On Glass Phone Adapter Kit for Spotting Scopes and Binoculars
Free shipping when you add any second item.
Everything you need to mount a phone to a spotting scope or binocular eyepiece: the On Glass Adapter Ring with MagTab, and the Optic Spacer that fits your optic all in one kit. We recommend adding the MagSafe Backer for ease of removability for compatible phones and cases.
Which spacer size?
Not sure of your size? Find your spacer lists over 400 binoculars and spotting scopes with the spacer each one takes.
Measure the outside diameter of your eyepiece with a ruler or calipers, then choose the spacer whose range it falls in. If it sits between two ranges, or you are not sure, get in touch before you order and we will check it for you.
| Spacer | Eyepiece outside diameter | Inches |
|---|---|---|
| Alpha | 39.4 to 41.7 mm | 1.55 to 1.64 in |
| Bravo | 41.9 to 44.2 mm | 1.65 to 1.74 in |
| Charlie | 44.5 to 46.7 mm | 1.75 to 1.84 in |
| Delta | 47.0 to 49.3 mm | 1.85 to 1.94 in |
| Echo | 49.5 to 51.8 mm | 1.95 to 2.04 in |
| Foxtrot | 52.1 to 54.4 mm | 2.05 to 2.14 in |
| Gulf | 54.6 to 56.9 mm | 2.15 to 2.24 in |
| Hotel | 57.2 to 59.4 mm | 2.25 to 2.34 in |
In the kit
- Adapter Ring with MagTab
- One Optic Spacer, in the size you choose
- Alignment tool included
Why It Works
- Self-centring: every time you snap on, you are aligned
- Fits spotting scopes and some binoculars
- Universal phone compatibility: no proprietary case required
One kit, one system, everything you need to start capturing what you see through On Glass.
The MagSafe Backer and MagCover are sold separately.
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