20-60x Kowa Eyepiece For 82SV Suitable for the following Kowa spotting scopes: TSN-601, TSN-602, TSN-603*, TSN-604*, TSN-661*, TSN-662*, TSN-663*, TSN-664*, TSN-663M, TSN-664M, TSN-82SV * No longer in product range. This eyepiece can also be used with some of Kowa's historic spotting scope models no longer in their product portfolio: TSN-1/2/3/4 TS-610/611 Exit Pupil Eye Relief FOV @ 1000M Magnification Real FOV Relative Brightness Twilight Factor 3.0-1.0mm (TSN 600) 3.3-1.1mm (TSN 660) 3.9-1.3mm (TSN-82SV) 16.5-16mm 33.2-17.5M (TSN 600/660) 31-17M (TSN 82SV) 20-60x (TSN 600/660) 20-63x (TSN 82SV) 1.9-1.0 degrees (TSN 600/660) 1.8-0.95 degrees (TSN 82SV) 9.0-1.0 (TSN 600) 10.9-1.2 (TSN 660) 6.8-1.7 (TSN 82SV) 34.6-60.0 (TSN 600) 36.3-62.9 (TSN 660) 41.5-71.9 (TSN 82SV)