Front optic has a mark, in testing there was no visible effect on performance, optics clear of fungus and haze, snappy aperture, 30 day warranty from seller for peace of mind Works with: D1-D3-D50-D70-D70s-D80-D90-D100-D200-D300-D500-D700-D750-D800-D810-D3-D7000-D7100-D7200- D40-D40x-D60-D3000-D3100-D3200-D3300-D3400-D3500-D3600-D5000-D5100-D5200-D5300-D5500-D5600.
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