MagView Gear S1 Spotting Scope Adapter mount is the simplest system I have ever used. It uses a magnetized ring with multiple spacers which are included, to fit your favorite spotting scope's eyepiece. Also included, is a thin phone plate with adhesive that attaches the plate to the back of your phone or phone case. The adapter mount magnet will strongly hold your phone in place to the S1 Mount. A drawback of the S1 is after mounting the S1 Adapter to the Swarovski, I no longer could use my eyepiece cover which protects my spotting scope from scratches, dings, grit and grime.
MagView B1 Binocular Adapter
The B1 is an adapter specifically for your binoculars. I watched the helpful video on installation and was up and running in minutes. The magnet is attached to one eyecup and the phone camera uses the opposite side to look through. The B1 fits eyepiece sizes 38.5mm-43mm (1.5in-1.7in), but MagView are planning on coming out with a B1XL for anything larger than that.
My Thoughts
I've only had the S1 & B1 for a ten day hunting trip this season. As it seems I will be using them a lot more. When sheep hunting ounces count, and having gear in the lightest weight possible with the features needed to do the job will always make it into my pack.
Pros
Simple quick attachment using magnets providing a solid interface.
Lightweight & doesn't add addition bulk.
Provided QR Code for video instructions.
MagView App available for Android and iPhone.
Cons
S1 Not able to use with spotting scope case cover covering the eyepiece.
B1 Is not currently compatible with all eye cups.
MAGVIEW Phone Plate is not compatible with wireless phone chargers.