Saw this is an older thread, but will probably still be looked at a lot with the excellent side by side comparison on the scopes by BigSur

For what it's worth, my eyes seem to be really picky on what works for me. I leave the eyepiece extended on the ED50 and can use the full zoom, been using mine for 2 seasons now. The Zeiss Victory FLT binos fit me also, I use them one click short of being fully extended and they fit me perfect. Most versions I tried including the Cabelas Euros, Vortex Razor, Zen Ray Prime, and Minox HG left me wanting to extend them one more click. Maybe this will help someone having a similar problem with optics.