More on Amazon.com : http://www.amazon.com/gp/product/B00HQOUCJ2?tag=thefatkidin06-20 <br /> <br />Explore Scientific 2 82 Series Argon-Purged Waterproof Eyepiece - 30mm (EPWP8230-01) <br /> <br />Focal Length 30mm <br />Barrel Size 2 508mm <br />Apparent Field of View 82deg <br />Eye Relief Designed 21mm <br />Filter Threads Standard 2 Filter Thread M48 x 075
