Celestron Ultima Edge 18mm Flat Field Eyepiece 1.25-inch

The Celestron Ultima Edge 18mm Flat Field Eyepiece for 1.25-inch focusers provides excellent light transmission from a fully multi-coated, 8-element lens design with wide 65° apparent field of view.

 

Celestron Ultima Edge 18mm Flat Field Eyepiece 1.25-inch Summary

• 18mm parfocal Ultra Flat Field eyepiece designed for 1.25” focusers
• Incredibly crisp views from center to edge of field
• Fully multi-coated, 8-element lens design for excellent light transmission
• Wide 65° apparent field of view allows you to see more of the night sky
• Generous 20mm eye relief and fold-down rubber eyeguard for comfortable viewing with or without eyeglasses
• Molded rubber grip ring for non-slip handling

See the whole picture with Ultima Edge. These flat-field eyepieces were designed to provide an ultra-sharp, ultra-clear, crisp image from the center all the way to the edge of the field of view. The 18mm Ultima Edge eyepiece features fully multi-coated optics and an 8- element lens design, maximizing light transmission.

The Ultima Edge 18mm has a generous 65° field of view perfect for viewing planets, stars and the Moon’s surface.  This eyepiece provides higher-powered magnification, perfect for those times when you want to get up close to smaller objects.

Body

The 18mm Ultima Edge eyepiece’s main housing is machined from high grade aluminum with a black anodized outer surface.

Its 1.25″ mounting barrel is internally threaded to accept standard 1.25″ filters and adapters. It is compatible with 1.25” star diagonals and focusers. On the exterior of the eyepiece, you will find a uniquely designed, molded rubber grip ring for non-slip handling during observing sessions.

Viewing through the 18mm Ultima Edge eyepiece is comfortable for both eyeglass wearers and non-eyeglass wearers alike, thanks to the rubber eyecups and long eye relief of 20mm.

Convenient Parfocal Design

Spend more time observing and less time focusing! When you buy more than one Ultima Edge eyepiece, you can switch between them without refocusing thanks to their parfocal design. With a set of Ultima Edge eyepieces in your kit, you’ll be able to enjoy a wide range of high and low power views—and switch between them quickly and easily. That means you can get more out of every observing session.

NOTE: Ultima Edge 24mm is not a parfocal eyepiece. Ultima Edge eyepieces are only parfocal within the line and do not maintain focus when swapped with parfocal eyepieces from other brands or series.

 

Specifications

Barrel Size Diameter:	1.25″ (31.75mm)
Focal Length:	18mm (.71″)
Field Stop Diameter:	23.4mm (.93″)
Apparent Field of View:	65°
Optical Design:	Proprietary
Number of Lens Elements:	8
Number of Lens Groups:	5
Optical Coatings:	Fully Multi-Coated
Eye Relief:	20mm (.78″)
Parfocal:	Yes
Filter Threads:	1.25″ (M28.5X0.6)
Eye Guard:	Yes- roll up
Body Material:	Aluminum
Weight:	7.4 oz (209.7 g)
Dimensions:	81mm x 51mm x 51mm (3.19″ x 2″ x 2″)