I recently shot 2 rolls of provia 100f, and just got the film back from the lab. Everything was great, the highlights were spot on, the shadows were dark enough to give the early morning feel that i wanted. Great stuff. It's getting to be autumn here, and I'd like to shoot some scenes that will contain a full range of light, from very dark to quite bright-ish. I'm concerned, though, that the highlights will be right, as I try to place them about Z6.5-7, to prevent them being blown out, but the shadows will lack detail. How do I ask the lab to increase shadow levels, is it like B&W, where decreased development can decrease the density in the areas with the greatest amount? If so, how will that impact the highlights? I'm new to shooting transparencies, although I am aware that your exposure should be based on your scenes highlights, similar to negative film, but in reverse. I'm shooting the slides on an RB-67, and hope to get them printed, or last resort, scanned and printed.