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It is not that easy, we did some tests in the past but the speed was not increasing. Maybe different registers or something totally different for digic 4, but it is not just an easy port...

Thank you for the info, can you tell me more?
Which camera
What kind of test?

Thank you Bilal for the infos,
So let say that if i take the source of sd_uhs.mo and compile it for 600D in Lua_fix and launch the module on my 600D i can give some more information to someone interested in investigate this ? Or make some test on the camera?
Because all i know is how to compile a module....right now.

Of course i understand all the effort that dev put in ML in those almost 15 years.  ;-)
Also that lot of time is spent on newer cpu waiting for a ML usable release.

I'm just thinking if some devs are still working on old cameras... Because now are extremely cheap and still usable for many uses. But unfortunately have the worst speed in R/W.
I know there are some effort to mantain ML usable on every model... For this reason i was asking.
An thank you so much for any answer.

Hi everyone,
i would like to ask how many people are interested in porting sd overclock to Digic 4 cameras.

There are many popular cameras in this group like 500D 550D 600D 60D 50d 5D2 1100D.
Personally i own a 600D and will be very happy to improve the R/W speed of the camera (i.e.for video recording)
Unfortunately i cannot help due my zero level in programming, but i tink that some developer can find a better motivation if the interest was very high.
I've read a Bilal's comment about a maybe not so difficult porting a part of his work for Digic 5 to Digic 4 .
Maybe someone is interested?

Finally build astro.mo for 600D and branch lua_fix.
Copied in module directory in my sd card and it works!

The module, once activated, create 3 new lines in the bottom of focus menu:
Star focus
Polar alignment
Color scheme

Once selected, with the Q button you can choose different settings...

Star focus: to accurately adjust your focus to the star.
You have 3 settings:
Mode: 2 options: 0...255(RGB) or RAW
Star thresold: with right arrow (fine settings) 1 to 10%, with left arrow (coarse setting)  change troggle between actual setting and 15% (max value).
Background level: from 1 to 70% (default 60%). The percentage of false pixels on LV screen during measurement.

Polar alignment: to help you to polar align your equatorial mount. Must have aligned you field of view on LV screen before.
You have 2 settings:
Hemisphere: Nothern/ Southern  (choose according to the Hemisphere you are)
Tutorials: on/off (Guide you to the process with messages)

Color scheme: you can choose from Dark red (useful in the night to keep eye adapted to low light,  because red light don't interact with eyes as other wavelenght) and Default (back to your normal color scheme). Warning: the first time you select this menu it will change automatically to dark red, go to a dark room to see how to switch to default.

How to use: (theoretically, i still have check in progress)

Set up your tripod, mount, telescope and camera on field (i assume you work with the camera mounted on the telescope), make a 2 star alignment.

Point on a bright star near the target you want to shoot. I.e. if you want to shoot to M42 choose one star of Orion's belt. Made a manual focusing

Next align your field of view with the Right Ascension mouvement of your mount (RA): Put a cropmark or a grid in the screen and check that moving your RA , the star is at the same distance from grid line in both end of the screen, if not adjust the camera angle accordingly (rotating T2 adapter).

Then activate Polar alignment and follow instructions (of course you know what is polar alignment). When aligned your setup switch off and set your focus 

Activate star focus and adjust manually your focus. On LV screen you have a circle on the center and a bar in bottom left. Move the circle on the star and focus for minimum bar level. Zoom focus must be disabled. Disable starfocus when done.

Done. Move the mount to the target for starting your photo session.

Hope this help someone interested in.... (my 2 cents because i am 0 in programming skills).
To the dev i can said that this module works in 500D 550D and 600D. Works in 40D with a little mod.
Thanks to names_are_hard and kitor who adviced me.

Downloaded and extracted a tar file with branch lua_fix in my home dir/magic-lantern-branch-lua_fix
go to platform/600D.102
run make zip
compiling stopped with:
arm-none-eabi-ld: shoot.o:/home/luca/magic-lantern-branch-lua_fix/platform/600D.102/../../src/shoot.c:1857: multiple definition of `wb_kelvin_ph'; lens.o:/home/luca/magic-lantern-branch-lua_fix/platform/600D.102/../../src/lens.c:1623: first defined here
make: *** [../../src/Makefile.src:203: magiclantern] Error 1

how to solve the error?

I find what seems an uptaded version with some additional work here:
https://github.com/jmheder 
The file vxworks_1.0.6.zip contains all the last revision.Before i tried to copy astro.mo in my sd card, but not worked because

compared the two versions, the more recent just have a small difference needed for eos 40d, the code is almost the same

If you think it's not viable, i will be more than happy if you can help me in setting up my machine for compiling... I have read one how to but i haven't clear how to install the gcc arm compiler, transfer the branch experimental-lua-fix in local etc.
Or i can compile directly on github?

I find what seems an uptaded version with some additional work here:
https://github.com/jmheder 
The file vxworks_1.0.6.zip contains all the last revision.Before i tried to copy astro.mo in my sd card, but not worked because oldAPI. Then downloaded the sources... Now i am asking a little help to compiling the module. I don't have yet an environment for compiling. I have a fresh ubuntu pc to start with or if you can share with me the one youhave compiled i will appreciate so much.

i put the source here https://drive.google.com/drive/folders/1F0cnV0nM8mzl2re2F6MQVKtqWSUAnTLv?usp=share_link
Maybe can you help me in compiling just the module for experimental lua-fix build?

Also the astro module compiled for 40d don't work showing old api . Keep researching one correct for 600d.

Hi Andrea, are you still working on astro.mo?
Ciao

Done some research.
Copied astro.mo in my module folder and loaded. As expected ML tells old API so the module don't work.
But find that some recent build have astro.mo , if i remember well the  minimal build  for 40d in Github.
It's compiled for another model but maybe if i extract the module alone it work on my camera (40d is digic 4 also?)

I agree, just from my newbye point of view was something that wort to mention.
I will continue to investigate and learn functions of the  experimental-lua-fix.
Also interested in learning how to set up an environement for compiling for my 600d.
I am interested in astro.mo module, but will write in the right thread.
Nice to see such activity in ML project... wonderful!

I finish now to read posts about crds and supported video res for different eos series cam. It appears clear that 600d has limits and 720p is the max this cam can afford.
I recorded clearly with an unsupported mode, so the cam crashed.
Thanks to all for the help.

I think will be useful for me reading the post aboud cards, i remember to have seen something in the forum...
All cards i have are micro sd except an old 1 gb sd card.

Opened in a windows pc (was unable to open in Buster, strange, it tell me it's codified with a not compatible format)
it's quite long , will upload in opened bug in heptapod.
I think it's a problem of writing speed on sd maybe. I'm using a Lexar 128 gb c10 3 1066.
Not repeated yet the same sequence of actions.
Started recording, The recording was stopping after 3 sec then i was pressing LV button again, stopped after 3 sec, again LV button and so on for several times until crashed.
Maybe in the log is more detailed...

yes, is mine.
this is crash00.log
ASSERT: 0
at Evf\EvfState.c:1190, Evf:ff0fa98c
lv:1 mode:20

Evf stack: 132f20 [133048-132448]
0xUNKNOWN  @ ff07e414:133040
0xUNKNOWN  @ ff1fbb10:133018
0xFF1FB56C @ ff032a3c:133000
0xUNKNOWN  @ ff1fb59c:132ff0
0xUNKNOWN  @ ca1490:132fc8
0xUNKNOWN  @ ff1fb624:132fa8
0xFF0142FC @ ff0fa988:132f58
0x00C70478 @ c70b74:132f20

Magic Lantern version : lua_fix.2020Dec28.600D102
Mercurial changeset   : 7e5067c0a8cf (lua_fix) tip
Built on 2020-12-28 18:19:56 UTC by jenkins@nightly.
Free Memory  : 259K + 977K

hope this can interest someone, there is also another file log00.log with the same timestamp that i cannot open.

Experimental lua.fix 2020.
Also find how to log in heptapod and upload files.

I would like to ask where i can upload the log for a crash ending with error 70 in my 600d. I was using mlv  module and various setting i.e. fps override. If i go to bug report i am redirected and cannot upload photos.
Thank you.

Veramente illuminante!
I 'm thinking if still valid after all those years....

Thanks to everyone that replied. I already joined Discord, will try to find useful info there...
I am pretty new with ml, and with my 600D (bought second hand for make astrophotograpy) so i have to start from 0.
I learned a lot in these days but still have a long journey to do...
I am a little confused with the quantity of infos spread in all threads, anyway because i have some experience in photography, electronics, linux and computer, i learn fast.
I think the next step is to decide what is the correct ml version for me and then learn how to compile it for my 600d to maximize personalization with modules and scripts.
At the moment i tried a old stable and then switched to the experimental lua_fix from 2020, both working perfect, of course the second with lot of functions....
So will ask in discord (with the name pharmaweb) what i need for compiling and where to find sources.
If someone need a 600d user for testing I am here....

Hi Andrea,
Can you help me compiling astro module for my 600d?
I would like to test it but with my ml version experimental lua -fix. 2020 i think old astro.mo don't work.
Thanks you in advance
Luca