Image of the day

Captured by
Mike Harden

Rosette Nebula NGC 2238

My Account

New to Astromart?

Register an account...

Need Help?

Why the price difference?

Started by gyrocopter24, 10/06/2010 10:48AM
Posted 10/06/2010 10:48AM | Edited 10/06/2010 11:10AM Opening Post
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
Posted 10/06/2010 11:49AM #1
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.