I have ordered several digiscopes in an attempt to help a young disabled hunter. This is for a low powered crossbow scope, and when utilizing it if I zoom in it loses image because it's an iphone with 3 camera lenses... I think the 1x camera lens is the one that most these adapters utilize...
Nothing better in my opinion that a Medium https://www.tandkhunting.com/products/gen-2-binocular-harness-1.. They are fully customizable, veteran owned and 100% USA made. Tyler is a great dude to work with, and have been so happy with mine.