best eyepieces

what is the easiest eyepiece for finding the sweet spot. I find that beginners and guest at star parties have trouble finding the field of view.

I am not exactly sure what you are asking. But I teach astronomy at the high school level. Usually students have no problem a low power ep in the 25mm range that has a large exit pupal and long eye relief. For higher power views of the moon and planets, I generally us a 15mm Ultrascopic that gives 80x in my scope. Students have little trouble with that after using the lower power ep. But I think definitely stay away from eyepieces under 10mm. Use a barlow instead for higher powers since that usually seems to increase eye relief.