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With a 1900mm focal length and an f/15 focal ratio
Full RS-232 modem control signals
especially with inexpensive but powerful Newtonian telescopes
in a comfortable to hold roof prism design
1.25" 5X Focal Extender Series_100° With a 1900mm focal lengthA 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
US$ 12.99
US$ 14.99
