http://www.intane-optics.com/products/product-apo-80mm-f-7-80mmed.html
看看英田自己的介绍吧:
Specifications:
Aperture 80mm
Focal Length 560mm
Material Two ED glasses and one Flint Structure Cemented Triplet
Color Correction APO
Surface Quality (not worse) 60-40 scratch & dig
Surface Accuracy (not worse) λ/4 P-V at 632.8nm
Coating All surfaces are coated with multilayer Broadband AR coating