Okay, so I walked the Grist Mill Trail from its head to swinging bridge, then walked up to the "impressive" part of cascade falls.
Before I set out on that, I picked up some Ilford Delta 100 and 400 film and a 52mm red filter. Armed with both my *ist DL and MX around my neck (which must have made me look like the most phenomenal nerd ever), I set out with a misloaded roll of color film and the 43 on the MX, and the 50-200 on the DL. Nothing exciting from the digital, but I wanted to try to set up a "black and white" shot with the red filter on a digital camera. That's what you see above. Seeing as how I'm using a quarter of the photosites on the sensor, it should come as no surprise that detail takes a pretty good hit using this method. I already knew that would happen, but it came as a surprise that the meter can no longer be trusted - the camera doesn't know the difference between film and the digital sensor, so it meters down three stops even though the red channel stays just as sensitive to the light coming in. Blah blah blah translation - trusting the meter results in an overexposed shot in the amount of the color filter's exposure factor: in this case, about 2 stops, give or take.
Figuring out a conversion workflow (because I KNEW I needed to shoot raw to do this) was an interesting challenge. I figured out that if you go to the "calibration" tab in Adobe Camera Raw and desaturate the reds and greens completely, getting a monochrome image is just adjusting the blue saturation down to the point where all three histograms line up perfectly. Then you go back to the first tab, bump up exposure between 2.5 and 3.5 stops, and fiddle with shadows until you get the overall contrast you're looking for.
At any rate, I'm taking the film in to have it sent off tomorrow; hopefully, sometime this week, I get the results of that back.