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A1400 porting thread

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Offline waterwingz

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Re: A1400 porting thread
« Reply #90 on: 17 / May / 2015, 10:52:42 »
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Quote from: Crispy on 17 / May / 2015, 04:52:02
I've installed CHDK on a pair of A1400s and will do some experimenting. I'd like to use the manual focus option --
You probably want to experiment with this a bit.   The use of MF in scripting was greatly improved with the release of CHDK 1.3.0.  However, how well setting a MF distance from the CHDK menus works unfortunately depends a lot on the camera you are using.  In some cases you need to put the camera into its native Canon AFL mode or MF mode (if the camera actually supports MF mode) prior to using the SD override menu item.

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am I right in thinking that you need to specify the distance in mm from the lens to the subject?
Yes - although I think it's technically supposed to be from the sensor rather than the front of the lens.   I could be wrong about that - I'll see if I can find something definitive if  nobody else comments on this.

Also,  the actual setting used will likely be only an approximation.  Many cameras seem to use discrete focus steps - with the steps getting larger as the distance from the camera increases.   Given the large DOF of these little lens/sensors, this usually turns out to be an acceptable compromise.


Edit : found this reference CHDK Wiki : Calibrating the distance of the A620 where it says The 'Canon distance number' appears to be pretty close to the real distance if the distance is measured from the back of the camera and is small...
« Last Edit: 17 / May / 2015, 11:24:25 by waterwingz »
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Crispy

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Re: A1400 porting thread
« Reply #91 on: 18 / May / 2015, 05:23:12 »
Cheers, thanks for this information. Again, I guess the key to all of this is experimentation!
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Offline Crispy

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A1400 Crashes
« Reply #92 on: 09 / June / 2015, 03:26:14 »
Hi

I've managed to get both cameras up and running, but one of them has developed a very annoying habit of suddenly powering down in the middle of a shoot. They are both exactly the same model (B), running the same version of chdk, with the same chdk settings and user-added scripts (a zoom control script). One has worked without incident, the other is spontaneously powering down. Could this be a fault with the camera itself? Both were bought second-hand, so I guess this is an option.

Would it be worth resetting the faulty camera to its default settings, removing the replacing the SD card etc? It's very puzzling!
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Offline waterwingz

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Re: A1400 porting thread
« Reply #93 on: 09 / June / 2015, 11:34:04 »
How are you powering the two cameras?
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Offline Crispy

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Re: A1400 porting thread
« Reply #94 on: 09 / June / 2015, 12:59:15 »
Hi, it's two external power adapters.
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Offline waterwingz

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Re: A1400 porting thread
« Reply #95 on: 09 / June / 2015, 13:33:58 »
What happens if you swap the power supplies between the two cameras?
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Offline Crispy

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Re: A1400 porting thread
« Reply #96 on: 09 / June / 2015, 13:47:44 »
I'll give this a go
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Offline waterwingz

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Re: A1400 porting thread
« Reply #97 on: 09 / June / 2015, 13:52:44 »
Pay special attention to how well the power plug fits into the camera.  Any wobble at all can break the connection long enough to restart the camera.   A simple test is to gently wiggle the power cable back and forth near where it plugs into the camera and see what happens.
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Ported :   A1200    SD940   G10    Powershot N    G16
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Offline Crispy

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Re: A1400 porting thread
« Reply #98 on: 09 / June / 2015, 14:27:32 »
Just tried this: the problem seems to be when I use the slow zoom script; it will move forward by a few increments and then power down. However, the other camera works ok. Could it be simple wear and tear on the zoom mechanism?
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Offline waterwingz

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Re: A1400 porting thread
« Reply #99 on: 09 / June / 2015, 15:04:57 »
Quote from: Crispy on 09 / June / 2015, 14:27:32
Just tried this: the problem seems to be when I use the slow zoom script; it will move forward by a few increments and then power down. However, the other camera works ok. Could it be simple wear and tear on the zoom mechanism?
The lens might be more sticky on one camera than the other.  This will tend to load down your power supply.   What happens if you try running that script with a fresh set of batteries in the camera?
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Ported :   A1200    SD940   G10    Powershot N    G16
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