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  #31  
Old 8th August 2019
Internaut Internaut is offline
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

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Originally Posted by Beagletorque View Post
What is native iso?
Lowest ISO level that isnít compromised is the best definition I can come up with. Feel free to invent something better.
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  #32  
Old 8th August 2019
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Beagletorque Beagletorque is offline
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

Technically the native iso is the sensitivity of the sensor compared to old film stock when the output is not amplified by the electronics.
But why does it matter. If the best DR and lowest noise of a sensor is at iso 200 why would having it at 100 be better? Unless you need a slower shutter speed obviously!
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  #33  
Old 8th August 2019
Harold Gough Harold Gough is offline
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

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What if we mirror coated the inside of the lens hood.
An anti-hood. Try that one out in the Dragons' Den! It certainly has a USP.

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  #34  
Old 8th August 2019
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

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Originally Posted by Beagletorque View Post
Technically the native iso is the sensitivity of the sensor compared to old film stock when the output is not amplified by the electronics.
But why does it matter. If the best DR and lowest noise of a sensor is at iso 200 why would having it at 100 be better? Unless you need a slower shutter speed obviously!
DR tends to be better at the lower ISO. Consider a relatively ISO Invariant sensor like that in the Sony A7 II. I'm shooting a brightly lit night scene and getting fast enough shutter speeds at ISO 800. At that level, noise is good, but highlights blow easily. What I can do instead is shoot at ISO 400 and under expose by one stop. With the DR of this sensor, I can also consider shooting at ISO 200 and under expose by two stops. Processed in Capture One, I get ISO 800 equivalent either way (just with far richer highlight colours).

So, to answer you question, having a "native" base ISO of 100 simply rocks compared to having a "native" base ISO of 200. Assuming an ISO Invariant sensor, you can under expose by 1 stop and have shadows equivalent to ISO 200 plus better protected highlights.

I believe Nikon introduce their own magic circuitry to the same Sony designed sensors to give an even lower "true" base sensitivity. Sony, of course, offers an ISO 50 - great for flash photography in the studio, but compromised in any scene that's contrasty.
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Old 9th August 2019
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

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Originally Posted by Beagletorque View Post
What is native iso?
It's an ISO at home.
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  #36  
Old 9th August 2019
Harold Gough Harold Gough is offline
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Re: If Sensor Size Doesn't Matter, Why Buy a Bigger One?

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Originally Posted by Beagletorque View Post
It's mostly down to the physics of collecting photons. Just like collecting rain. You have 2 measuring tubes with the same with a scale on them, one has a 1 meter diameter funnel feeding it and the other funnel is only 6" in diameter. When you have a 2 minute shower the funnels collect the same amount of rain for their respective areas. One tube fills up nicely, the other has very little in it. You can calculate how many mm of rain fell with greater certainty for the larger funnel.
What we need is Freznel pixels. Lenses:

https://www.edmundoptics.co.uk/c/fre...SAAEgKlv_D_BwE

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