For your Mag85 you will want the borofloat, a type of Pyrex lens. The UCL is very nice but is coated with anti reflection clear compound, like the one in the new glasses or the ones they put in binoculars and scopes to enhance the light transmission. The heat of the 1185 is too much and will cook a halo in the coating.
UCL are fine for less demanding task (less heat)
hope it helps
Juan C.