SX110IS - howto start porting - page 56 - DryOS Development

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #550 on: 02 / January / 2013, 09:15:46 »

Advertisements

Thanks, now i test the 1.1.0-2447 autobuild. Record mode zebra fully ok, tested with daylight.

Logged

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #551 on: 12 / January / 2013, 10:43:37 »

Possibly add support extra long exposure mode for sx110is fw 1.0b camera? I tested the maximum 64sec exposure, working ok, with or without dark frame subraction. I need longer time exposure. There is more in the sensor.

Logged

reyalp

14111

Re: SX110IS - howto start porting

« Reply #552 on: 12 / January / 2013, 18:07:32 »

Quote from: mngc on 12 / January / 2013, 10:43:37

Possibly add support extra long exposure mode for sx110is fw 1.0b camera? I tested the maximum 64sec exposure, working ok, with or without dark frame subraction. I need longer time exposure. There is more in the sensor.

Someone would need to implement exp_drv_task for this port. In the meantime, you might try stacking multiple 64 sec (or less) exposures.

Logged

Don't forget what the H stands for.

nafraf

1308

Re: SX110IS - howto start porting

« Reply #553 on: 15 / January / 2013, 12:12:02 »

Quote from: reyalp on 12 / January / 2013, 18:07:32

Someone would need to implement exp_drv_task for this port. In the meantime, you might try stacking multiple 64 sec (or less) exposures.

Just reporting... I implemented the exp_drv_task, I sent the file to mngc for testing.

Logged

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #554 on: 17 / January / 2013, 12:12:16 »

Good news! Nafraf test build working. The current max. succesfully exposure time is 10min 33 sec. I working on a better test and i will come back the result. I confused with some problems.

Logged

reyalp

14111

Re: SX110IS - howto start porting

« Reply #555 on: 17 / January / 2013, 17:12:58 »

Quote from: mngc on 17 / January / 2013, 12:12:16

Good news! Nafraf test build working. The current max. succesfully exposure time is 10min 33 sec. I working on a better test and i will come back the result. I confused with some problems.

While it would certainly be interesting to know when / how it fails, there isn't specific length of time that "should" work. We bypass the cameras built in limits, and you get whatever you get after that. IIRC a590 was also reported to return black images at some time before the 2048 second maximum.

edit:
Oh, maybe that was you http://chdk.setepontos.com/index.php?topic=3461.msg39265#msg39265 but I think others have also reported this

« Last Edit: 17 / January / 2013, 17:17:33 by reyalp »

Logged

Don't forget what the H stands for.

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #556 on: 20 / January / 2013, 13:32:50 »

Hi,

Yes, i was the one reporting on a590 extra long exposure mode working time test. ;-)
Now i am searching in chdk forums and whole internet. I found lots of interesting things.
I found links with and without problems extra long exposure mode.

500 sec ok, over bad (black image), camera sx10 or sx20 or sx30, I do not know
http://www.flickr.com/groups/chdk-sx10/discuss/72157623265098649/

very old (solved) 65sec ok, 66 sec wrong, interesting old bug from expert users (SX10)
(short exposured black image over 65sec)
http://chdk.setepontos.com/index.php?topic=3461.msg31815#msg31815

not long exposure comment, capture timeout? error (raw recording):
http://chdk.setepontos.com/index.php?topic=1998.msg18492#msg18492

1200 sec ok on a550
http://chdk.setepontos.com/index.php?topic=3461.msg31950#msg31950

2040 sec ok on a560
http://chdk.setepontos.com/index.php?topic=3461.msg35302#msg35302

600 sec ok on a570
http://chdk.setepontos.com/index.php?topic=3461.msg35062#msg35062

645 sec ok on a570
http://chdk.setepontos.com/index.php?topic=3461.msg39157#msg39157

1200 sec ok on s5is
http://chdk.setepontos.com/index.php?topic=3461.msg32915#msg32915

Logged

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #557 on: 20 / January / 2013, 13:48:00 »

Hi,

I found lots of intersting thing with dark frame modes. Currently we have a great working set_raw_nr function. I always use this function for my extra long exposured images. I shot all normal images without dark frame substraction. For short daylight exposure, dark frame not requied, for long exposure one dark frame useful. For extra long exposure mode, lots of dark frame required. Currently no mode for record only dark frames. My method on a590is is simple hardware mod, i use tube ring and fake filter (opaque). On sx110 this method not working. No tube ring for this camera. For example, paper black box not good enough, the internal light too bright (camera LED, for example).

I found this topic on record dark frames, control with mechanical shutter from lua script. I don't know how to adopt for my camera. If i understand properly, this script switch a shooted double image to one normal and one dark frame pictures separate. This is almost what i am looking for but the idea would be shot many normal image, and after shoot many dark frames. This is a common method on astro photography. The night is sort, time is expensive.

The dark frames record at dawn. The CCD sensor temperature is important, different normal and dark frame CCD temperature not good. This is one thing why it's not good to use very old dark frames.

the original idea, and sample lua code:
http://chdk.setepontos.com/index.php?topic=5822.0

very interesting topic, a540 camera record a normal and dark frame separate
http://chdk.setepontos.com/index.php?topic=1998.msg18450#msg18450

I attached my lua script to automatize the process, of course without dark frame mod. This is an example, lots of things not developed yet. For example, focus set to infinity, CCD temperature logging, etc...

I don't know chdk work in detail, I learn with every new problem. And I've got lots of help from expert developers and users.

astro110.lua (3.57 kB - downloaded 46 times.)

Logged

mngc

113
a590is fw 1.0.1b & sx110is fw 1.0b

Re: SX110IS - howto start porting

« Reply #558 on: 20 / January / 2013, 14:04:15 »

Hi,

Good internet page for users who are not familiar with long exposure.
Various common, not only Cannon releated CCD problems with long exposure, with lots of sample images:
http://darkerview.com/CCDProblems/CCDProblems.php

I know bigger CCD cameras for example Canon EOS series are better, and special CCD-s with cooled real 16bit A/D much better. But I would like to make the best out of the CHDK cameras.

Logged

waterwingz

12140

Re: SX110IS - howto start porting

« Reply #559 on: 20 / January / 2013, 14:57:58 »

Quote from: mngc on 20 / January / 2013, 13:48:00

I found lots of intersting thing with dark frame modes. Currently we have a great working set_raw_nr function. I always use this function for my extra long exposured images. I shot all normal images without dark frame substraction. For short daylight exposure, dark frame not requied, for long exposure one dark frame useful. For extra long exposure mode, lots of dark frame required. Currently no mode for record only dark frames. My method on a590is is simple hardware mod, i use tube ring and fake filter (opaque). On sx110 this method not working. No tube ring for this camera. For example, paper black box not good enough, the internal light too bright (camera LED, for example).

This more recent script might interest you as well : http://chdk.setepontos.com/index.php?topic=8833.msg92195#msg92195

Logged

Ported : A1200 SD940 G10 Powershot N G16