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Bruce
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Joined: Tue May 18, 1999 2:46 am

Film Speed Question

Thu Jul 26, 2001 2:30 am

My new camera comes with a setting to adjust the ISO speed like 100, 200, 400, etc.

But aren't all DX-coded film automatic? Should I use one that is not?

If I bought a roll of ISO100, and set the dial to 400, would that change the film?

BTW, the camera is and EOS300


Bruce
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
jwenting
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RE: Film Speed Question

Thu Jul 26, 2001 3:36 am

Your camera allows you to choose to change the filmspeed if you want, or to use film without DX coding.

Changing the speed will tell the meter to expose for a different rating. You will then have to have that film processed specially to use that rating (and not in the automated machines which also use the DX coding).
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Bruce
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RE: Film Speed Question

Thu Jul 26, 2001 9:12 am

So can i take a few pics from the roll using 100 speed, and a few more at 400, then how would I tell them to process it? If not all the frames are the same ISO speed?
Bruce Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
 
da Fwog
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RE: Film Speed Question

Thu Jul 26, 2001 9:17 am

Nope - you need to take the whole roll on one setting.

Basically, unless it's a dire emergency, don't expose ANY roll of film at anything other than its rated setting. And as virtually any roll of film you buy these days should already be DX coded, it's unlikely you will ever need to resort to specifying the speed manually.
 
cfalk
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RE: Film Speed Question

Thu Jul 26, 2001 4:49 pm

Bruce,

The whole film MUST be shot at the same ISO rating. Preferably, you will know even before you put the film in the camera that you will "push" it, so that you use a marker on the film canester, mark it +1 or +2, put the film in, adjust the ISO and shoot the whole film like that. Marking the canister will make sure that you don't forget to tell the lab to push-process.

Cheers,

Charles
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