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Dual ISO, dynamic range improvement

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Offline dvip

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Dual ISO, dynamic range improvement
« on: 17 / July / 2013, 12:06:17 »
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I wonder if this is possible using a small sensor:

http://www.magiclantern.fm/forum/index.php?topic=7139.0


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Offline philmoz

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Re: Dual ISO, dynamic range improvement
« Reply #1 on: 17 / July / 2013, 15:47:04 »
I wonder if this is possible using a small sensor:

http://www.magiclantern.fm/forum/index.php?topic=7139.0

Unlikely as it requires two, independently configurable, amplifier circuits between the sensor and ADC.
If Canon has only done this on the 5DIII and 7D DSLR's I doubt we would see this on any P&S.

Phil.
CHDK ports:
  sx30is (1.00c, 1.00h, 1.00l, 1.00n & 1.00p)
  g12 (1.00c, 1.00e, 1.00f & 1.00g)
  sx130is (1.01d & 1.01f)
  ixus310hs (1.00a & 1.01a)
  sx40hs (1.00d, 1.00g & 1.00i)
  g1x (1.00e, 1.00f & 1.00g)
  g5x (1.00c, 1.01a, 1.01b)
  g7x2 (1.01a, 1.01b, 1.10b)

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Offline ursamajor

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  • SX150IS, SX510HS
    • Per aspera ad astra...
Re: Dual ISO, dynamic range improvement
« Reply #2 on: 19 / May / 2016, 13:37:14 »
Indeed in 2013 DualISO worked only on 5D. Now it is supported by much many cameras. CHDK still not support something similar to improve not necessarly DR but the noise? Just asking...  :D

PS: it would be a dream come true, a charming one.  :xmas
SX150IS (retired) :D, SX510HS

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Offline koshy

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Re: Dual ISO, dynamic range improvement
« Reply #3 on: 04 / May / 2021, 19:36:12 »
Forgive me for necromancing this thread, but I was just playing with the dual ISO stuff on a 5D Mk II in previous weeks and it is very interesting. I think I love it, I shot at ISO 800 +1EV with a ISO 100 secondary for highlight recovery.
I didn't look at its requirements in terms of hardware in detail but noticed that its implementation changed sometime to encompass more DSLRs. Was what phil summarized the end of it
Unlikely as it requires two, independently configurable, amplifier circuits between the sensor and ADC.
If Canon has only done this on the 5DIII and 7D DSLR's I doubt we would see this on any P&S.
Or did it become possible for any CHDK camera?

Well, not any I guess; anything newer than the Ixus 980 990 can hardly be used properly for RAW shooting due to the geometric distortion correction fix or rather lack thereof. But for those select few, already having a 12 bit AD/C and not yet having lens designs favoring field curvature over astigmatism (as the former is easily corrected if you have the computational power) I do second this:
it would be a dream come true, a charming one.  :xmas
Koshy had a little ELPH which wasn't white as snow but everywhere that Koshy went the ELPH was sure to go. (actually an SD, but that detail ruins the rhyme...)


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Offline Ant

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Re: Dual ISO, dynamic range improvement
« Reply #4 on: 05 / May / 2021, 02:44:02 »
Or did it become possible for any CHDK camera?
It possible only for some cameras with canon's APSC sensor.

https://chdk.setepontos.com/index.php?topic=12754.msg136098#msg136098


 

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