Updated OWL 1 (Version 2) features a wider aperture in the back plate (increased from 14cm to 15.5cm) making it compatible with viewing larger format Stereocards and for use with iPads The OWL, designed by Queen Guitarist Brian May, is a unique, high quality, stereo focusing viewer, which packs into a space only 1/3 inch thick, yet assembles in 15 seconds into a rigid precision instrument which is equally at home sitting on a page to view stereo illustrations in a book.
It used in the hand as the perfect viewer for stereo cards - classic or modern.
It has extra large lenses so anyone can use it regardless of eye spacing.