PowerShot SX220 HS - Porting Thread - page 48 - General Discussion and Assistance - CHDK Forum

PowerShot SX220 HS - Porting Thread

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Offline reyalp

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Re: PowerShot SX220 HS - Porting Thread
« Reply #470 on: 05 / February / 2012, 15:24:27 »
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In the past I used speeds up to 1/40000 (freezing action with flash in black environment). So in my experience, there is a difference between 1/3200 & 1/10000 or 1/20000.
If you are using flash as your only illumination, the camera shutter speed is basically irrelevant. Flash is very very fast.

These high shutters speeds are of very limited use, there's few scenes with enough light and few things that move fast enough to matter. The intersection is very small...

How did you determine the max shutter speed? The EXIF data doesn't get updated below 1/3200s. According to my tests by looking at the histograms the fastest shutter speed is about 1/25600s.
The Canon maker note is more likely to reflect the actual override speed, although that doesn't provide evidence that it actually worked... only comparing the actual image values can doe that.
Don't forget what the H stands for.

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Offline lpf

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Re: PowerShot SX220 HS - Porting Thread
« Reply #471 on: 08 / February / 2012, 14:43:16 »
How did you determine the max shutter speed? The EXIF data doesn't get updated below 1/3200s. According to my tests by looking at the histograms the fastest shutter speed is about 1/25600s.

Assuming that you 're taking a picture of a bulb, with F8 & 1/2500. This will give a result. With F11 & 1/1250 will give the same. With F8 and 1/5000 the result will be 1 stop darker and with 1/10000 2 stops darker. Sorry but these are basics. So what is the reason to see EXIF when you are able to see the picture?
My tests prove that any override setting faster than SX220's fastest shutter speed gives the same optical result, 1/3200.
When I used EXIFTOOL found this number: 1/3228.
Please, how do you inspect the histograms? Using Adobe Bridge?

As found in the CHDK pages other (mainly older Powershots) can really shoot fast. I hope that a solution can be found in the future.
Thanks.

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Offline reyalp

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Re: PowerShot SX220 HS - Porting Thread
« Reply #472 on: 09 / February / 2012, 01:46:17 »
My tests prove that any override setting faster than SX220's fastest shutter speed gives the same optical result, 1/3200.
On some cameras (starting around the SX10, IIRC), this would happen if the CHDK port does not implement exp_drv_task (extra long exposure support, but this also enables faster exposures on some cams)

However, looking at the source, this appears to be implemented. Perhaps it's not done correctly, or canon has changed things again.

Don't forget what the H stands for.

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Offline msl

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Re: PowerShot SX220 HS - Porting Thread
« Reply #473 on: 09 / February / 2012, 05:52:45 »
My tests prove that any override setting faster than SX220's fastest shutter speed gives the same optical result, 1/3200.

Works fine for me (FW 1.01a). My test environment: Av mode F4.0, ISO3200, Tv overrides 1/3200, 1/4000, 1/5000, 1/6400. I can see differences in the canon histogram & in the brightness of the pictures.

But maybe there is a problem in Tv override function for the FW 1.01b (= 1.01c). In German CHDK forum was reported, that long exposure times (>15s) with FW 1.01c not work. It would be nice if funnel could check this.

msl
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Offline lpf

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Re: PowerShot SX220 HS - Porting Thread
« Reply #474 on: 09 / February / 2012, 14:46:47 »
It definitely works up to 128 seconds as my tests show. Here are some attachments. The photos taken on a table, with an 100W ceiling lamp, dimmed as low as possible.
For the problem of fast shutter speeds I have rather good news, but I prefer to work a few days on it and I will post my results. Sure the CHDK works !!! it was my fault.

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Offline lpf

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Re: PowerShot SX220 HS - Porting Thread
« Reply #475 on: 10 / February / 2012, 12:43:19 »
I now can say (with my apologies) that SX220HS FW 1.01c really works fine, regarding overrides. I tested the camera from 2 minutes up to 1/100k ( I'm sure that 1/64000 is usable).
Never trust EXIF data, only your eyes.
For the moment I'm sending two photos taken with simple "hardware": One Led lenser, 200lm as main light, one dish and some drops. The results are not worthy of a prize but can show the action.

Re: PowerShot SX220 HS - Porting Thread
« Reply #476 on: 15 / February / 2012, 02:37:47 »
I managed to download the firmware of my sx220hs, 1.01C  :)
Here's the link to the file:
http://www.box.com/s/xh3da07sxyjz6403dapq


Sorry if it sounds stupid  :( . The file named [SX220HS 1.01C PRIMARY.BIN ] which i have downloaded from[http://www.box.com/s/xh3da07sxyjz6403dapq] is only a single  PRIMARY.BIN file of 16Mb .

But the latest firmware for SX220HS 1.01C at http://mighty-hoernsche.de/ is of total 5.13 mb and PRIMARY.BIN is of only 224 kb .  :o why is the difference ?? and what does it means ??
« Last Edit: 15 / February / 2012, 02:42:01 by harsh »

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Offline reyalp

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Re: PowerShot SX220 HS - Porting Thread
« Reply #477 on: 15 / February / 2012, 03:00:39 »
Sorry if it sounds stupid  :( . The file named [SX220HS 1.01C PRIMARY.BIN ] which i have downloaded from[http://www.box.com/s/xh3da07sxyjz6403dapq] is only a single  PRIMARY.BIN file of 16Mb .

But the latest firmware for SX220HS 1.01C at http://mighty-hoernsche.de/ is of total 5.13 mb and PRIMARY.BIN is of only 224 kb .  :o why is the difference ?? and what does it means ??
PRIMARY.BIN is a dump of the original Canon firmware. The stuff files on http://mighty-hoernsche.de/ are CHDK builds.

These are two completely different things.
Don't forget what the H stands for.


Slow burst when CHDK enabled
« Reply #478 on: 06 / March / 2012, 15:05:30 »
I am experiencing a performance issue when the camera is set to burst mode and CHDK is loaded. With the same card the "native" (CHDK not loaded) burst mode is twice as fast as when CHDK is active. I have RAW mode disabled and I've tried different settings including disabling overrides. There is still something going on every time the camera takes picture, perhaps some background process that slows the things significantly. Can some one comment on this and perhaps suggest a solution?

Thanks,
Nick

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Offline philmoz

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Re: PowerShot SX220 HS - Porting Thread
« Reply #479 on: 06 / March / 2012, 15:21:56 »
I am experiencing a performance issue when the camera is set to burst mode and CHDK is loaded. With the same card the "native" (CHDK not loaded) burst mode is twice as fast as when CHDK is active. I have RAW mode disabled and I've tried different settings including disabling overrides. There is still something going on every time the camera takes picture, perhaps some background process that slows the things significantly. Can some one comment on this and perhaps suggest a solution?

Thanks,
Nick

Are you using the latest version?
There was a recent change that fixed this for the SX40, and may help with the SX220 as well.

Phil.
CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)
  g7x2 (1.01a, 1.01b, 1.10b)

 

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