not enough (I dont use low light mode). You get the equivalent of ISO 3200, 6400 etc when you expose 1-2 stops darker than an optimal exposure, and then lighten it later.
Err, brightening it in photoshop is not the same as increasing the ISO, although to be fair, in many Canon firmwares the last stop of ISO is doing the equivalent in jpeg processing rather than actually increasing the sensor gain (e.g. on cameras that go up to ISO 800, raws for ISO 400 and 800 are identical but the jpeg is brighter)
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Offline smartblue

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Re: Chdk for SX130 IS ?
« Reply #966 on: 30 / December / 2011, 14:25:43 »
Ms_speedy, Thanks for your info.

   so  Canon SX130 shutter mechanically  capable to shoot 3fps, hope this thread will bring some attention to CHDK developer to look into how to improve fps on SX130 in normal mode.  I did simple compare between normal 2M vs low light 2M picture , the normal 2M look a lot clear  then the one shoot from low light mode even they have same ISO,shutter and Aperture. so forget about 3fps for low Q image  , 1280x720 @ 30fps HD movie shooting mode may be my answer.

Anyway,  when shooting in 3fps, people around me  feel like I am using a professional camera  :D
so it is a way to show off with 3fps. 
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Offline reyalp

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Re: Chdk for SX130 IS ?
« Reply #967 on: 30 / December / 2011, 14:37:48 »
Quote from: smartblue on 30 / December / 2011, 14:25:43
   so  Canon SX130 shutter mechanically  capable to shoot 3fps, hope this thread will bring some attention to CHDK developer to look into how to improve fps on SX130 in normal mode. 
This is extremely unlikely. Shooting speed is a significant selling point, and the P&S market is extremely competitive.. If it were easily available from the hardware without loss of quality, Canon would use it in the factory firmware.

Note that some Canon cameras do have a dedicated low res "quick" mode, which I assume is the same as low light + overrides.
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I did simple compare between normal 2M vs low light 2M picture , the normal 2M look a lot clear  then the one shoot from low light mode even they have same ISO,shutter and Aperture.
Which probably answers the question of why Canon does not use this for normal 2M images.
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so forget about 3fps for low Q image  , 1280x720 @ 30fps HD movie shooting mode may be my answer.
I suspect you will find that frame grabs from video are significantly lower quality than even the low light stills.
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Offline Microfunguy

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Re: Chdk for SX130 IS ?
« Reply #968 on: 30 / December / 2011, 15:49:37 »
Quote from: reyalp on 30 / December / 2011, 14:37:48
I suspect you will find that frame grabs from video are significantly lower quality than even the low light stills.

Which reminds me to check which small number of (non-Canon) cameras support 1280x720 MJPEG movies.
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Offline Mr_Speedy

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Re: Chdk for SX130 IS ?
« Reply #969 on: 31 / December / 2011, 05:26:38 »
I agree Reyalp, brightening in Photoshop is not the same as ISO. I did say "ISO equivalent" as opposed to real ISO. The SX130IS only goes up to ISO 1600 in hardware, as far as I know. (I think) it uses the ISO 1600 RAW in low light mode and brightens it one or two stops for the low light mode "ISO 3200 or ISO 6400" etc. The quality is not any better than what I am getting from the ISO 1600 + brightening.

Also, I have to question if the camera even supports ISO 1600 at the hardware level.

Theoretically, the following should give the same exposure:

ISO 100   1/10 sec
ISO 200   1/20 sec
ISO 400   1/40 sec
ISO 800   1/80 sec
ISO 1600 1/160 sec

Going from ISO 100 to ISO 800, the exposures look identical (besides noise). However, when going to ISO 1600, I get an image slightly darker than expected. (The RAW is darker, the jpg gets brightened to nearly the correct level.) As far as I can tell, ISO 1600 is somewhere over ISO 800, but under ISO 1600. Maybe about ISO 1200... who knows.
« Last Edit: 31 / December / 2011, 05:28:57 by Mr_Speedy »
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