The 1.25-inch barrel is the most common eyepiece size in amateur astronomy, fitting the vast majority of refractors, reflectors, Dobsonians and Maksutov-Cassegrain telescopes as well as standard star diagonals. Explore Scientific's 1.25-inch telescope eyepieces combine compact size and light weight with multi-element optical designs, making them easy to use on small and mid-size telescopes without upsetting balance.
Many of our 1.25-inch eyepieces are waterproof and gas-purged to help prevent internal fogging and dust, so they perform reliably on dewy nights and in changing temperatures. Shorter focal lengths in this size deliver higher magnification for crisp views of the Moon's craters, the rings of Saturn and the cloud bands of Jupiter, while longer focal lengths provide wider, more relaxed views of star clusters and nebulae. Whether you are upgrading the eyepieces that came with your first telescope or building out a complete eyepiece set, 1.25-inch eyepieces are a versatile foundation for any observing kit.
When building a set of 1.25-inch eyepieces, many observers choose three or four focal lengths: a low-power eyepiece around 24mm to 32mm for finding objects, a medium-power eyepiece around 14mm to 20mm for clusters and galaxies, and a high-power eyepiece around 5mm to 9mm for the Moon, planets and double stars. Pairing them with a focal extender or Barlow lens effectively doubles your options. Explore Scientific offers 1.25-inch eyepieces across our 52°, 62°, 68°, 72° ED and 82° Series, so you can choose the apparent field of view and budget that fit your telescope and observing style.
