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film speed - Photography

"thomas donnelly" <thomasd206cox.net> wrote in message news:P6B0b.8429$Go4.98lakeread01... > i have been told that you can use a film that is one speed and use it as a > higher speed but you would need to mark the roll as the differrent speed > what effect will that have on the quality of the pictures ? > are there limits to what you can change ie can you use 100 film as 800 ?? > thanks from a newbie to the field > > Generally those one speed films are 200 ASA. Results will be as expected, grainy the higher you ...

  1. #1

    Default Re: film speed


    "thomas donnelly" <thomasd206cox.net> wrote in message
    news:P6B0b.8429$Go4.98lakeread01...
    > i have been told that you can use a film that is one speed and use it as a
    > higher speed but you would need to mark the roll as the differrent speed
    > what effect will that have on the quality of the pictures ?
    > are there limits to what you can change ie can you use 100 film as 800 ??
    > thanks from a newbie to the field
    >
    >
    Generally those one speed films are 200 ASA. Results will be as expected,
    grainy the higher you go etc...good luck and keep shooting.


    The Review Guest

  2. #2

    Default Re: film speed

    thomas donnelly wrote:
    >
    > i have been told that you can use a film that is one speed and use it as a
    > higher speed but you would need to mark the roll as the differrent speed
    > what effect will that have on the quality of the pictures ?
    > are there limits to what you can change ie can you use 100 film as 800 ??
    > thanks from a newbie to the field
    You can use films at different ISO as they are rated but they need
    to be developed accordingly to ISO they were shot. That means if
    you are shooting ISO 200 film rated as ISO 400, then it has to be
    processed as ISO 400 (push processing) and not as ISO 200.
    Only usefull thing in my opinion is to push films if you are shooting
    somewhere and you have only let's say ISO 200 film with you but you
    would need higher rated ISO film. You have to have someone who is
    able of push processing (1 hour photo "labs" are usually not able
    to do this), and you have to count that you can't push films to
    infinity. That means you can't really push ISO 100 film to ISO 3200.
    Usually it's written on film how much you can do it but basicaly
    you can go up for 2 stops (ISO 200 to ISO 800, ISO 400 to ISO 1600
    etc.).
    But as I said... first check if your lab can do push processing,
    and if it can't then it's probably time for new lab :)

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