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XTi/400D: firmware hack for spot metering, new ISO settings and new AF patterns

Marco Ristuccia , Sep 03, 2009; 02:41 p.m.

Amazing!
Starting with some CHDK knowledge they hacked the XTi/400D firmware and added the following features:

  • Spot metering

  • Intermediate and more ISO values : 80/100/125/160/200/250/320/400/500/640/800/1000/1250/1600/2000/2500/3200
    (YES, ISO 3200 is here)

  • 42 new AF pattern schemas

Tested on my 400D. IT WORKS!
They just started discovering and adding new features...

Follow the instructions and download the last build in the following link: http://chdk.setepontos.com/index.php/topic,3290.150.html

Responses

Keith Clinton , Sep 03, 2009; 03:45 p.m.

This is great, thanks!

Keith Clinton , Sep 03, 2009; 05:06 p.m.

I have to say, initial testing is very intriguing. ISO 80 & 3200 are also interesting. The spot meter is great, but i wonder what percentage its using versus the 9% of the Partial mode.

Stein Andersen , Sep 04, 2009; 03:53 a.m.

I wonder if this is safe, and reversible. Hmmm.

Keith Clinton , Sep 04, 2009; 04:14 a.m.

Yes and yes, so far I've had no trouble. And if you put in a CF card that
doesn't have the bootable MBR/ autoexec.bat file it will start up normally.

Roger Smith , Sep 04, 2009; 10:40 a.m.

Interesting. I wonder if there are any hacks for my 20D?

Marco Ristuccia , Sep 05, 2009; 08:17 a.m.

Keith,
spot metering is 3% of the center area. I think it corresponds to the little square visible around the center AF point.

Thanasis Siozos , Sep 29, 2009; 10:45 a.m.

I've installed it, works just fine, and the hack can show also the shutter actuation count (in a debug file saved in the CF card). Also the spot metering seems to be an even smaller area than the square around the central point. More like only the dot, I'd say.
Hard to believe Canon factory-crippled the camera by means of software switches.

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