Used Tele Vue 2x Barlow 1-1/4" Hand Controller with a coma-free field over

with a coma-free field over 3° wide

While a red dot can obstruct your desired target

It will be parfocal with both 2" and 1¼" eyepieces in this application

4 1/2" Apo Refractor

Messier 101

Used Tele Vue 2x Barlow 1-1/4" Hand Controller with a coma-free field overCondition: This is a used 2x 1. 25" Tele Vue Barlow in excellent condition. The optics are clean and the body is unmarked. It comes with its original caps and box! Description Tele Vue Barlows reduce aberrations to below the airy disc in an f 4 system and lay to rest the popular myth of the "degrading Barlow." Properly designed Barlows do wonderful things: They amplify power, slow the telescope's f # (improving eyepiece sharpness), and give designers