68° Series 24mm Waterproof Eyepiece Aperture_2. 100mm - 127mm 3 focal ratio and a

3 focal ratio and a 114mm (4

The National Geographic Telescope/Microscope Discovery Set is an ideal choice for young scientists looking to explore everything from the soil to the stars

Argon cools slower thereby buffering the effects of rapid temperature changes of the optics

making them ideal for both visual observing and astrophotography

Available in both black and white

68° Series 24mm Waterproof Eyepiece Aperture_2. 100mm - 127mm 3 focal ratio and aUsing 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