Google| Subject | Re: ISO value names are becoming ridiculous |
| From | nospam |
| Date | 01/09/2016 07:15 (01/09/2016 01:15) |
| Message-ID | <090120160115309229%nospam@nospam.invalid> |
| Client | |
| Newsgroups | rec.photo.digital |
| Follows | Whisky-dave |
In article <4e722fcc-65af-4629-a9f6-d5bae61cbecd@googlegroups.com>, Whisky-dave <whisky.dave@gmail.com>wrote:
true.Whisky-daveSandmannospam
That said, ISO *has* a logarithmic part, inherited from DIN, where each step is one third of a double in sensitivity. Hence the ISO 100/21, ISO 200/24 etc.
iso is a logarithmic scale, with each step double the previous, or log base 2. din is an arithmetic scale, incrementing by 1 each step.
it's 7th grade math.
with din, each step represents a doubling of sensitivity,
No it doesn't.
each 3 steps in DIN is a which is why doubling of sensitivity. i.e DIN 21 is twice as sensitive as DIN 18
each step is 1/3rd stop, but that doesn't change the type of scale it is.
01/06/2016-
