DESCRIPTION
The longest focal length in the 52° Series with the longest eye relief, the 40mm is also the only 2.0-inch O.D. eyepiece in this series. Explore Scientific now has three 40mm eyepieces in its collection, the other two are the 40mm 62° Series, and the 40mm 68° Series. At this focal length, this eyepiece is generally reserved for deep sky observers who challenge themselves to observe near the faintest observable limit of their telescopes. The huge true field of view is perfect for deep sky objects like the Andromeda Galaxy, the Rosette Nebula, as well as large star clusters, and comets.

Comfort, Quality, Value. The Explore Scientific 52° LER Series mid-range focal length eyepieces are excellent flat-field multi-element oculars that can transform your visual astronomy experience. With an apparent field of view of 52 degrees, these eyepieces offer incredible value in a very nice eyepiece. Expect exceptional quality and value versus a comparably priced Plossl.  

These eyepieces are the choice for observers wearing glasses - with excellent performance and durability. The rubber inlet and the foldable eyecups make handling and using in the field easy. The patented EMD-coating produces high contrast images and prevents reflexes and ghosting. The argon purging effectively prevents internal fogging, and you don´t have to deal with dirt, fungus or cleansing fluids getting between the lenses. The eyepieces are sealed - this makes sure you will be able to enjoy these eyepieces for many years to come.
 
SPECIFICATIONS
Large eye distance, large field and great image sharpness
Excellent viewing position for people with glasses
Excellent field sharpness even with fast optics
52° apparent field of view
Argon-purging prevents internal fogging, the sealing facilitates cleaning
Patented EMD-coating to maximize contrast
Blackened lens edges to avoid reflexes
All eyepieces of this series are parfocal
Stainless steel barrel with conical security cutoff
Dust covers and protective bag included
 
SCOPE OF DELIVERY
52° Eyepiece
Dust covers
Protective bag
 
HIGHLIGHTS
Large eye distance and great image sharpness
Excellent viewing position for people with glasses
Excellent field sharpness even with fast optics
52° apparent field of view
Patented EMD"-coating to maximize contrast
Blackened lens edges to avoid reflexes
Argon-purging prevents internal fogging, the sealing facilitates cleaning
Stainless steel barrel with conical security cutoff
Dust covers and protective bag included

TELESCOPE SPECIFICATION

OPTICAL SPECIFICATIONS
Focal length	40 mm
Apparent field of view	52 degrees
GENERAL TECHNICAL DATA
Eyecups	Rubber eyecups, foldable
Interpupilar distance min.	27.1 mm
Extended warranty	10 years
DIMENSIONS & WEIGHTS
Total length	103 mm
Net Weight total (incl. accessories)	390 g
Eyepiece Barrel Diameter	50.8 mm / 2 inch

Instructions for use in ENGLISH

Download Data Sheet of Explore Scientific Eyepieces in PDF format.