Camera ISO settings?

I have a Nikon l35af and I have a roll of 800 iso film. The camera's iso settings go from 400 to 500 to 640 to 1000, which is the max. Does this mean I can't use the 800 film properly? Which setting should I choose if I want to use the 800?

800 would be somewhere between 640 and 1000 (duh!) If you can't set it exactly at 800, 1000 would be close enough.

There are complicated answers but for all intents and purposes, what you should do with any print film is rate it at box speed or slower than box speed within 1 stop. So rate your 800 print film at 800 (in between 640 and 1000) or at 640.

ISO, like shutter and aperture is measured in stops.

100 is one stop slower (less light sensitive) than 200, 200 is one stop slower than 400, 400 is one stop slower than 800, 800 is one stop slower than 1600. See the relationship? The number doubles each time. So 800 is less than one stop faster (more light sensitive) than 640 and less than one stop slower than 1000. So we're only talking about approximately a quarter of a stop difference. A quarter of a stop incorrect exposure makes a noticeable difference is with slide film, instant film and digital. Not print film, because it has too much dynamic range for a quarter of a stop to matter. And all 800 ISO films currently on the market are print films. So you should be fine.

Consult this ISO chart to get a handle on the relationship:

In the future, it's important for you to specify the film you are using. If you'd said 100 ISO, this would have been much more complicated a question because you'd be including slide film as a possibility.

Enjoy your film and please don't forget to choose a best answer!

Set ISO between 640 and 1000.