Hi there...I did own this eyepiece,made by swaro for Meade,when i had the Pentax PF65,..It was my first zoom and it was very nice to use..You can probably find some posts on the eyepiece,since I think i wrote something about this combo a while back...It does not reach infinity at 20X for a hair,but with a small modification(a tiny niche carved in the field stop)this can be solved..Now,I dont reccommend to do this,since this eyepieces are valuable,collectable to an extend,and performance ,if somehow better,is really ,really close to the famous vixen zoom( a clone of the swaro zoom really),that by the way,does focus to infinity at all magnifications...Nor the swaro,nor the vixen zooms are waterproof