/p/ - Photography » Thread #4411768

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Anonymous Mon 03 Mar 2025 12:15:48 No.4411768 View View Reply Original Report

Why do so many film companies lie about their film speed? Delta 3200 is a 1000 iso film. portra 800 is like a 640 iso film. cinestill is vision 3 so 800t is 500t and 500d is 250d.
Like look at this confusing shit
>set your ISO on your light meter to 3200
>actually its a 1000 speed film lol
I guess digital cameras are just as fucking bad where a lot of them lie about ISO. Actually do external lightmeters even work for digital or do they assume everyone will just ttl and that is how they hide their ISO and tstop lies?

Anonymous

Anonymous Mon 03 Mar 2025 12:20:06 No.4411769 Report

Quoted By: >>4411908 >>4417089

Literally the last sentence, fag.

Anonymous

Anonymous Mon 03 Mar 2025 13:46:25 No.4411777 Report

Quoted By:

>>4411768
good job figuring that out Anon, it's par for the course when you learn about film

Yes, speeds are based on development times

Pushing and pulling is basic stuff, play with it

Anonymous

Anonymous Mon 03 Mar 2025 20:01:10 No.4411842 Report

Quoted By:

the iso number on the box is just based on iso 6 1993, which is a standard for a certain degree of film density with a certain degree of development. it has no practical use in photography. for bw film photography you should measure the actual speed of your film (which changes with development type and time, enlarger type and some other factors) as described by AA in "the negative".
as a rule of thumb you can assume that actual speed is around half of the one on the box for 400 iso films, and around 30% less for 100 iso films (64-80 iso).

Anonymous

Anonymous Mon 03 Mar 2025 23:40:51 No.4411908 Report

Quoted By:

>>4411769
>Literally the last sentence, fag.
nooo purposely under expose your film.
you are a gay retard, they even admit its a 1000 speed film, but write it weird

Anonymous

Anonymous Sun 23 Mar 2025 01:29:23 No.4417089 Report

Quoted By:

>>4411769
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