Hi ... Does anyone know if the Celestron Regal F-100 zoom eyepiece can be used in the Ultima 100 ED scope. I sold the Regal body & kept the eyepiece. The specs seem to be the same between the two but I cant tell looking at the pictures if the Ultima zoom can just be removed & the other put back in. I really liked the Regal but it had a few things that really bugged me, like the problem with finding eyepieces & that coarse/fine focusing. After comparing the zoom to the big Pentax SMC , I liked the features of the Regal zoom much better & felt it gave up nothing optically to the Pentax other than not being waterproof. I even like it better in my pentax 65 Ed II having the same 16- 48x power range. Now I have a chance to get a Ultima ED for a really good price but would really like to use the Regal highend zoom on it instead... gwen