Talk:Film speed

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ISO in digital cameras[edit]

It would be good to have a separate article on ISO in digital cameras, as it is so widely misunderstood mainly because of its heritage and meaning in film. — Preceding unsigned comment added by Chrisvdberge (talkcontribs) 12:07, 5 May 2017 (UTC)[reply]

As a start, I changed the description in the first paragraph, relating to ISO in digital cameras, which said 'A closely related ISO system is used to measure the Digital signal gain of digital imaging systems', which is simply wrong. Hopefully this will help avoid promulgating some of the misunderstandings mentioned. Bobn2 (talk) 22:37, 10 August 2017 (UTC)[reply]

The ISO capabilities of the Nikon digital cameras has been misrepresented. For example, the REAL maximum ISO of the D5 is 102400 (see it's own article), however it is recorded here as the 'expanded' number, which is a misleading figure. 51.6.244.129 (talk) 20:31, 22 October 2017 (UTC)[reply]

Given the five different ways the ISO standard allows computing the ISO value, this isn't so obvious. It might be, for example, that the 10240 is using the 40:1 S/N ratio, and the higher one is with the allowed 10:1 ratio. Camera companies don't want to claim too high an ISO value, such that the noise level is high, and people get disappointed with image quality. On the other hand, in cases where there is no choice, you can get some amazing pictures with the expanded value. Gah4 (talk) 22:06, 22 October 2017 (UTC)[reply]

External links modified[edit]

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marketing anomalies[edit]

In the case of black and white films, the ISO standard specifies development for specified contrast levels. In the case of color films, like C41 and E6, the times are fixed. Films like the Ektachrome P800/1600 might not actually be pushed in the technical sense, as they are developed for the appropriate time for that film, which happens to be longer than the process-specified time. For Delta 3200, the characteristic curve has an unusual shape, such that the ISO standard doesn't work as well. There is no straight line section in the Delta 3200 curve.[1] Gah4 (talk) 18:34, 29 October 2018 (UTC)[reply]

References

  1. ^ "Technical information Delta 3200 professional". www.ilfordphoto.com. Ilford Photo. Retrieved 29 October 2018.

Missing Interwiki Links[edit]

These links are missing: da:ISO (filmfølsomhed), fr:Sensibilité ISO, ja:ISO感度, sv:ISO-grader. --2A02:810A:86C0:6590:88F1:C654:218E:9873 (talk) 17:21, 21 May 2020 (UTC)[reply]

ASA: 1943 vs. 1960[edit]

I think the ASA section needs a conversion table for ASA 1942 vs. ASA 1960, to make the change more transparent, complete with a third column for modern ISO, to show easily how ISO is still identical to ASA 1960 in values. --2003:DA:CF39:B861:60FA:97C4:BA2C:67AC (talk) 23:15, 25 July 2023 (UTC)[reply]