Stargazing owl eyes, 2x magnification astronomy binoculars

Here is a 3D print of my design: Mision binoculars for easy stargazing.
Comparable to Vixen Owl eyes, but cheaper.

These glasses give you a 4x light income to your vision when stargazing, without the loosing effect of 8 or 10x binoculars. This pushes the limit visual magnitude of stars and DSO to +2 from your local limiti magnitude.

These glasses are based on this chinese cheap teleconverters:
https://www.ebay.fr/itm/52mm-2X-Magnification-Telephoto-Tele-Converter-Lens-for-Digital-SLR-Cam