iPhone 7 Telescope Adapter
thingiverse
This adapter is specifically designed to fit a 42mm rubber eyepiece, and I'm using an iPhone 7 as the test smartphone. Notably, the mounting knobs on this adapter have a circle diameter of 40mm, which means that other eyepiece adapters can be created with knob diameters of 3mm. This adapter is compatible with most Swarovski binoculars and field glasses.
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