Eos 400d ( Rebel XTI )

drpr0

First of all, thanks for the answer.

I am trying describe:
I have languages.ini - i put this file on my flash, a switch 2 the Russian lng, but i see some non-translated string.

I am try add this string in 2 languages.ini with translation (for example AUTO ISO = My Russian text), write this new languages.ini to the flash, but i cant see translation in my camera.

Pls, says where is my errors. Thanks one more, and sorry for my bad English.

0xAF

drpr0
First of all, thanks for the answer.

I am trying describe:
I have languages.ini - i put this file on my flash, a switch 2 the Russian lng, but i see some non-translated string.

I am try add this string in 2 languages.ini with translation (for example AUTO ISO = My Russian text), write this new languages.ini to the flash, but i cant see translation in my camera.

Pls, says where is my errors. Thanks one more, and sorry for my bad English.

please check the translators guide: http://code.google.com/p/400plus/wiki/TranslatorsGuide
if you still have problems write me a PM, i will help you.

Mirfak

A couple of comments on r796 - "AutoISO explained" that should be documented, based on my observations.

1) You must set Max AV at most just above the maximum aperture of the lens that you're using. For example, if your lens is F4.0-F5.6, Max AV number should be set no lower than 4.5. Otherwise, AutoISO will not function in TV mode.

2) If safety shift is enabled, to maintain correct exposure in AV mode, the shutter speed could drop below Min TV if Max ISO is exceeded.

eduperez

Mirfak
A couple of comments on r796 - "AutoISO explained" that should be documented, based on my observations.

1) You must set Max AV at most just above the maximum aperture of the lens that you're using. For example, if your lens is F4.0-F5.6, Max AV number should be set no lower than 4.5. Otherwise, AutoISO will not function in TV mode.

2) If safety shift is enabled, to maintain correct exposure in AV mode, the shutter speed could drop below Min TV if Max ISO is exceeded.

Changes applied; many thanks!

eduperez

Release 20110904-0 is out:

AutoISO.
Intermediate ISOs reworked: 1/8 EV resolution, false ISO-3200 removed.
Translations saved in a separate INI file (please, see the translators' guide if you are willing to collaborate).
All three possible file formats (JPEG, RAW, RAW+JPEG) available in AUTO modes.
New shortcut: color temperature.
Rolling menus.
Debug on power-on and log file mode selection.

As always, the links are:

A Word of Warning (that everybody should read) at http://code.google.com/p/400plus/wiki/AWordOfWarning.
Source at http://400plus.googlecode.com/files/400plus-20110904-0.src.zip.
Binary at http://400plus.googlecode.com/files/400plus-20110904-0.bin.zip.
Updated user guide at http://code.google.com/p/400plus/wiki/UserGuide.
There are also Spanish, Italian, and German translations (still not updated to the latest version, however).

Thanks to everybody involved!

nxb

Neato... AutoISO goes to 3000 in manual mode... Max ISO is still stuck at 1600 in the settings menu and only goes to 1600 in TV/P/AV. I shoot manual lots of the time so hopefully its not a bug and stays.

eduperez

nxb
Neato... AutoISO goes to 3000 in manual mode... Max ISO is still stuck at 1600 in the settings menu and only goes to 1600 in TV/P/AV. I shoot manual lots of the time so hopefully its not a bug and stays.

Not a bug, but a feature: AutoISO only uses real ISO values for P, Tv, and Av modes; please, see http://code.google.com/p/400plus/issues/detail?id=124 for more info.

eduperez

eliz
very happy to see AUTOISO function back.
I remember this thread was made by someone who wanted this future on his 400D. this seems to be the third serious try to make Autoiso. I tested the older version before (made by sergei), but it had problems. not working corectly (sometime the iso do not change) and it was to slow.

this third try seems the best. it's working fast, and it works correctly, so a BIG CONGRATULATION to eduperez for that. however a simple like this Autoiso is no better then a camera in Auto mode.

I WILL GIVE YOU SOME HINTS IN IMPLEMENTING A GOOD AUTOISO

You need to have some control over it to make it helpful for advanced users:
1) the possibility to set a maximum ISO for autoiso (like Nikon dslr have, and Canon 60D have)
2) the possibility to use only full stops ISO for autoiso.
the problem with xD, xxD, xxxD Canon cameras is that intermediary ISO is not by made hardware amplification. So Read Noise (Blackframe Noise) is bigger on ISO125 compared to ISO200. On ISO 160 Read Noise is smaller then on ISO100 but you lose dynamic range. So from my point of view is not a good idea to use intermediary ISO
see this http://forums.dpreview.com/forums/read.asp?forum=1019&message=19721647
Also on the 1Dx series is not a good idea to use intermediary ISO. Even they make those using hardware amplification, they use a second amplifier to make those iso. So on intermediary ISO's you have primary + secondary amplifier noise.
see this http://www.openphotographyforums.com/forums/showthread.php?t=4771
Only Nikon use hardware amplification on the intermediary ISO, and they use a single amplifier. So there you have no bad points on using them.

Also to make the Autoiso usable in different modes you have to put some limits in exposure parameters:
1) in Av mode you must be able to set a maximum exposure time (like Nikon have, or Canon 1DmIII, 1DmIV).
It is a bad idea to use a fixed exposure time as the limit to change iso (like Canon 40D, 50D have), because different focal lengths require different exposure time for obtaining unmoved images. Even linking the maximum exposure time to focal lengt of the lens (like 5DmII,7D,60D have) not think is a good idea, because for example maybe you want to shot a moving object in fast change lightning . So is a better idea to set this maximum exposure time manually.
2) in Tv mode you must be able to set a maximum aperture opening (like Canon 1DmIII, 1DmIV have)
For example you may not want to let camera chose F2.8 or F4 when shooting on macrophotography
3) in M mode you must be able to set exposure compensation (like Nikon have)
Letting the camera chose all exposure parameters is not a god idea because it can overexpose or underexpose.

Now that he have a documented release with AutoISO, which (I hope) addresses all the issues you pointed out, I would like to read your opinion on how we are doing. I am still a bit hesitant about M mode and intermediate ISOs: this is the only mode that uses them, for the reasons you explained, but I do not know how else we can avoid over / under exposures. Many thanks.

I am asking specifically you because you showed interest and knowledge in this subject, but obviously any opinion is welcome.

andrew_sj

Hello, I am working on an ISO noise reduction plugin for gimp with the 400d in mind as that is what I have. I would like to first characterise the noise across the CCD. To do this ideally what I want to do is:

1. lock the mirror up
2. take a bunch of photos (10 ish) for the ISO and time I've set.
3. put the mirror back down.

It is essential that the camera doesn't move for my image processing needs hence the mirror operation. What would be the best way of doing this?

On another note I am interested in contributing to the code base as I am a professional C/C++ coder for embedded systems and love the work you guys are doing. Am just setting up a build machine this week.

Thanks for any input

eduperez

andrew_sj
Hello, I am working on an ISO noise reduction plugin for gimp with the 400d in mind as that is what I have. I would like to first characterise the noise across the CCD. To do this ideally what I want to do is:

1. lock the mirror up
2. take a bunch of photos (10 ish) for the ISO and time I've set.
3. put the mirror back down.

It is essential that the camera doesn't move for my image processing needs hence the mirror operation. What would be the best way of doing this?

I am afraid that we still do not know how to control the mirror, so it is not possible to keep it up after the first shot.

andrew_sj
On another note I am interested in contributing to the code base as I am a professional C/C++ coder for embedded systems and love the work you guys are doing. Am just setting up a build machine this week.

Thanks for any input

Welcome abroad!

a1ex

If you find out how to control the mirror, I'm interested too 😀

andrew_sj

Ok, thanks for the reply. Could someone either point me to a resource or explain to me how the hack works. I understand that the hack sits on the CF and doesn't modify the firmware but I don't know what it contains or how it works. I'm pretty good at reverse engineering so I'll start work on the mirror control by decrypting the canon firmware and decompiling it the best I can.

Does anyone know the extent to which the symbol table is populated in the canon firmware? thanks

eduperez

andrew_sj
Ok, thanks for the reply. Could someone either point me to a resource or explain to me how the hack works. I understand that the hack sits on the CF and doesn't modify the firmware but I don't know what it contains or how it works. I'm pretty good at reverse engineering so I'll start work on the mirror control by decrypting the canon firmware and decompiling it the best I can.

Does anyone know the extent to which the symbol table is populated in the canon firmware? thanks

I am probably not the best person to explain this, but I will try (0xAF will surely correct my mistakes): Basically, when the camera starts up, it executes "start" at "entry.S", which passes the control to "my_romStart" at "init.c"; from there, we replicate all the initialization stuff from the original firmware, but with some subtle changes to plug-in our code.

0xAF

andrew_sj
Ok, thanks for the reply. Could someone either point me to a resource or explain to me how the hack works. I understand that the hack sits on the CF and doesn't modify the firmware but I don't know what it contains or how it works. I'm pretty good at reverse engineering so I'll start work on the mirror control by decrypting the canon firmware and decompiling it the best I can.

Does anyone know the extent to which the symbol table is populated in the canon firmware? thanks

hi Andrew, it's good to have more embedded devs arround. Please check your PM I'll send mine contacts, so we can have a more real-time conversation.

andrew_sj

I'm now on the hunt for tools. Anyone got anything useful please let me know as would it would get me up to speed much quicker. Also any scripts etc would be useful.

Cheers

0xAF

andrew_sj
I'm now on the hunt for tools. Anyone got anything useful please let me know as would it would get me up to speed much quicker. Also any scripts etc would be useful.

Cheers

perhaps you should talk with alex, he can help you with tools...
btw when you start digging, i can help you with the basics of the FW, so you get on the track fastly.

eduperez

andrew_sj
I'm now on the hunt for tools. Anyone got anything useful please let me know as would it would get me up to speed much quicker. Also any scripts etc would be useful.

Cheers

I cannot help you with that: I only do development, and have never done any reverse-engineering.

a1ex

For reverse engineering I wrote (and use) this script: https://github.com/alexdu/ARM-console

http://magiclantern.wikia.com/wiki/GPL_Tools/ARM_console
some tricks: http://magiclantern.wikia.com/wiki/ARM-console_Tips_by_Alex
how to setup: http://magiclantern.wikia.com/wiki/Magic_Lantern_Development_on_Mac
theory: http://magiclantern.wikia.com/wiki/IDAPython

But these scripts were written for DryOs cameras, which use a different compiler. They will find 400D code a bit difficult; importing a good IDC with functions properly defined will help a lot.

north_wind_rus

Attention! Developers' alternative firmware ", translated into Russian, includes a large number of spelling errors and incorrect technical parameters translated into Russian.
Remove from nightly builds of the Russian language ...

P.s At this point I can offer an alternative translation into Russian, but it is 80% and I will be presented next week only ...

0xAF

ok, thanks for the report...

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