Provided is a zoom lens which is telecentric on a reduction side, including a plurality of lens units, in which the zoom lens satisfies the following conditions:\u03bddp>75fwfp<0. The method of manufacturing a toner includes a step of producing a polyester resin by a reaction of dicarboxylic acid and diol, and a step of producing a toner base particle having the polyester resin and a colorant. In some embodiments, separate ports are provided for the user data and the ECC data.