Quote Originally Posted by clayne View Post
Astia, Provia, or EPP. Honestly, any of 'em will work. Provia will afford you EI400.
To clarify, there is ISO 100 Provia and ISO 400 Provia (400X).
Make sure you use AE, a meter, or know light like the back of your hand. [/QUOTE]

Meter incident, if you can. I don't recommend AE unless you tightly control it.
Without an incident meter I find it's better to know light like the palm of your hand. That is, the method I use to ensure good exposure with slide film is to meter off the palm of my hand and open up a stop. Or read directly off a gray card. Both are effectively similar to incident reading the light, which I consider for slides superior to reading reflected light.