产品详细描述：Inrecentyears,demandforHDproductionhassteadilyexpandedtoencompassabroadvarietyofprogramgenres.Undersuchcircumstances,theHJ17ex7.6BhasseenaworldwideriseinpopularityasastandardHDlensh***inghighperformanceandeaseofoperation.TheHJ17ex7.6Bisalenswhosecentraldesigncriteriawerelowweightand***allphysicalsizetosupportgreatermobilityespeciallyforHDnewsgathering.ItalsoprovidesashortMODofonly0.56minresp***etoastrongmarketrequest.WithitshighopticalimagingqualitiestheHJ17ex7.6BisdistinguishedwithintheHDxslensseriesbyahighpriceperformanceratiothatfacilitatesmanyformsofHDprogramorigination.Anewlydevelopeddigitaldrive-unitfurtherstreamlinesthelensergonomicsandeaseofoperationthatempowerscameraoperatorshootingflexibility.(Newdriveisloadedwiththelensthathas‘A'attheendofitsmodelnamesuchas‘IRSEA',‘IASEA'.)MainFeaturesRealizationofMiniaturizationandWeightReductionThenewdesignachievedareductioninsizethatproducedatotallengthof206.4mmwhilealsoreducingtheweightofthelensto1.60kg(IRSEAtype)whichiscrucialtomoremobileshooting.Attentiontothelensfrontenddesignintheformofanopticalportdiameterofonly82mmandahoodreducedinsizesoastonotoccludethecameraoperatorsviewingofthescenewhileshooting,furthercontributetothedynamicshootingcapabilitiesofthelens.ShortMinimumObjectDistanceof0.56mByreducingtheminimumobjectdistanceto0.56mthelenscanbebetterutilizedwithinconfinedspacesallowingobjectstobeeffectivelyimagedatshortdistanceswhileoperatingwithawideangleofviewfacilitatedbytheminimum7.6mmfocallength.Designimprovementsh***eloweredopticalaberrati***atthewiderangleandopenaperturesettings.HighopticalperformanceAccumulateddesignexperiencesalliedwithadvancesinopticaltechnologiesandmanufacturingtechniquesh***econtributedtoahigherlevelofoverallimagingperformanceintheHJ17ex7.6Blens.Inadditiontoprovidingawiderfieldofviewsomechromaticandmonochromaticaberrati***h***ebeenreduced.Specificallytheseincludealoweringoflongitudinalchromaticaberrationatthelongerfocallengths,andcurtailmentofsphericalandcomaticaberrati***.Adoptionofnewopticalmaterialsalsoaffordedareductionincurvatureoffield.Thelensfocusingsystemhasalsobeenimprovedovertheconventional2-groupinnerfocusintermsofashorterMODandimprovedresolutionatthepictureextremitiesespeciallyoverthemiddletotelephotofocalrange.NewErgonomicDriveUnitBesidestheexceptionalopticalperformance,anotherremarkablecharacterofthisnewlensisit’snewlydesigneddriveunit.Withthegoalofpursuingeaseofoperation,Canonhasreachedanewdesignbasedonhumanergonomics,refinedbyalongtermresearchandtesting.Ofcourse,alltheadvantagesfromthecurrente-HDxsDigitalDriveUnitsuchas"InformationDisplayforusercustomizesetting","RotaryEncoderforvirtualstudiointegrationandprecisecontrol"and"EnhancedDigitalFuncti***"areinheritedtothenewdriveunit.SeemoreinformationfromourFAQLensHJ17ex7.6BIRSEA/IASEAZoomRatio17xBuilt-inExtender2.0xRangeofFocalLength(withExtender)7.6-130mm15.2-260mm(2.0x)MaximumRelativeAperture(withExtender)1:1.8at7.6-97.5mm1:2.4at130mm1:3.6at15.2-195mm(2.0x)1:4.8at260mm(2.0x)AngularFieldofView(withExtender)4:3AspectRatio(8.8x6.6mm)60.1°x46.9°at7.6mm3.9°x2.9°at130mm32.3°x24.5°at15.2mm(2.0x)1.9°x1.5°at260mm(2.0x)16:9AspectRatio(9.6x5.4mm)64.6°x39.1°at7.6mm4.2°x2.4°at130mm35.1°x20.1°at15.2mm(2.0x)2.1°x1.2°at260mm(2.0x)MinimumObjectDistance(M.O.D)0.56m(10mmwithMacro)ObjectDimensi***atM.O.D.(withExtender)4:3AspectRatio(8.8x6.6mm)59.9x44.9cmat7.6mm3.7x2.8cmat130mm30.0x22.5cmat15.2mm(2.0x)1.9x1.4cmat260mm(2.0x)16:9AspectRatio(9.6x5.4mm)65.4x36.8cmat7.6mm4.0x2.3cmat130mm32.7x18.4cmat15.2mm(2.0x)2.0x1.2cmat260mm(2.0x)MacroYesSize(WxHxL)159.3x106.6x206.4mmWeight(Approx.)IRSEA1.60Kg(3.53lbs)IASEA1.68Kg(3.71lbs)OperationalAccessoriesFullservo:SS-41-IASD/SS-41-DSemiservo:MS-210D)