Originally posted by cooltouch Ektar is the one negative film that I wouldn't ordinarily push or pull. Well, I might push it a bit, but I wouldn't pull it the way I would with just about any other color print film I can think of. In fact, your tests seem to be more indicative of slide film than print film, especially Kodachrome. Note the deeper color saturation in the -1 and -2 stop images. In fact, I could easily call the -1 stop image "normal," whereas the +1 stop is starting to look a bit washed out.
Back in the day, when Kodachrome was often my film of choice, I would routinely expose it at EI 80 instead of 64. The extra third of a stop helped a bit with shutter speeds, but it also gave a noticeable improvement to color saturation.
As for my aversion to Fuji's Superia 400, I guess I need to go out and shoot some more of it. What I recall most about it, though, was the clumpiness of the grain at higher magnifications -- clumpiness I wasn't used to seeing with slower speed films. Maybe what I should do is shoot it at ISO 320 and see if that has an effect. I wouldn't be surprised if it did.
My test on Kodak Ektar 100 -and all the other films I have tested, allows me to shoot a scene in range of latitudes knowing what I can get out of the frame using my metering technique and workflow. For instance I came upon a scene that my meter recommended a 1/60 shutter speed but I wanted 1/4 in order to slow the water down. I didn't have an ND filter with me but I know that is well within the tolerance of Kodak Ektar 100 so I shot it at 1/4 and got this out of it with very little exposure compensation done during scan and simple levels adjustments in post.
With regards to Fuji Superia 400, it is not my preferred film at 400 but I would certainly not say that it's grain is anywhere near clumpy. How are you evaluating the grain? Have you you used Neat Image or Noise Ninja for grain reduction?
BTW, in my previous post I provided a full 4000dpi scan of that frame of Fuji Superia 400 with lots of sky for better evaluation of grain and no grain reduction. Anything past 100% view will show more JPEG artifacting - squarish patterns, and should not to be mistaken for grain. I'd post the TIF file but it would be about a 60Meg file. I also have 20" X 30" optically printed poster of most of the films that I use for comparison to my scans.