eos M10 port - page 28 - DryOS Development - CHDK Forum
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eos M10 port

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Offline aloniv

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Re: eos M10 port
« Reply #270 on: 20 / March / 2020, 12:46:02 »
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Can one use longer exposure times on the M10 than the original firmware provides using the TV override setting (e.g. 5 minutes)?

Are there any recommended 43mm ND filters I should consider buying for the 32mm f/1.4 lens?

Should I be worried about using fast shutter speeds on other CHDK cameras (e.g. SX200IS)?
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Offline c_joerg

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Re: eos M10 port
« Reply #271 on: 20 / March / 2020, 13:21:23 »

Quote from: srsa_4c on 20 / March / 2020, 12:11:49
The 1/4000 s limit is the Canon user interface limit (on M10, M3, also M6, etc) and likely the hardware's design limit (why would they build in a more durable shutter).
Interesting…
I just tried 1/8000s (0,00013s) on my M3 and it works. As you can see on the RAW Histogram, it’s 1EV less. I don't want to try a shorter value
Quote from: srsa_4c on 20 / March / 2020, 12:11:49
IIRC reyalp has experienced (temporary?) shutter malfunction on one of his small sensor compacts when he was shooting larger number of pictures with shorter-than-factory exposure times. It would seem that fast shutter speeds put extra strain on the shutter hardware.
Why?
I think we have to differentiate between a global closure and a focal-plane shutter. The global shutter has to be faster and faster with short exposure times, but with the focal-plane shutter only the distance between the curtains becomes smaller or?
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Offline srsa_4c

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Re: eos M10 port
« Reply #272 on: 20 / March / 2020, 15:54:20 »
Quote from: aloniv on 20 / March / 2020, 12:46:02
Can one use longer exposure times on the M10 than the original firmware provides using the TV override setting (e.g. 5 minutes)?
Yes, but I can't say what the maximum exposure time is. 5 minutes were mentioned here as working.
Quote
Should I be worried about using fast shutter speeds on other CHDK cameras (e.g. SX200IS)?
Here's the related thread.
Quote from: c_joerg on 20 / March / 2020, 13:21:23
I think we have to differentiate between a global closure and a focal-plane shutter. The global shutter has to be faster and faster with short exposure times, but with the focal-plane shutter only the distance between the curtains becomes smaller or?
OK, I have to admit I don't know the type of shutter used in this camera. In case you have more information on shutter type, or shutter speed vs shutter lifetime, that would be welcome. If greater speeds don't have adverse effects on the shutter, I might consider adding CAM_EXT_TV_RANGE.
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Offline aloniv

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Re: eos M10 port
« Reply #273 on: 21 / March / 2020, 00:56:19 »
The shutter types of M3 and M10 can be found on these pages:
https://www.canon.co.uk/cameras/eos-m3/specifications/
https://www.canon.co.uk/cameras/eos-m3/specifications/
In particular, M3 has a "Hybrid Single Blade Shutter (Electronic first curtain and mechanical second curtain shutter)" while M10 has an "Electronically controlled focal-place shutter".
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Offline aloniv

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Re: eos M10 port
« Reply #274 on: 21 / March / 2020, 01:15:58 »
Sorry didn't copy the right M10 link:
https://www.canon.co.uk/cameras/eos-m10/specifications/
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Offline aloniv

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Re: eos M10 port
« Reply #275 on: 21 / March / 2020, 01:36:01 »
According to https://blog.usro.net/canon-eos-digital-cameras-shutter-life-expectancy the shutter expectancy of M cameras (M10 isn't listed but other models are) is roughly 100,000 shots.

The post about shutter failure occurred at over 80,000 shots, so the shot number might have played a bigger role in the failure than the shutter speed.
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Offline c_joerg

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Re: eos M10 port
« Reply #276 on: 21 / March / 2020, 06:08:10 »

Quote from: srsa_4c on 20 / March / 2020, 15:54:20
OK, I have to admit I don't know the type of shutter used in this camera. In case you have more information on shutter type, or shutter speed vs shutter lifetime, that would be welcome.
So far I have understood that the focal-place shutter achieves the maximum speed with the flash synchronization time. After that, the window just gets smaller.
Quote from: srsa_4c on 20 / March / 2020, 15:54:20
If greater speeds don't have adverse effects on the shutter, I might consider adding CAM_EXT_TV_RANGE.
I don't want to give a guarantee here that nothing can happen. Canon will have reasons why it has this limitation. I think the risk is manageable and would only use the short times when absolutely necessary.
Quote from: aloniv on 21 / March / 2020, 00:56:19
In particular, M3 has a "Hybrid Single Blade Shutter (Electronic first curtain and mechanical second curtain shutter)" while M10 has an "Electronically controlled focal-place shutter".
That the first curtain is electronically is new to me. This further reduces the risk because there is only one mechanical curtain. The first curtain is then just a simple deletion of the respective sensor lines.
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Offline c_joerg

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Re: eos M10 port
« Reply #277 on: 21 / March / 2020, 11:35:15 »
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Offline aloniv

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Re: eos M10 port
« Reply #278 on: 21 / March / 2020, 12:18:19 »
Thanks for the M3 tests. I don't think I'd need faster shutter speeds than 1/8000 seconds or 1/16000 seconds for daytime shots as I'm not trying to capture waterfalls or drops of water (I just want to take regular pictures outdoors with an open aperture) so whatever you're getting from the M3 is good enough for me if it's implemented on the M10 .
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Offline srsa_4c

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Re: eos M10 port
« Reply #279 on: 21 / March / 2020, 17:53:29 »
I have enabled support for shorter exposures. I have no idea whether they are harmful or just inaccurate (as c_joerg's test shows).
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