Explore Scientific 17mm 92° Series Eyepiece - 2"
This Explore Scientific 17 mm 92° Series™ eyepiece is one of their hyper-wide class oculars that can transform your visual astronomy experience. You may be startled at the amazingly wide expanse of inky black sky you behold the first time you bring your eye to a 92° Series eyepiece. After a while, you may even forget that you have an eyepiece between you and the universe!
Having an apparent field of view that is close to the maximum for hyper-wide eyepiece design, objects are not only easier to locate, but for non-driven telescopes the object will stay in the field of view for a very long time before any adjustments need to be made.
Another great benefit of hyper-wide eyepieces is the ease with which you can gaze, not directly at an object, but slightly to either side. This skill, called using averted vision, is especially helpful when observing faint objects, because using averted vision places the image on a part of your eye that is more sensitive to light, thus allowing you to see fainter objects.
This 92° Series™ eyepiece from Explore Scientific has a focal length of 17 mm, an apparent field of view of 92°, has a long eye relief for comfortable viewing even for those wearing glasses, and it is Argon gas purged to eliminate fogging problems. It is also waterproof. All optical surfaces are fully multi-coated for the highest transmission performance. It has a 2" standard barrel.
|Description:||17 mm 92° Series Argon-Purged Waterproof Eyepiece|
|Focal Length:||17 mm|
|Weight:||44.8 oz / 2.8 lb / 1270 grams|
|Eye Relief:||20.02 mm|
|Field Stop Diameter:||27.46 mm|
|Eyecup Included:||Yes, soft rubber|