More from Amazon.com : http://www.amazon.com/gp/product/B000WYVG34?tag=purrfectcatdi-20 <br /> <br />Tele Vue 13mm Ethos 2 / 1.25 Eyepiece with 100 Degree Field of View. <br /> <br />Apparent Field of View - 100 degrees <br />Focal Length - 13mm <br />Effective Field Stop - 223mm <br />Eye Relief - 15mm accepts DIOPTRX eyesight astigmatism corrector <br />Barrel Size - 2125
