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#1
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Higher ISO more sensitive to infrared light?
I'm a layman wondering if (generally speaking) increasing the ISO setting
increases sensitivity to infrared light. Thanks. |
#2
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Higher ISO more sensitive to infrared light?
On 15/05/2021 04:48, John Doe wrote:
I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. Thanks. Simple answer: No. -- Cheers, David Web: http://www.satsignal.eu |
#3
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Higher ISO more sensitive to infrared light?
In article , John Doe
wrote: I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. increasing iso simply amplifies the signal, regardless of wavelength. |
#4
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Higher ISO more sensitive to infrared light?
On 2021-05-14 23:48, John Doe wrote:
I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. Yes of course it does - at least to near infrared and possibly further. But most cameras have an IR filter over the sensor blocking those wavelengths. -- "...there are many humorous things in this world; among them the white man's notion that he is less savage than the other savages." -Samuel Clemens |
#5
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Higher ISO more sensitive to infrared light?
On 15/05/2021 22:45, Alan Browne wrote:
On 2021-05-14 23:48, John Doe wrote: I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. Yes of course it does - at least to near infrared and possibly further. But most cameras have an IR filter over the sensor blocking those wavelengths. But increasing the ISO does not typically increase the sensitivity - the signal-to-noise ratio - it just increases the gain. The blocking filter needs to be removed (not a trivial task) to increase the (relative) sensitivity to (near) infra-red light. Hence my answer of "No". -- Cheers, David Web: http://www.satsignal.eu |
#6
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Higher ISO more sensitive to infrared light?
On 2021-05-16 01:14, David Taylor wrote:
On 15/05/2021 22:45, Alan Browne wrote: On 2021-05-14 23:48, John Doe wrote: I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. Yes of course it does - at least to near infrared and possibly further. Â*Â* But most cameras have an IR filter over the sensor blocking those wavelengths. But increasing the ISO does not typically increase the sensitivity - the signal-to-noise ratio - it just increases the gain.Â* The blocking filter needs to be removed (not a trivial task) to increase the (relative) sensitivity to (near) infra-red light.Â* Hence my answer of "No". Splitting hairs. As a system, increasing ISO increases the system sensitivity. Gain is sensitivity no matter where applied. If there are noise consequences, then so be it. And of course signal to noise ratio â‰* sensitivity. It's a measure of quality and goes to system bandwidth. And while, for a certain range of ISO, the gain is numeric, some sensors have analog gain at the sensor chip pushing the gain closer to where the signal was obtained. So not a definite no, just something requiring a clear answer with more facts. -- "...there are many humorous things in this world; among them the white man's notion that he is less savage than the other savages." -Samuel Clemens |
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Higher ISO more sensitive to infrared light?
On 16/05/2021 12:36, Alan Browne wrote:
Splitting hairs. As a system, increasing ISO increases the system sensitivity. Gain is sensitivity no matter where applied. If there are noise consequences, then so be it. And of course signal to noise ratio â‰* sensitivity. It's a measure of quality and goes to system bandwidth. And while, for a certain range of ISO, the gain is numeric, some sensors have analog gain at the sensor chip pushing the gain closer to where the signal was obtained. So not a definite no, just something requiring a clear answer with more facts. Although likely beyond the range of an answer for a "layman", as originally requested! It is encouraging that sensors today are much nearer than they used to be to the shot/photon noise limited level. A good big sensor will always beat a good small sensor! More photons. Having said that, I've been very pleased in recent times with the ability of my Google Pixel phone to have stacking inbuilt, and achieving results which exceed what my eyes can see. It works very well. Since having a decent phone I've done much more photography. -- Cheers, David Web: http://www.satsignal.eu |
#8
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Higher ISO more sensitive to infrared light?
In article , David Taylor
wrote: It is encouraging that sensors today are much nearer than they used to be to the shot/photon noise limited level. they've been at that level for quite some time. A good big sensor will always beat a good small sensor! More photons. all things being equal, yes. the problem is that they never are. Having said that, I've been very pleased in recent times with the ability of my Google Pixel phone to have stacking inbuilt, and achieving results which exceed what my eyes can see. It works very well. in other words, things aren't equal. computational photography can compensate for the drawbacks of smaller sensors and in many cases, can exceed what a larger sensor could have done. Since having a decent phone I've done much more photography. everyone has. |
#9
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Higher ISO more sensitive to infrared light?
On 2021-05-16 09:07, David Taylor wrote:
Although likely beyond the range of an answer for a "layman", as originally requested! Laymen are not immune to understanding things. "John Doe" already knows about infrared. So give someone more food for thought and he has more to go on in learning more. -- "...there are many humorous things in this world; among them the white man's notion that he is less savage than the other savages." -Samuel Clemens |
#10
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Higher ISO more sensitive to infrared light?
Incubus wrote:
John Doe wrote: I'm a layman wondering if (generally speaking) increasing the ISO setting increases sensitivity to infrared light. As others have pointed out, the sensitivity doesn't increase but rather the gain. Digital cameras tend to have an IR filter to block IR. If yours has been IR converted (the filter removed, in other words) then changing the ISO will impact IR as well as visible light. I'm satisfied. Thanks to the replies. |
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