Explore Scientific 92° 12mm Long Eye Relief Waterproof Eyepiece - 2"

A Hyper-Wide 92° Field

You may be startled at the wide expanse of inky black sky the first time you look through a 92° Series eyepiece, and may even forget there is an eyepiece between you and the universe. With an apparent field close to the maximum for hyper-wide designs, objects are easier to locate, and in a non-driven telescope an object stays in the field a very long time before you need to adjust.

Hyper-wide eyepieces also make averted vision easy: looking slightly to the side of a faint object puts its light on a part of your eye that is more sensitive to light, allowing you to see fainter images.

Engineered for Comfort: Long Eye Relief at 12mm

The 92° Series has an extra long eye relief design.

Long eye relief lets you keep your eye at a relaxed distance from the lens.

Advanced Optical Design: 8 Elements in 6 Groups

The 12mm uses 8 elements in 6 groups. It has an optimized optical design, exotic glass combinations and durable coatings.

• Fully Multi-Coated Optics: All optics are fully multi-coated.
• Edge-Blackened Lenses: The lens edges are blackened; this and the coatings produce maximum contrast.

Built for the Field: Argon-Purged Waterproofing

Each eyepiece is O-ring sealed and purged with an inert gas to create a waterproof environment, with a waterproof, fog-proof housing.

Physical Characteristics: A 2-Inch Barrel Weighing 1089 g

The eyepiece needs a 2" focuser. A tapered 2" barrel adds extra security. It measures 152mm long and 70mm wide.

At a weight of 1089 g (2.4 lbs), this is a substantial ocular. Expect to rebalance the telescope when switching to or from much lighter 1.25" eyepieces.

Magnification and Targets for the 12mm Focal Length

To calculate the magnification, simply divide your telescope's focal length by 12mm. For example, in a telescope with a 2000mm focal length, this eyepiece provides 167x magnification.

Other examples: 50x at 600mm, 100x at 1200mm. For more power, Explore Scientific's 2" Focal Extenders (FE02-020 2x, FE03-020 3x) multiply the magnification; the catalog lists optional focal extenders for the 92° Series.