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Message: <blockquote data-quote="Omid" data-source="post: 3643388" data-attributes="member: 16724">Hello Lars,Thank you very much for taking time and testing various configurations according to my ideas. Your observations actually confirm my own observations and experiments. They show what this technique can achieve and what the challenges are. If I summarize your observations:a) Diverging the axes of view: You confirmed that when viewing long-distance objects, the horizontal field of view of the binoculars is increased while the "overlap" between the left and right fields of view is no longer 100%. There will be overlap only at the medial portion of the fields of view so stereopsis (3D vision or depth Perception) only happens at this portion. Well, this is perfectly fine and exactly what happens in normal (un-aided) human vision. You focus your gaze at an object directly in front of you and the side of your fields of view don't overlap, they just give situational awareness and detecting motion.     This option is obviously not suited for viewing near objects. The opposite trick (converging the axes of view) is to be used here. Your observations confirm this.B) Converging the axes of view: Here too you confirmed the validity of the concept: "At very close distance: A relaxed view with a perceived increase of magnification, similar to the view of a reverse-porro". That's exactly what I had claimed: Positioning the prisms in front of the objectives in the converging configuration will allow binocular viewing of very close objects. Your other observations regarding color fringing, etc are all valid too. But as you noted they can be mitigated. Note also that we can put prisms both in front of the objectives and after the eyepieces. The second prisms can simply cancel out the color fringing and other undesirable effects of the frontal prisms (magnification of the binocular must be considered in choosing prism adopters).Finally, I have achieved another great goal: I inspired you and a few others here to think outside the box and discover new possibilities in designing binocular instruments. As you discovered for yourself, a similar effect can be produced by laterally shifting the field stop of the binoculars. I had discovered this too and I have pending patents on this variation and several other variations (e.g. binoculars with tilted image planes).The topic of optimal configuration for binocular vision is still open to exploration. All has not been discovered yet. You are now <a href="http://www.birdforum.net/showpost.php?p=3631946&postcount=52" target="_blank">in the arena</a>!  Let's explore further together and if we discover some other interesting configurations, I'll be happy to file for a joint patent application on the the topic.Thank you very much for your efforts again,-Omid</blockquote>

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