If you're a new telescope user, you might be happy using the default eyepiece(s) that your telescope comes with. But upgrading to something better can make a world of difference, opening up your ...

for a 50mm lens and -1 diopter, which is truly excellent. The viewfinder eyepiece has an eyepoint of approximately 22mm from the eyepiece lens center. This is a higher than average eyepoint ...