Why the price difference?

Why is there such a differences in prices between 1.25 and 2" eyepieces? Meade 2" is roughly 50-$100 difference in the use market and similar price from the new vendors. TV Powermate 2x 1.25 used is about $120, compared to $200+ for a 2"

What is a compression ring? is that like an adapter for a 1.25? on a 2"

Thanks to everyone

-Terry

Terry swan said:
Why is there such a differences in prices between 1.25 and 2" eyepieces? Meade 2" is roughly 50-$100 difference in the use market and similar price from the new vendors. TV Powermate 2x 1.25 used is about $120, compared to $200+ for a 2"

Going from 1.25 to 2 is a 62.5% increase in diameter, but it's a 256% increase in surface area!

Probably harder to make defect free stuff that's larger too.

Terry swan said:
What is a compression ring? is that like an adapter for a 1.25? on a 2"

Essentially, it allows you to capture and hold your eyepiece into your diagonal, or powermate, or what evere w/o ever having a set-screw contact the eye-piece barrel which could potentially mar the eyepiece barrel. Think of it as a ring clamp that holds your EP in place all the way around it's barrel instead of single point of contact like with a traditional set-screw.