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

hotvedt

Maybe you could write in your native language, then someone could help translate....?

fe50

h-v-n
I am sorry for my English 😳
I ask to place files of an CHDK :😀

No problem, good work ! 😀

Nice - you have coded the long exposure feature for the A630 1.00c and now you want to add this to the trunk (= the official CHDK source code)...

To add things to the trunk, normally a diff file is posted at the CHDK Bugtracker, then a developer with write-access to the SVN will verify and integrate it.

But - the Bugtracker has some problems at the moment, file uploading is not possible...

Attached to this post i have added h-v-n's code as DIFF file against trunk #786,
maybe one of our developers could check it in 😎

reyalp

Committed. Thanks h-v-n and fe50.

ewavr

It seems that changes in boot.c are unnecessary, because A630 is VxWorks camera.

reyalp

ewavr
It seems that changes in boot.c are unnecessary, because A630 is VxWorks camera.

Ooops, quite right. Reverted.

McArti

Hi!

I have A650
Set 10*10 and TV is 64sek
With #788 long exposure don't work.

ps. I hope so Yet 😀

reyalp

McArti
Hi!

I have A650
Set 10*10 and TV is 64sek
With #788 long exposure don't work.

ps. I hope so Yet 😀

Extra long exposure is not implemented on A650 yet.

fe50

Here's a list of all cameras with the long exposure feature: [tt]http://chdk.wikia.com/wiki/User:Fe50#long_exposures[/tt]

an0n

fe50
Here's a list of all cameras with the long exposure feature: [tt]http://chdk.wikia.com/wiki/User:Fe50#long_exposures[/tt]

Thaannkkyou ! have been waiting for that. (For user guide).
Will some nice developer do it for A720, please. 😁

yvesson

Hej,
Here are 3 shots with my A540 :

159s, noise reduction on.

1024s, noise réduction on (argh 34 minutes to wait).

1024, no noise reduction.

mngc

Some questions, i try generate a master dark and the master flat to process the long exposures pictures.
How many gray depth bit in raw file? 8-10-12-14? And this camera what type CCD used? Datasheet for CCD available? For example, real size of one ccd pixel in micrometers?

vostok

The bit depth of compact raw files is normally 10 bits. Don't have information on pixel size or the sensor make available. What are these needed for?

reyalp

vostok
The bit depth of compact raw files is normally 10 bits. Don't have information on pixel size or the sensor make available. What are these needed for?

Newer cameras are 12 bpp, although the actual precision appears to still be 10 bits.

mngc

This parameters requied for astro photography. I create a flat field, for correct vignetting and dust or pixel intesity problem. The best flat filed picture average intesity is half per full expusured pixel. But requied the raw pixel information, the own camera processed image file not same instensty. For example, canon EOS 350d has a 14bit = 4096max., some astronomical processing software save this in 16bit, but only 0-4095 informative. For this (EOS) camera the best raw average intensity is 2048.

CHDK has a function to found statistic information for raw picture?

Pixel size is important to astro photography, lots of program use this paramater. For example, with real focus lenght with REAL pixel size, the resolution in arcsec, easy find. And the field of view too, horizontal, vertical, and full. The sensor size not too good, normal CCD has specially used pixel, etc. but the sensor size in mm?

vostok
The bit depth of compact raw files is normally 10 bits. Don't have information on pixel size or the sensor make available. What are these needed for?

mngc

reyalp
Newer cameras are 12 bpp, although the actual precision appears to still be 10 bits.

I confused. For a590is 10bit raw is correct? Or use 12 or 16? bit file format, with 10bit real pixel information?

Very good, free, but very difficult program (mostly command line) to process astro images.
http://www.astrosurf.com/buil/us/iris/iris.htm

Graphical alternative, free, easy, but the result not the best.
http://deepskystacker.free.fr/english/index.html

Booth program used own(or adopted) raw converter, to best result. Raw conversion important to picture quality.

reyalp

mngc
I confused. For a590is 10bit raw is correct? Or use 12 or 16? bit file format, with 10bit real pixel information?

The a590 is 10bpp. You can find this information in the CHDK source http://tools.assembla.com/chdk/browser/trunk/include/camera.h

RaduP

Well, I tried the extra long exposure on my A570is last night, full moon and stuff.
Here is a 256 seconds exposure: Moonlit flowers
And a 645 seconds one: Moonlit flowers

So thanks everyone who added this, it's a really great feature, and I wonder why Canon didn't add it in the first place.

RaduP

Ok, I think I found a bug :/
On my a570is, for really long exposures (over 2700 seconds, possibly less) the camera will freeze with a blank screen. No buttons work, including the power button.
Can someone please confirm this?

yvesson

Hej,
I havn't tested more than 1024s on A540, which was already 34 mins of work for my poor sensor, I guess pushing it too far might be a problem for the batteries or for the sensor heat.
And really, the picture is crappy enough at 1024s.

fudgey

RaduP
Ok, I think I found a bug :/
On my a570is, for really long exposures (over 2700 seconds, possibly less) the camera will freeze with a blank screen. No buttons work, including the power button.
Can someone please confirm this?

The longest I've tried on my a570 100e was 1200 s (20 minute exposure + 20 minute dark frame). It worked fine.

You've probably just hit a limit, not a bug. It may or may not be possible to get past that one too if you find out why it freezes, and it could be that it doesn't always freeze... But when does it freeze? I didn't try waiting for this, but at least a 2800 second exposure seems to start fine on my cam. The only button that works during exposure is the battery lid detect switch...if your camera beeps when you touch it, it probably hasn't crashed totally.

(btw, fw version matters a lot in potential bugs considering extra long exposures because each version needs their own asm hack copy pasted from disassembly).

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