SV135 eyepiece is a good assistant for you to observe and take pictures of the planets. More comfortable to view the moon, Jupiter and Saturn. 36°-52° field of view. This is a zoom eyepiece considering that it zooms from 7mm to 21mm. which allows you to see different wide field of view under the same viewing conditions. Meet your different needs. Provide comfortable observation experience. 13-14mm wide eye relief can also provide an easy and pleasant viewing experience. It is also friendly to people wearing glasses. SV165 Mini Guide Scope Support sensitive auto guiding cameras for easy guide star acquisition. 45mm Tube Travel. Improved image adjustment accuracy. For clearer images when used with astronomy cameras and telescope eyepieces. Sturdy metal base. Fits most telescope finder-shoe bases. Does not take up weight, easily fixed. Brass pressure ring. Effectively protect the eyepiece from scratches. Adjust the set screw to firmly fix the eyepiece, and will not easily slip out of the interface. Nylon-tipped thumbscrews. Prevent the outer surface of guide scope being scratched. 30mm object lens, and back focus distance can stretch up to 45mm. Please pay attention to stretch to the end. SV165 Guide Scope can be directly connected to a tripod with UNC 1/4-20, so you can directly use it as a small telescope.