Slot canyons (Antelope Canyon) near Page (the "$6million dollar photo" was taken at one of the locations in the video.
Also recognised Horseshoe Bend and "The Wave".
Lake Powell, Horseshoe Bend, the Wave and other areas of Coyote Buttes, Antelope Canyon, Zion National Park - generally the Grand Staircase-Escalante and surrounding areas around the UT-AZ border (Kanab-Page - our backyard!).
these type of gels are for lights only and not for lenses. they're not optically pure by any standard, and will degrade image quality. better to stick with kodak wratten filters or lee polyester filters, especially on a $3000 lens.
You do not want those Lee filters; the filters you have been looking for, padawan, are Kodak Wratten gel filters, which I think are now designated as Wratten II filters, and are sold by Kodak's cinema division. You can probably get them on-line or at a serious pro photo/video/cinema supply house in your area. Ebay sells thousands of used original Wratten filters, but, of course, one can't verify their true condition. These Wrattens are specifically made for camera, rather than lighting, use, are optically pure and spectrally about the best corrected filters available. They were easily the standard of the pro industry in film days gone by, and all the pros I ever knew used these rather than glass or resin filters, except when not practical, such as in cases of easily used graduated filters.
David, I purchased the ND 3.0 version of the Kodak Wratten 2 filter from B&H Photo. It should be here tomorrow and it looks like the lens will be in stock on 2/26. I'll let you guys know how it works out.