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due to popular demand, im kicking off the ENG section here...
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: this_feature_currently_requires_accessing_site_using_safari
Phil
Maybe I misunderstand what you are looking to achieve, but SLR zooms tend not to hold focus when you zoom in or out. Perhaps the Nikon 17-35mm does - I don't know for sure.
Assuming it doesn't, you would need to refocus whenever you changed focal length, making "remote" operation difficult.
I could see a benefit where you could change focal length with a rocker switch with one hand while changing focus with the other, but it would take a great deal of skill to hold focus while doing this.