Explore Scientific 68 degrees 34mm Waterproof Eyepiece Essentials The whole series is parfocal

The whole series is parfocal

considering the small field of view and sometimes less-than-ideal illumination

Please note: this is the OEM version of the Orion Astrophography Flip Mirror - that is

Before the popularization of John Dobson’s altazimuth mount design with low center of gravity combined with a Newtonian optical assembly

• Lock screw for eyepiece/adapter

Explore Scientific 68 degrees 34mm Waterproof Eyepiece Essentials The whole series is parfocalUsing advanced computer design, combinations of low dispersion and high refractive index optical glasses, and durable multilayer deposition coatings, Explore Scientific 68 Series Argon Purged Waterproof extreme wide field eyepieces are optimized to produce high contrast, high resolution, and superior flat field characteristics. The visual effect of these eyepieces with their long eye relief and their 68 apparent field is truly a full immersion