various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure met

Caefix

948
Sorry, busy deleting test shots...

« on: 16 / March / 2021, 14:00:16 »

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Quote from: reyalp on 18 / January / 2019, 22:46:03

Quote from: Mlapse on 17 / January / 2019, 02:44:14
maybe I'm mistaken and it is normal for an aps-c sensor, but the log i posted a while back had tsens of over 50C, the log from a few days back still had 45C. although iso was only 200.
The interval was 30 sec, so i can't imagine that is quick enough to heat it up that much.
FWIW, I wouldn't be surprised to see >50c in warm ambient conditions with a script like rawopint. (lack of surprise should not be taken as any judgement on whether it's healthy or not )

A user reported problems around 80c https://chdk.setepontos.com/index.php?topic=13501.0 with cameras in an enclosure.

How to do shutdown / awake cam with lens kept extended?

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c_joerg

1251

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure met

« Reply #1 on: 16 / March / 2021, 14:39:50 »

Quote from: Caefix on 16 / March / 2021, 14:00:16

How to do shutdown / awake cam with lens kept extended?

1) On EOS M an interval Script with power down https://chdk.setepontos.com/index.php?topic=13956.0
2) Changing to playback mode between shoots with cancel retract timer
https://chdk.setepontos.com/index.php?topic=13737.0
3) Long exposure times and short time between shoots keeps senor temperature low.

@reyalp
Thanks, so I will try it…

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M100 100a, M3 121a, G9x II (1.00c), 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), S45,
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Caefix

948
Sorry, busy deleting test shots...

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure met

« Reply #2 on: 16 / March / 2021, 15:34:24 »

Quote from: c_joerg link=topic=12697.msg145328#msg145328
3) Long exposure times and short time between shoots keeps senor temperature low.

[/quote

Nice, in tourist´s handheld scripts it might be some microtuning to loop something like
Code: [Select]
set_iso(temp) todo() shoot() set_iso(1) sleep(...

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Caefix

948
Sorry, busy deleting test shots...

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure met

« Reply #3 on: 17 / March / 2021, 15:58:20 »

Only tested on Ixus 265, all fine there.

Code: [Select]

--[[--
@title dimmer.lua
@chdk_version 1.4
--]]--

function dimmer(tim,dim)
dim=dim or 1
tim=tim or 0
local iso=get_iso_mode()
   set_iso_mode(dim)
   press("shoot_half")
   wait_click(tim) -- or md_detect...
   release("shoot_half")
   set_iso_mode(iso)
end

dimmer()

!dimmer.lua (0.28 kB - downloaded 13 times.)

« Last Edit: 17 / March / 2021, 16:23:07 by Caefix »

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reyalp

14125

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure

« Reply #4 on: 17 / March / 2021, 16:37:19 »

I split this from the rawopint thread since it doesn't appear to be connected to that script.

I don't understand what the iso_mode manipulation is intended to accomplish.

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c_joerg

1251

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure

« Reply #5 on: 18 / March / 2021, 02:33:47 »

Quote from: reyalp on 17 / March / 2021, 16:37:19

I don't understand what the iso_mode manipulation is intended to accomplish.

Neither do I…
Maybe a darkening of the display?
However, this cannot prevent the main temperature development of the sensor.
The problem is that the sensor is constantly being read. In order to reduce the temperature increase, the reading of the sensor had to be prevented during the breaks.

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M100 100a, M3 121a, G9x II (1.00c), 2*G1x (101a,100e), S110 (103a), SX50 (100c), SX230 (101a), S45,
Flickr https://www.flickr.com/photos/136329431@N06/albums
YouTube https://www.youtube.com/channel/UCrTH0tHy9OYTVDzWIvXEMlw/videos?shelf_id=0&view=0&sort=dd

Caefix

948
Sorry, busy deleting test shots...

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure

« Reply #6 on: 18 / March / 2021, 11:38:42 »

Quote from: c_joerg on 18 / March / 2021, 02:33:47

Quote from: reyalp on 17 / March / 2021, 16:37:19
I don't understand what the iso_mode manipulation is intended to accomplish.

Neither do I…
Maybe a darkening of the display?
However, this cannot prevent the main temperature development of the sensor.
The problem is that the sensor is constantly being read. In order to reduce the temperature increase, the reading of the sensor had to be prevented during the breaks.

I agree.
I found "amplifier glow" & thought, that iso heats that amplifier, cooking sensor...
in some cases near asteroids belt.

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reyalp

14125

Re: various script discussion (was Re: rawopint.lua: Fast, accurate intervalometer with raw exposure

« Reply #7 on: 18 / March / 2021, 13:24:44 »

Quote from: Caefix on 18 / March / 2021, 11:38:42

I agree.
I found "amplifier glow" & thought, that iso heats that amplifier, cooking sensor...

I don't have hard data but IMHO, seeing amp glow more at high ISO has more to do with amplifying the stuff close to the noise floor than the amp working harder.

In any case, the ISO setting doesn't control the actual amplifier setting between shots. The camera juggles shutter speed and gain to provide an appropriate preview. See https://chdk.setepontos.com/index.php?topic=13508.msg145106#msg145106

If you wanted to make the camera read out less often in live view, you'd want it to use as long exposure as possible to force the frame rate down. This would suggest setting a high ISO setting in the UI, so the camera will need to make the preview brighter, which will (all else being equal) require longer exposure. No idea whether this has perceptible impact. I'd expect half press to run hotter than idling in live view, because it draws more power and the camera normally uses a higher frame rate and likely clocks some things faster.

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