extra long exposures (split from: Hardcore modding on a A530, thanks to CHDK!

mattkime

i'm interested in getting extra long exposures working on the a650. it was stated that one needs to know asm to be able to add it. i don't know asm but i'll do whatever i can to help implement the feature, including learning asm if someone can guide me through it. (long shot, i know)

fudgey

A completely untested a650 beta build (I don't have access to an a650) of trunk 766 with extra long exposures can be found here: http://www.zshare.net/download/60731683297146b4/. A diff against svn trunk 766 included.

I can't begin to tell how unsure I am about what happens if you try it, so if your camera is financially crucial to you, wait until someone else does (probably just the usual i.e. it either works or crashes in a way that shuts down the camera with the lens out whenever you attempt to shoot, requiring reboot or even removal of batteries...but don't shoot me if it performs worse than that).

Please test both extra long exposure override, short exposure override, shooting without overrides and also continuous mode shooting.

mattkime

unfortunately it might take me a little while to get to this. i'm about to deploy my two a650s and due to a lack of work i probably won't be buying any to replace them, well, until i relent.

ravelithium

ewavr

I was wondering if there's a chance that an extended exposure time for the A560 (ver FW: 100a) might be available soon. Thank you a lot ^^
Regards

ravel
atual work with 65s: http://ravelithium.deviantart.com/

reyalp

I've added extra long exposure for a540 in svn 771. Only tested briefly, seems to work.

yvesson

Hej,
Good reyalp, I'll test that soon. Thanks.

mngc

Hi,

@reyalp

My camera is a590is fw 1.0.b. Possibly add support for extra long exposure? Thank.
Very interesting feature for me.

Lajos

yvesson

Hej,
Tryed 256s with dark frame substraction, looks kinda clean to me, apart from some dark line middle left of pic.
Tryed also 101s without dark frame, there is millions of hot pixels (expected) but it works fine, good job reyalp.

reyalp

ravelithium
ewavr

I was wondering if there's a chance that an extended exposure time for the A560 (ver FW: 100a) might be available soon. Thank you a lot ^^
Regards

ravel
atual work with 65s: http://ravelithium.deviantart.com/

edit re-uploaded at 2:37 GMT, first build didn't have long exposure turned on in camera.h :'(

Please try the test build at http://www.zshare.net/download/61084765bf7782bd/
If it works, I'll commit.

reyalp

mngc
Hi,

@reyalp

My camera is a590is fw 1.0.b. Possibly add support for extra long exposure? Thank.
Very interesting feature for me.

Lajos

Here's a test build for a590 101b http://www.zshare.net/download/61089350b8fe3c25/

mngc

Many thanks, reyalp. Now downloaded it. I will test it, and i report back.

Currently i working some test and building external power supply for this camera.
The adapter plug is 2,35/0,75mm (not 2,5mm!). Center pin positive. I use simple test,
now the camera is running from laboratory power supply. CHDK show the voltage same with
the power supply voltage. Original Canon power supply output is 3.15V, i think this is absoulute maximum rating.
(equal two fresh AA cell voltage). Do not use any unstabilized, cheap adaptor, possibly kill the camera (this adaptors with low load, the output voltage very high). And check polarity twice. Any high quality 3 volt 2-3 amper stabilized adapter useful. I will build external battery pack with two D size alkaline battery or accu. Some measurements coming soon, for example, how many current required for playback, record, flash, etc.

Lajos

reyalp

Here's a test build for a590 101b http://www.zshare.net/download/61089350b8fe3c25/
[/quote]

reyalp

Here's a test build for a590 100e http://www.zshare.net/download/6112796249102371/

mngc

@reyalp

Now tested this chdk http://www.zshare.net/download/61089350b8fe3c25/ on a590is fw 1.0.1b.
I not have 1.00e firmware camera, cannot test.

Now override menu exposure time selectable 2048sec - 1/100K.

- I try record 16 sec image, OK.
- 64 sec time is OK, and image is OK, i see visual difference with 16sec
- 80 sec time, not ok, real time approx. 64 sec only, picture visually same as "normal" 64sec
- 128 sec time, not ok, real time approx. 64 sec only, picture visually same as "normal" 64sec
- 2048 sec time, not ok, real time approx. 64 sec only, picture visually same as "normal" 64sec
- i try Shutterspeed enum type switch to factor, and set it to 500 * 1 sec. not ok, real time approx. 64 sec only, picture visually same as "normal" 64sec

I try disable dark frame subtraction, this is ok, not record the dark frame, and i see visual difference in image.

Any help are welcome, and of course i test it.

reyalp

mngc
@reyalp

Now tested this chdk http://www.zshare.net/download/61089350b8fe3c25/ on a590is fw 1.0.1b.
I not have 1.00e firmware camera, cannot test.

Understood, but all sub versions have to be implemented. The switch in camera.h is per camera, not per sub.

try http://www.zshare.net/download/61131483fe8c5c4a/

edit:
trying a 128 and a 60 second exposure should be enough.

mngc

Now test the latest testbuild (Build date jun 8 2009, 22:37:55)

- 64 sec ok
- 128 sec not ok, recording time only 64 sec.

reyalp

mngc
Now test the latest testbuild (Build date jun 8 2009, 22:37:55)

- 64 sec ok
- 128 sec not ok, recording time only 64 sec.

One more http://www.zshare.net/download/6113394740c3e551/

mngc

reyalp

One more http://www.zshare.net/download/6113394740c3e551/

Now test this version of chdk. Wow! Working. This is a simple fast test, 64s ok, 128s ok. I will test more later, now the Sun too bright, i waiting for night...
Big thank you, reyalp!

reyalp

mngc
Now test this version of chdk. Wow! Working. This is a simple fast test, 64s ok, 128s ok. I will test more later, now the Sun too bright, i waiting for night...

Great 😀

Updated 100e http://www.zshare.net/download/611367101837b12c/

3belas

confirmed!
64 sec ok
128 sec ok
*aperture override=16. The A590IS hardware aperture limit is 11 if i'm not mistaken.

I will try more (with longer shutter speed) later. The processing time is very long though.

3belas

update : 512 sec is working.

i wonder how long actually it can go and whether is save or not to use it

« Previous Page Next Page »