The Explore Scientific 92° Argon 17mm LER Eyepiece is the first in the line of Explore Scientific's 92° range of Argon-purged eyepieces. These eyepieces are designed to balance the modern demands of field sharpness over a wide apparent field, with long eye relief, which is of particular benefit to those who wear glasses while observing.
Whilst many advanced observers may be getting rather used to the joys of super-wide apparent field eyepieces, we're sure that this is one of the sharpest, yet most comfortable and immersive eyepieces we've ever experienced - it really is a joy to use.
The 8 lens (arranged in 6 groups) design of this eyepiece yields superbly corrected views and the 22mm eye relief and wide occular diameter combine to deliver a fantastic user experience. The 17mm focal length will be a good fit for many different telescope designs and focal ratios. Those who have lower focal ratio instruments will adore the widefield deep sky views this eyepiece delivers. Whilst owners of 10, 12 and 14-inch SCT or RC telescopes, who are looking for higher power planetary and lunar magnifications will love what this eyepiece does for their particular instruments.
Explore Scientific's EMD coatings provide exceptional contrast and combat internal reflections extremely efficiently. The eyepiece has internal baffles and entirely blackened internal fittings which complement the EMD coatings.
The Explore Scientific 92° Argon 17mm LE Eyepiece is Argon purged and completely waterproof - so is impervious to dirt, moisture and fungal ingress.
Net weight (without access.) (g) 1100
Total length (mm) 148
Focal length (mm) 17
Field diaphragm (virtual, mm) 27.4
Apparent field of view (degrees) 92
Eyepiece Barrel Diameter (mm) 50.8 (2-inch)
Length of the eyepiece barrel (mm) 39
Eyecups Rubber eyecups, foldable
Eye relief (mm) 22
Diameter (mm) 72