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#41
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Meaning of ISO value in digital photography?
In article ,
Sandman wrote: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Short answer: yup. correct. ISO for film and "ISO" for digital sensor has very little in common. not correct. |
#42
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Meaning of ISO value in digital photography?
In article , Carlos E.R.
wrote: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Short answer: yup. ISO for film and "ISO" for digital sensor has very little in common. I thought they had quite a lot in common as it stands for International Standards Organization which covers light sensitivity of a sensor or film doesn't matter which. That's what it means by a standard, previously film was ASA which was american while Europe used DIN , so a new standard was created for everyone with digital or film and it was called ISO not to be confused with ios of course. I would think that a film camera loaded with film of a certain iso rating and a digital camera adjusted to that same iso rating do a similarly lighted photo when adjusted to the same diaphragm and shutter speed, so that a photographer can adjust both with the same settings using the same handheld light measurement instrument. that is correct. |
#43
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Meaning of ISO value in digital photography?
In article ,
Whisky-dave wrote: I would think that a film camera loaded with film of a certain iso rating and a digital camera adjusted to that same iso rating do a similarly lighted photo when adjusted to the same diaphragm and shutter speed, so that a photographer can adjust both with the same settings using the same handheld light measurement instrument. That is the general idea similar to any standard. Previously germany and some of europe had the DIN standad for film speeds in the 1930s. DIN 18 was 50 ASA or 50 ISO. They may have tweeted the figures a little like they do with the speed of light can be quoted as 186,000 miles per second or 300,000 km/s but a mile is 1.60934 km so 1.60934X186,000 = 299,337.24 km/s So which is corect for most of us it doesn't matter. math fail. |
#44
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Meaning of ISO value in digital photography?
In article ,
Whisky-dave wrote: Previously germany and some of europe had the DIN standad for film speeds in the 1930s. DIN 18 was 50 ASA or 50 ISO. They may have tweeted the figures a little like they do with the speed of light can be quoted as 186,000 miles per second or 300,000 km/s but a mile is 1.60934 km so 1.60934X186,000 = 299,337.24 km/s So which is corect for most of us it doesn't matter. math fail. But I converted it from c= 1 foot per nanosecond the new SI unit. ;-P whoosh. |
#45
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Meaning of ISO value in digital photography?
In article ,
Whisky-dave wrote: speed of light can be quoted as 186,000 miles per second or 300,000 km/s but a mile is 1.60934 km so 1.60934X186,000 = 299,337.24 km/s So which is corect for most of us it doesn't matter. math fail. But I converted it from c= 1 foot per nanosecond the new SI unit. ;-P whoosh. So why don't you explain this maths fail what is the speed of light in your world ? sig figs |
#46
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Meaning of ISO value in digital photography?
On 2018-06-20 16:05, Whisky-dave wrote:
On Wednesday, 20 June 2018 10:48:09 UTC+1, Carlos E.R. wrote: On 2018-06-20 11:17, Whisky-dave wrote: On Wednesday, 20 June 2018 09:12:40 UTC+1, Sandman wrote: In article , Jim-P wrote: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Short answer: yup. ISO for film and "ISO" for digital sensor has very little in common. I thought they had quite a lot in common as it stands for International Standards Organization which covers light sensitivity of a sensor or film doesn't matter which. That's what it means by a standard, previously film was ASA which was american while Europe used DIN , so a new standard was created for everyone with digital or film and it was called ISO not to be confused with ios of course. I would think that a film camera loaded with film of a certain iso rating and a digital camera adjusted to that same iso rating do a similarly lighted photo when adjusted to the same diaphragm and shutter speed, so that a photographer can adjust both with the same settings using the same handheld light measurement instrument. That is the general idea similar to any standard. Previously germany and some of europe had the DIN standad for film speeds in the 1930s. DIN 18 was 50 ASA or 50 ISO. Many cameras and most rolls had both units here. Actually, DIN and ASA rather than ISO. By the way, I don't know what ASA means, can't decide on the Wikipedia page: https://en.wikipedia.org/wiki/ASA Could be "American Standards Association". Ah, it is he https://en.wikipedia.org/wiki/Film_speed#ASA ASA aka ANSI -- Cheers, Carlos. |
#47
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Meaning of ISO value in digital photography?
On Wed, 20 Jun 2018 02:17:50 -0700 (PDT), Whisky-dave
wrote: On Wednesday, 20 June 2018 09:12:40 UTC+1, Sandman wrote: In article , Jim-P wrote: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Short answer: yup. ISO for film and "ISO" for digital sensor has very little in common. I thought they had quite a lot in common as it stands for International Standards Organization which covers light sensitivity of a sensor or film doesn't matter which. That's what it means by a standard, previously film was ASA which was american while Europe used DIN , so a new standard was created for everyone with digital or film and it was called ISO not to be confused with ios of course. Before the ASA standard most film was rated in Weston and DIN. See https://en.wikipedia.org/wiki/Film_speed#Weston -- Regards, Eric Stevens |
#48
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Meaning of ISO value in digital photography?
In article , Whisky-
dave wrote: Jim-P: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Sandman: Short answer: yup. ISO for film and "ISO" for digital sensor has very little in common. I thought they had quite a lot in common Then you thought wrong. -- Sandman |
#49
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Meaning of ISO value in digital photography?
On 2018-06-21 11:04, Whisky-dave wrote:
On Thursday, 21 June 2018 05:07:29 UTC+1, Eric Stevens wrote: On Wed, 20 Jun 2018 02:17:50 -0700 (PDT), Whisky-dave wrote: Before the ASA standard most film was rated in Weston and DIN. See https://en.wikipedia.org/wiki/Film_speed#Weston That was a bit before my time so I never really experienced it. I did find my first exposure meter the other day, well a bit of it, think the make was sekonda or similar and it used a CDs cell I think, it had a needle and a dial and a little plastic cream shutter that rolled over the sensor. Next time it re-appears I'll have to photograph it. The description matches one my father had. I have it somewhere, but he had to stop using it when the calibration went wrong and we did not know how to mend it. It used no batteries. The leather pouch is labelled sixtomat. The device itself lost the label. The needle doesn't move anymore. On the rear it has a "color finder" thing, name "Gossen". It is for finding the colour temperature. It says my led lights on my desk give 2600, while the room ones give perhaps 4000. It was for "cine" ussage, I think. There are photos on google. Seems to be this one: http://www.camarassinfronteras.com/accesorios/sixtomat/sixtomat.html but my pouch is different. -- Cheers, Carlos. |
#50
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Meaning of ISO value in digital photography?
In article ,
Sandman wrote: Jim-P: In film cameras, ISO referrs to the sensitivity to light of the emulsion. Manufacturers formulate different film emulsions with different sensitivites tarding increased grain with increased ISO speed. In a digital camera, presumably the sensor does not adjust itself to have greater sensitivity. Or does it? So what is happening in a digital camera when I choose a greater ISO setting? Is more amplification being used? Sandman: Short answer: yup. ISO for film and "ISO" for digital sensor has very little in common. I thought they had quite a lot in common Then you thought wrong. nope. he is correct. you are not. |
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