标准变焦距镜头一直是许多影友的“常规武器”,更有不少同仁钟情于此类镜头中的F2.8恒定大光圈一族。去年中旬,日本专业制造镜头3大主力之一的腾龙公司,一举推出了几款新型专业变焦距镜头,在业内掀起了一层不小的涟漪。其中,那款SP28～75mm F2.8标准变焦距镜头的问世,又让 Standard zoom lens has always been a lot of shadow Friends of the “conventional weapons”, many of my colleagues love more of this type of F2.8 constant large aperture family. In the middle of last year, Tamron, one of Japan’s three major manufacturers of lenses, launched several new professional zoom lenses, setting off a layer of ripples in the industry. Among them, that SP28 ~ 75mm F2.8 standard zoom lens advent, let