Linhof Multifocus Optical Finder
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This is an extremely hand device. It covers lenses from 90 mm to 360 mm, and allows you to preview what the field of view will be for each focal length. I use it both off the camera to determine what the best location for the camera and tripod will be, as well as on the tripod mounted camera to keep track of what may be moving in or out of the frame without removing film as I wait to make the exposure, i.e clouds. It is a great time saving device allowing me to preview what the subject will look like through the camera without having to spend the time to actually set up the camera. This device will save several minutes when setting up a large format camera.