To create the collection, I used the Zoom Lock Tool. You can use it too. 1) Open up one of your collections, 2) open up an image within that collection, 3) use the zoom tools to zoom in and out and your cursor to reposition the image, 4) click the checkbox next to the zoom tools, 5) click done. Then save your collection to reset the thumbnail images. When others view your collection, that image will load at the zoom level and the position you set (although they will still be able to zoom in and out of the image).