This is the easel and the case, positioned to load the film. There are masks that fit in the opening to make different size prints, 2x3, 3x5, 4x5, 5x7. The knobs slide the single size easel different distances inside the case, via a series of stops.The 1620 version is slightly different, thus my confusion. There is no 'SHIFT' control on the larger unit, so I am thinking I will have to flip the paper, and also the negative if I want multiples all oriented the same direction.
Here is a print from the 810 easel, 8 images on one page, all oriented the same way. I'm aiming to get this on 1620 paper, or 32 images on 16x20 paper!