1.25" 3X Focal Extender Focal Length_2. 11mm - 20mm the waterproof eyepiece internal elements

the waterproof eyepiece internal elements will remain as pristine as the day they were assembled

With its 50mm aperture

Its simple yoke-style alt-azimuth mount

plus a durable hard case for convenient storage and travel

while the stable Twilight I alt-azimuth mount provides smooth

1.25" 3X Focal Extender Focal Length_2. 11mm - 20mm the waterproof eyepiece internal elementsA good Focal Extender adds some real versatility to your telescope accessory line up. First of all, it allows you to increase the magnification of any eyepiece with the same barrel size that you already own. In other words, 3 eyepieces offer 6 magnification choices with the addition of a focal extender. Secondly, most of the time, lower magnification eyepieces have better eye relief than higher power models. When using a focal extender to increase