Sky-Watcher Emerald 16mm 82° 2" Eyepiece

Product Overview

The Sky-Watcher Emerald 16mm 82° 2-inch Eyepiece is an ultra-wide visual astronomy eyepiece designed for immersive mid-power observing. It offers a wide 82° apparent field of view, a 7-element optical design, 14mm eye relief, filter threading, all-metal construction, and an included carry case.

Who Is This Product Best For?

This eyepiece is best for visual observers who want a wider, more immersive view for star clusters, nebulae, lunar observing, and general-purpose deep-sky viewing. It is a strong upgrade for observers moving beyond standard kit eyepieces and works well for beginner-to-intermediate users who want a premium-feeling ultra-wide field.

Why Choose This Product?

• Ultra-wide 82° field: Gives a panoramic view and helps keep objects in the field longer on manual mounts.
• 16mm focal length: A useful mid-power option for many telescopes.
• 2-inch format: Designed for telescopes and diagonals that accept 2-inch eyepieces.
• 14mm eye relief: More comfortable than many short focal length ultra-wide eyepieces.
• All-metal construction: Built for repeated field use and a solid feel in hand.

Recommended Uses

• Open clusters, nebulae, and brighter galaxies.
• Lunar observing at moderate magnification.
• General-purpose deep-sky observing.
• Manual Dobsonian and alt-az users who benefit from a wider apparent field.
• Visual observing with compatible 2-inch filters.

Compatibility and Accessory Notes

The 16mm Emerald uses a 2-inch barrel and is threaded for compatible filters. It should be used with telescopes, focusers, and diagonals that accept 2-inch eyepieces. Final magnification and true field of view depend on the telescope focal length and optical design.

Important Limitations

• Requires 2-inch compatibility: This eyepiece is not intended for telescopes limited to 1.25-inch eyepieces.
• Visual use only: This is an eyepiece for observing, not a camera adapter.
• Balance considerations: Larger 2-inch eyepieces may require rebalance on some small telescopes.

Frequently Asked Questions

Is this eyepiece good for beginners?

Yes, if the telescope accepts 2-inch eyepieces. It is a good upgrade for observers who want a wider view than standard eyepieces provide.

What is it best used for?

It is best for mid-power visual observing of clusters, nebulae, the Moon, and many general deep-sky targets.

Will it fit my telescope?

It fits telescopes that accept standard 2-inch eyepieces.

Can I use filters with it?

Yes. The eyepiece is threaded for compatible filters.

When should I choose another focal length?

Choose the 9mm for higher magnification or the 22mm for lower magnification and a wider true field.

Our Recommendation

Ontario Telescope recommends the Sky-Watcher Emerald 16mm 82° eyepiece as a versatile mid-power ultra-wide eyepiece for observers with 2-inch capable telescopes. It is a useful step up from standard kit eyepieces when a wider, more immersive field is the goal.