ASA/ISO

Film Photography & Darkroom discussion

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Mihangel
Posts: 1
Joined: Tue Jan 30, 2024 8:19 am

ASA/ISO

Post by Mihangel »

Can you please help re understanding your development time chart. I'm using Fomapan 200, depending on which developer I use I note under the ASA/ISO column there can be different ASA/ISO ratings. I'm currently using Perceptual so that is straight forward and the column shows ASA200. However if I was using Ilfotec DD-X with the Fomapan 200 it shows both 200 and 400 ASA. Why is this?
Thank you.
Mike

Keith Tapscott.
Posts: 554
Joined: Tue Jan 17, 2006 8:58 am
Location: Plymouth, England.

Re: ASA/ISO

Post by Keith Tapscott. »

ISO incorporates the ASA number and the DIN thus ISO 100/21* represents 100 ASA/ 21* DIN
Hope this helps.

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