Iphone 8 spotting scope mount.

thingiverse

This is a straightforward iPhone-to-spotting scope adapter. It's designed to fit an iPhone 8 and a Bariska spotting scope, with the eyepiece diameter roughly measuring 1.525 inches. I made the inner sleeve diameter 1.55 inches to allow for some extra room. The final print was a bit tight on both the scope and the phone, requiring a bit of sanding to get the fit just right. This might have been due to my printer's general crankiness (A8s can be quite passive-aggressive), so you may want to scale it up by a couple of percent just in case. It's easier to snug the fit up than it is to loosen it, after all. I couldn't get a picture of the adapter in use because I only have my phone as a camera, but it's pretty straightforward. The center slot allows you to add a band around the middle for extra security. Mine was already pretty snug, so I left the band off while standing still and waiting for birds to appear.