The Tele Vue 2" Tunable Top with 1.25" Adapter is normally included with the Tele Vue 2" Paracorr Type 2 (VIP-2010). It can be used in along with the Tele Vue VISA, or Visual / Imaging System Adapter (AVI-3200) to utilize the 3" BIG Paracorr (VIP-3010) for visual use.

To use the 3" BIG Paracorr visually, you remove the flange from the top and attach the Visual/Imaging System Adapter (VISA), followed by the 2" Tunable Top. If you are using 2" eyepieces, you can stop there, otherwise, slide the 2" to 1.25" adapter into place.