Orion On Edge Planetary 9mm Eyepiece

Description

Orion 9mm On Edge Planetary Eyepiece.
Sellin
g this because I upgraded but this is a great eyepiece for the price. I used it to look at Saturn and Jupiter all last summer with a 150mm Orion Mak. It was my favorite eyepiece and I used this more than all my other eyepieces. I'm only parting with it to cover my upgrade to a 13mm Baader Lens with a wider field of view. Hope this finds a good home.
Here is what Orion says about it.
9mm focal length Orion Edge-On 1.25" telescope eyepiece designed for exceptional planetary and lunar viewing
Flat field design ensures sharp focus out to the edge of the eyepiece's wide 55deg apparent field of view
Barrel distortion and field curvature commonly seen in standard eyepiece designs are gone
9mm eyepiece has long 20mm eye relief for comfortable viewing even with eyeglasses on
The amazingly affordable 9mm Edge-On eyepiece won't have you on edge financially!
Orion Edge-On Planetary telescope eyepieces bring flat-field performance to solar system viewing in the form of six medium- and high-magnification focal lengths. Each eyepiece employs a sophisticated 7-element lens design reminiscent of exotic, high-priced oculars. This design renders an optically flat image that's sharply focused from center to edge of the wide 55-degree apparent field of view. The barrel distortion and field curvature aberrations common in standard eyepiece designs are virtually gone.
Orion Edge-On Planetary telescope eyepieces let you push the power, whether you're canvassing the lunar terminator or studying the Jovian cloud belts. The optics are fully multi-coated for high light transmission, and each eyepiece has 20mm eye relief for viewing comfort. Other nice touches: blackened lens edges, pop-down rubber eyeguards, and 1.25" barrels threaded for filters.
Refraction astronomical telescope double objective Lens group 154mm
Astronomical telescope optical system: refraction
Lens Diameter: 154mm, Focal Length 2250mm
Effective diameter: 150mm
Attention: 2pcs lens makes a objective lens group.
Package includes: 2pcs lens per , lens group.
this Group contains the Lens holder
,
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ective lens
D=154mm F=2250mm multilayer blue film
diameter
154mm
focal length
2250mm
Coating
multilayer film 400-700nm
Combined image quality
1/4-1/8
Diameter tolerance
+0/-0.12 mm
Center thickness tolerance
±0.2mm
Focal length tolerance
±0.1%
Finish
60/40
eccentric
1'
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