Axis Q1659 - Choose Lens; About Network Redundancy; About Power Redundancy

AXISQ1659NetworkCamera
Solutionoverview
Chooselens
Thereismorethanonelensoptionforyourcamera.Whichlenstochoosedependsonthesurveillancerequirements.Thelenseshave
differentcapabilitieswhenitcomestolightsensitivityandeldofview.Seetheproduct’sdatasheetforlensalternatives.
Depthofeldandsensorsize
Thedepthofelddependsonthelensaperture,thesizeoftheimagesensorandthedistancetothescene.Thelowerthef-number
andlargerthesensor,theshallowerdepthofeld.Duetothelargesensor,thedepthofeldismoreshallowinthisparticular
productthanintraditionalsurveillancecameras.Depthofeldbecomesshallowerindarkconditions,duetothefactthattheiris
opensuptoprovideenoughlighttothesensor.
Findoutmoreataxis.com/learning/web-articles/lenses-for-network-video-cameras.
Focusandlightsensitivity
Thefocuspointisaffectedbytheaperture(f-stop)ofthelens.Thelowerthef-stopvalue,themorelightreachestheimagesensor.
Thesmallertheaperture,thedeeperdepthofeldwhichmayleadtoanunwantedabsolutefocuspoint.Duringlowlightconditions,
whentheapertureisaslargeaspossible,thedepthofelddecreasesandtheimagemaythereforeappearunfocused.
Examplesofaperturesfordifferentf-numbers.
Tocalculatethedistancebetweenthecameraandtheobjectofinterestinrelationtoscenedimensions,resolution,andfocallength,
usethelenscalculatortool,gotoaxis.com/tools/lens-calculator.
Lenslters
Youcanuseanylterforstandardopticstoprotectthelensfromdamagesortomodifytheimage.Thiscanbeusefulindifcultlight
conditions,toltercertainwavelengthsortoreducereections.
Aboutnetworkredundancy
Thesoftwarecontrolsthenetworkredundancyandrequiresthatbothnetworkconnectors(RJ45andSFP)areconnected.TheSFP
modulehashigherprioritythantheRJ45connector.IftheconnectionbetweentheSFPmoduleandtheswitchislosttheproduct
switchestotheRJ45connectortoestablishacontinuedconnection.
Aboutpowerredundancy
Thesoftwarecontrolsthepowerredundancy.If,forexample,theDCconnectionfails,thecameraautomaticallyswitchestoPoE.
Dependingonthesetup,thecameramayrestartforthechangetotakeeffect.
4