In­ter­change­able lenses come in a huge ar­ray of types for shoot­ing dif­fer­ent kinds of sub­jects

Amateur Photographer - - Buying Guide -

IN GEN­ERAL, the eas­i­est way to ex­pand the kinds of pic­tures you can take is by buy­ing dif­fer­ent types of lenses. For ex­am­ple, tele­photo lenses let you zoom in on dis­tant sub­jects, while macro lenses en­able close-ups of small ob­jects. Largeaper­ture lenses al­low you to iso­late sub­jects against blurred back­grounds, or shoot in low light with­out hav­ing to raise the ISO too high. Mean­while, all-in- one su­per­zooms cover a wide range of sub­jects, but usu­ally with rather lower op­ti­cal qual­ity.

Lens mounts Each man­u­fac­turer has its own lens mount and most aren’t com­pat­i­ble with one an­other. For ex­am­ple, a Canon DSLR can’t use Nikon lenses, although you can use in­de­pen­dent brands if you get them with the right mount. Built-in fo­cus mo­tor Most lenses now in­cor­po­rate an in­ter­nal mo­tor to drive the aut­o­fo­cus, although some are still driven from the cam­era body. DSLR lenses of­ten use ul­tra­son­ic­type mo­tors for fast fo­cus­ing, while those for mir­ror­less cam­eras tend to em­ploy video-friendly step­per mo­tors. Fil­ter thread A thread at the front of the cam­era will have a di­am­e­ter, in mm, which will al­low you to at­tach a va­ri­ety of filters or adapters to the lens.

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