Inphotography,alenshoodorlensshadeisadeviceusedontheendofalenstoblockthesunorotherlightsourceinordertopreventglareandlensflare.Thegeometryofthelenshoodcanvaryfromaplaincylindricalorconicalsection(muchlikealampshade)toamorecomplexshape,sometimescalledapetal,tulip,orflowerhood.Thesemorecomplexshapesoflenshoodtakeintoaccountthefinalimage'sshapeandaspectratio.[3]Thisallowsthelenshoodtoblockstraylightwiththehigherporti***ofthelenshood,whileallowingmorelightintothecornersoftheimagethroughtheloweredporti***ofthehood,therebyreducingtheamountofvignettinginthefinalimage.Ideally,lenshoodsshouldincreaseinlength,andthereforeinefficiency,asthefocallengthofthelensincreasesandtheangleofviewreduces.Lenshoodsaremoreprominentinlongfocuslensesbecausetheyh***ea***allerviewinganglethanthatofwide-anglelenses.Forwideanglelenses,thelengthofthehood(awayfromtheendofthelens)cannotbeaslongasthosefortelephotolenses,asalongerhoodwouldenterthewiderfieldofviewofthelens.VYOpticscouldmanufacturevariedsizeoflenshoodorlensshade,pictureshownis37mm.OEMis***ailable,too.AlllenshoodsarefitforCanon,Nikon,Olympus,JVC,Kadak,Fuji,Casioandsoon.)