I have also used a 90mm and 210. 210 gives good coverage with detail. One thing to be prepared for is the wind. It gets silly at sunset and sunrise. So be sure to shield camera during exposures. I typically am anywhere from 1 sec to several minutes almost exclusively at f/32. Sometimes f/22 and rarely below that.
I also use reverse grad nd filter for most sunrise and sunset images. 3 stops (0.9 filter factor). Make sure it is quality filter if you use it and don't place it to low or you will overly darken the tops of the cliffs. I place mine so the top of cliffs are just barely darkened slightly to almost not darkened at all. It is kind of an art.
For your slide film make sure you get enough exposure in the shadow areas. Typical with sunrise and sunset there will be a cliff or two that "look" proper, but in reality are about 2 stops under exposed compared to 90% of the rest of the scene. With bw you can usually compensate for this in development but with color neg and slide almost impossible to correct.
If cloudy look for light rays in clouds and shadows on canyon and on canyon floor and cliff walls, especially if cloudy. You are looking for patterns. Also, shit sunset and sunrise judiciously and be patient. Sometimes a dud. But there is also a lot to image after sun goes down a few minutes ( look for colors in Sky to brighten up). Sunrise just before and during its peaking out from behind the rocks is great and only the first couple minutes after it emerges into full view. Quickly things get ugly after that.
There is probably not a lot of snow on the sides of canyon currently, it snowed good and a lot on everything but the Canyon walls. Walking the Rim Trail, I finally found pristine snow scene. People just love to screw up potential scenes of wonder. Here are couple IR be images from my 5DMKIII. Waiting to develop my film.
https://flic.kr/p/2i5Gt89
https://flic.kr/p/2i5HvJA
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