Usage Manual - General Discussion and Assistance - CHDK Forum
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Usage Manual

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Offline mazzarri

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Usage Manual
« on: 17 / April / 2012, 14:23:43 »
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Hi everyone.
Since yesterday I had a problem (now solved) I have the curiosity to understand how CHDK works in order to understand better how to act with my canon sx40 camera. Is there a kind of User Manual for CHDK?
I mean, I want to know for example "if I take a shoot with t=2s and ISO=50 what will be the aperture decided automatically by CHDK??" or "if I take a standard shoot imposing nothing, what values of ISO or shutterspeed or aperture will be decided by CHDK??" or "with CHDK everything is manual or I can go to SCN mode and EFFECTS mode without leaving CHDK??" these are only 3 questions, i have others, a kind of manual coul help if present on this site. Anybody knows where to search?
THANKS FOR YOUR GREAT WORK AND GREAT HELP!!!
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Offline outslider

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Re: Usage Manual
« Reply #1 on: 17 / April / 2012, 16:55:30 »
I suggest:
http://images3.wikia.nocookie.net/__cb20120105020429/chdk/images/6/62/CHDK_User_Quick_Start_Guide.pdf

Maybe also take a look:
http://chdk.wikia.com/wiki/CHDK_User_Manual

In general on wikia pages ( www.chdk.wikia.com ) you can find a lot of things, but some of them might be outdated. There are a lot of changes to the code now.

About your questions:
1) Canon firmware sets the aperture (in Tv or auto modes) based on Tv, ISO and scene brightness. It uses the values it knows - these which were set on Canon menus, not by CHDK. CHDK doesn't set the aperture 'automagically' unless you write a script that do so. There's no CHDK auto mode (maybe except auto ISO).

2) As above - CHDK doesn't give you any values by its own. You are responsible for setting them. Unless you have any script that do so.

3) You can use any mode, but then some CHDK-supported things might not work. On some cameras Tv/Av/ISO work only in auto manual mode. It depends on camera model and the best way is just try the thing you need.
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Offline mazzarri

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Re: Usage Manual
« Reply #2 on: 17 / April / 2012, 17:32:56 »
Really thanks, that is a clear answer. I will check the manuals you gave me. What I thought (ignorant) was that my camera takes ALL the firmware from CHDK so it is like a new camera totally depending from CHDK firmware. But you are telling me that the behaviour is another, the camera becomes only able to accept scripts so if I give her a whatever script in the <ALT> mode (for example T=60" and ISO=400) the camera plays the script and all the other variables remains the same like in a normal functioning situation... that's great so CHDK is an add-on for the camera, it is not all the firmware... but tell me, is there any dangerous situation for the lens of my camera? For example, to be honest, the situation T=4minutes and ISO= 3200 (extreme situation I know but anybody can do for joke after 3-4 beers) is a danger for my lenses or not? THANKS for your kindly response and for your time
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Offline reyalp

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Re: Usage Manual
« Reply #3 on: 17 / April / 2012, 23:17:48 »
Quote from: mazzarri on 17 / April / 2012, 17:32:56
but tell me, is there any dangerous situation for the lens of my camera? For example, to be honest, the situation T=4minutes and ISO= 3200 (extreme situation I know but anybody can do for joke after 3-4 beers) is a danger for my lenses or not? THANKS for your kindly response and for your time
There is no way anyone except possibly Canon engineers could tell you for certain. See http://chdk.wikia.com/wiki/FAQ#Q._Can_CHDK_damage_your_camera.C2.A0.3F

What we can tell you is that there are no definitively confirmed instances of CHDK destroying a camera. Given the number of people who have used it, this suggests the odds are low.
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Offline outslider

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Re: Usage Manual
« Reply #4 on: 18 / April / 2012, 02:21:40 »
BTW - 4 minutes is not really so extreme. I've shoot some pictures with tv=60 minutes (at night). It shouldn't destroy sensor unless you'd try to shoot a sun. This could burn your sensor;)

Just to note - ISO 3200 - CHDK can override Tv, Av and ISO, but in range of physical possibilities of the given camera. Although on many cameras it is possible to have Tv such as 1/20000 s and 60 min on some it's not. Av can be usually overriden not so much beyond the Canon limits (on SX130 Canon says it's 3.4-8.0, CHDK can do 3.4-11). In most cases ISO can't be set beyond Canon limits (hardware limitation).

Of course you can set the impossible values in the CHDK menu or script but the hardware will just ignore this. Just like you'd tell your camera "fly away" but I believe that camera won't do so :D
« Last Edit: 18 / April / 2012, 02:28:49 by outslider »
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Offline mazzarri

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Re: Usage Manual
« Reply #5 on: 18 / April / 2012, 15:51:18 »
Thanks everybody, that is clear. My camera has 3200 ISO as a possible value designed by CANON so that is still a good value, permitted by original manufacturer. And there is even one single case (SCN mode, night shoots) in which ISO is automatically setted by CANON to 6400. So that value is clearly possible and CHKD does not add anything. I have seen on youtube images by people who are in Astro-Photography, in effect in that case is mormal a time more than 5 minutes with ISO=1600 and f/4. I was only questioning if this can affect the sensor but in evidence the answer is NO just because I thought also that the sensor is much more affected by a normal full HD video of 1 hour... :) So thanks for your courtesy answers and for your great and free job!
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