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#51
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Meaning of ISO value in digital photography?
In article ,
Whisky-dave wrote: I did find my first exposure meter the other day, well a bit of it, think the make was sekonda or similar sekonic 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. that's for measuring incident light. |
#52
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Meaning of ISO value in digital photography?
On 2018-06-21 16:21, Whisky-dave wrote:
On Thursday, 21 June 2018 11:12:10 UTC+1, Carlos E.R. wrote: 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 Yes that's a pretty close match. but my pouch is different. I don't think I had one to start with. Mine has the exact shape of the device and fits exactly, so it is original. Meanwhile, I found out I also have the instruction booklet :-) My father was much more organized than me. -- Cheers, Carlos. |
#53
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Meaning of ISO value in digital photography?
On 6/21/2018 9:14 AM, Whisky-dave wrote:
On Thursday, 21 June 2018 10:51:55 UTC+1, Sandman wrote: 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. I know I'm correct you have **** all idea. I'll say this, my Minolta-IV-F-Light-Meter is dead nuts on both film and digital when in the manual mode. Beats my Nikon D80's built in meter. Of course it's essential for my 500 C/M and 4x5 |
#54
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Meaning of ISO value in digital photography?
On 6/21/2018 8:21 PM, gray_wolf wrote:
On 6/21/2018 9:14 AM, Whisky-dave wrote: On Thursday, 21 June 2018 10:51:55 UTC+1, SandmanĀ* wrote: 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. I know I'm correct you have **** all idea. I'll say this, my Minolta-IV-F-Light-Meter is dead nuts on both film and digital when in the manual mode. Beats my Nikon D80's built in meter. Of course it's essential for my 500 C/M and 4x5 I still use my old Sekonic For certain images, that I like to shoot in manual mode. It too is spot on. -- PeterN |
#55
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Meaning of ISO value in digital photography?
On Thu, 21 Jun 2018 09:39:51 -0400, nospam
wrote: In article , Whisky-dave wrote: I did find my first exposure meter the other day, well a bit of it, think the make was sekonda or similar sekonic As in Seiko. A close relative of Epson. 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. that's for measuring incident light. -- Regards, Eric Stevens |
#56
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Meaning of ISO value in digital photography?
In article , Eric Stevens
wrote: I did find my first exposure meter the other day, well a bit of it, think the make was sekonda or similar sekonic As in Seiko. A close relative of Epson. as in made by sekonic: https://www.photrio.com/forum/attachments/dsc01839-jpg.60853/ https://www.photrio.com/forum/attachments/dsc01840-jpg.60854/ sekonic today: https://www.sekonic.com/ seiko was well known for shutters: https://www.photrio.com/forum/attachments/seiko-slv-front-jpg.156169/ close, but not quite were mamiya/sekor cameras: https://c1.staticflickr.com/1/178/458003503_b04be90dd8_b.jpg |
#57
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Meaning of ISO value in digital photography?
On Fri, 22 Jun 2018 20:54:28 -0400, nospam wrote: In article , Eric Stevens wrote: I did find my first exposure meter the other day, well a bit of it, think the make was sekonda or similar sekonic As in Seiko. A close relative of Epson. as in made by sekonic: https://www.photrio.com/forum/attachments/dsc01839-jpg.60853/ https://www.photrio.com/forum/attachments/dsc01840-jpg.60854/ sekonic today: https://www.sekonic.com/ seiko was well known for shutters: https://www.photrio.com/forum/attachments/seiko-slv-front-jpg.156169/ close, but not quite were mamiya/sekor cameras: https://c1.staticflickr.com/1/178/458003503_b04be90dd8_b.jpg https://www.sekonic.com/united-state...y/aboutus.aspx "Established in June 1951 as Seiko Electric Industries Co., Ltd." -- Regards, Eric Stevens |
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