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Film Speed Question  
User currently offlineBruce From United States of America, joined May 1999, 5083 posts, RR: 14
Posted (14 years 1 week 4 days 13 hours ago) and read 1877 times:

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 Leibowitz - Jackson, MS (KJAN) - Canon 50D/100-400L IS lens
4 replies: All unread, jump to last
User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 17
Reply 1, posted (14 years 1 week 4 days 12 hours ago) and read 1866 times:

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).

I wish I were flying
User currently offlineBruce From United States of America, joined May 1999, 5083 posts, RR: 14
Reply 2, posted (14 years 1 week 4 days 7 hours ago) and read 1852 times:

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
User currently offlineDa fwog From United Kingdom, joined Aug 1999, 867 posts, RR: 7
Reply 3, posted (14 years 1 week 4 days 7 hours ago) and read 1850 times:

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.

User currently offlineCfalk From , joined Dec 1969, posts, RR:
Reply 4, posted (14 years 1 week 3 days 23 hours ago) and read 1841 times:


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.



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