henry link
Well-known member
Here's a link to a 2013 thread on the subject of the then new Leica Perger prism rangefinder binoculars, including a link to the US patent application for the Perger prism in post #9. Some claims of extra 3-D were made from the start, apparently based on nothing more than a slightly wider objective baseline for the new Perger Geovids compared to the older Uppendahl Geovids.
www.birdforum.net
As I recall the Perger can be configured for a range off-sets, including zero or almost zero, but I think the aperture between the prisms shrinks at very small offsets restricting the unvignetted FOV.

19/11/2012 New LEICA GEOVID
Dear friends here in Italy is already November 19th. For this reason, I can publish this preview.:-) Today will be presented the new Leica Geovid. Unfortunately, it characteristics will be published in December. Best Regard from Italy Piergiovanni

As I recall the Perger can be configured for a range off-sets, including zero or almost zero, but I think the aperture between the prisms shrinks at very small offsets restricting the unvignetted FOV.
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