I bought a 5X7 camera

Counting both 13x18 and 5x7 there are 10 different color emulsions available. See my post above for a link to a complete list.

Soeren said:

Last time I looked on the Ilford site they only mentiond 5X7".

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I read in the wrong list - I looked at the item list under the specific product. That list isn't easy to read. There are two columns with metric size and inch size and if one looks closely, the 5x7 inch size gives 12.7x17.8 cm in metric, while the metric 13x18 cm also gives 5x7 as the inch size!

That's the difference between nominal size and real size again, I'm afraid...

5x7" film is not 5 inches by 7 inches, but a small fraction smaller. The original glass plates were truly 5x7", but in the transition to cut film the adapers used a few mm either way. So now a 5x7" film is a little bit smaller than 5 inches by 7 inches.

By an unfortunate coincidence the standard size for nominal 13x18cm (using "nominal" to mean "the film size named xxxx") ended up being very close to 12.7x17.8mm, or almost exactly 5 inches by 7 inches.

5x7" is about 12.5x17.7cm.
13x18cm is about 12.7x17.8cm.

Believe me, those 2mm are crucial at times.

Ole said:

5x7" is about 12.5x17.7cm.
13x18cm is about 12.7x17.8cm.

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Oh well. I thought I 13x18 really were 13x18, because my plateholders take 13x18 cm glass. It's more complex than one could ever imagine...

That's exactly it - my plateholders also take 13x18cm glass. Or 13x18cm sheet film adapters, which take 12.7x17.8cm film...