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Thisaffordablehigh-performancezoomlensisnotonlycompactandlightweight,butithasbeenspecificallydesignedtobringoutthebestinthea7-seriesfull-frameE-mountbodiesaswell.Thezoomrangeextendsfrom28mmthrough70mm,providingeasyaccesstothemostfrequentlyusedanglesofview,andthankstoanadvancedopticaldesignthechangeinoveralllenslengthduringzoomingisminimal
Thisaffordablemid-rangezoomlensfor35mmfullframeformatcamerascombineshighopticalperformancewithcompact,lightweightconvenience.TheFE28-70mmisidealforawiderangeofsubjects,andisdustandmoistureresistantforconsistentreliability.OpticalSteadyShotimagestabilizationincluded.
Whenchangingyouraperturetodefocusthebackground,thelightsourcesappearblurred.This‘bokeh’effectoftheblurredbackgroundcanbeenhancedwithcircularaperturebladesusedinthislens.Conventionalaperturebladeshaveflatsidescreatingunappealingpolygonalshapeddefocussedpointsoflight.αlensesovercomethisproblemthroughauniquedesignthatkeepstheaperturealmostperfectlycircularfromitswide-opensettingtowhenitisclosedby2stops.Smoother,morenaturaldefocusingcanbeobtainedasaresult.
Asfocallengthsgetlonger,lensesbuiltwithconventionalopticalglasshavedifficultieswithchromaticaberration,andasaresultimagessufferfromlowercontrast,lowercolorquality,andlowerresolution.EDglassdramaticallyreduceschromaticaberrationattelephotoranges,andprovidessuperiorcontrastacrosstheentireimage,evenatlargeaperturesettings.SuperEDglassprovidesenhancedcompensationforchromaticaberration.
Asphericallensdesigndramaticallyreducessphericalaberrationwhilealsoreducinglenssizeandweight.Sphericalaberrationisaslightmisalignmentofthelightraysprojectedontheimageplane.Thisiscausedbydifferencesinrefractionatdifferentpointsonconventionalsphericallenseswhichdegradeimagequalityinlarge-aperturelenses.Speciallyshaped“aspherical”elementsnearthediaphragmrestorealignmentoflightraysattheimageplane,maintaininghighsharpnessandcontrastevenatmaximumapertureandcanalsobeusedatotherpointsintheopticalpathtoreducedistortion.Well-designedasphericalelementscanreducethetotalnumberofelementsrequiredinthelens,thusreducingoverallsizeandweight.AdvancedAspherical(AA)elementsareanevolvedvariant,featuringanextremelyhighthicknessratiobetweenthecenterandperiphery.AAelementsareexceedinglydifficulttoproduce,relyingonthemostadvancedmoldingtechnologytoconsistentlyandpreciselyachievetherequiredshapeandsurfaceaccuracy,resultinginsignificantlyimprovedimageaccuracyandquality.
Gyrosensorsbuiltintothelensdetecteventheslightestmovement,andthestabilizationlensispreciselyshiftedtocounteractanyimageblurthatmightoccur.Theuseofprecision,quietlinearmotorsandtechnologyinheritedfromhigh-endSonyprofessionalcamcordersresultsinexceptionallyquiet,effectiveimagestabilizationthatcontributestohigh-qualitymoviesaswellasstills.
Onlythemiddlegroupsoftheopticalsystemmovetoachievefocus,sotheoveralllengthofthelensdoesnotchange.Otherimportantbenefitsincludefastautofocusingandashortminimumfocusingdistance.Also,thefilterthreadatthefrontofthelensdoesnotrotate,whichisconvenientifyou’reusingapolarizingfilter.
