Enter the focal length of the eyepiece in millimeters. This is one of the data fields needed to define the field-of-view (FOV) symbol that matches the field-of-view (FOV) symbol of a telescope eyepiece.
eyepiece-ஓட focal length-ஐ millimeters-ல enter பண்ணுங்க. இது ஒரு telescope eyepiece-ஓட field-of-view-ஐ match பண்ற field-of-view (FOV) symbol-ஐ define பண்ண தேவையான data fields-ல ஒன்னு.