High Speed Film 400 ASA or greater
400 ASA is probably the most common higher speed film, although instant processing films available are actually 800 ASA rated. There are also some 800 ASA colour films.

400 ASA black and white are also common with a few rated higher available.

In practise many lower rated films can have their speed potential increased at the processing stage at the expense of a loww of grain and ohter factors.