Yeah, I've seen a few websites discussing stereography and there are definitely commercially-available stereogram viewers that seem aimed mostly at prints and digital (on a monitor) images as they speak of image sizes of 100mm to 300mm. The Owl does look quite suitable in its dimensions but I'm not convinced by cheap plastic lenses. Does anyone know how many dioptres they are?

I want more magnification than that. Yes, each image is 6x7 - I've been shooting with an RZ and a lateral macro rail.