Epson's lens for the 1985WU is a manual zoom lens with a 1.6:1 zoom ratio. This is significantly more zoom - and therefore placement flexibility, than most smaller portable and fixed install projectors many of which have 1.2:1 or 1.3:1 zooms. This makes it easier to place a 1985 in your facility.
Separate, but worth noting, this Epson has a feature called Screen Fit which will allow the projector to resize the image to fit the screen you are using. (Press the button and it puts up a yellow border. Set the projector so that the border is slightly larger than the screen, and outside the screen area. Press again, and the image gets resized to fit. Done! You most likely wouldn't need that if mounting, but if moving the projector from site to site, it's quick. Not that normally adjusting zoom and elevation takes more than a few seconds.
The lens has a lens cover to protect it when not in use, and the lens controls as mentioned are on top. The optics are very respectable with both focus and brightness being very good from center to edge. Yes, the projector isn't as bright in the corners as the center, but the drop off is slight, less than most. There is no vertical or optical lens shift, but of course there is keystone correction, as well as other features like the Screen Fit just described.