AchromaticLensisanachromaticc***istsofapositivelow-indexCrownGlasslenselementcementedtoanegativehigh-indexFlintGlasslenselement.Theelementsarechosensoastocancelchromaticaberrationattwowell-separatedw***elengths,usuallyintheblueandredregionofthespectrum.Focallengthisc***tantatthosetwow***elengthsandfocallengthshiftsarevirtuallyeliminatedacrossthevisiblew***elengths.Onefrequentuseistoachievediffractionlimitedfocusingofalaserbeam.NegativeAchromatsaretypicallyusedwhenthereisaneedtoeliminatechromaticaberration.Inadditiontoreducingchromaticaberrationatthedesignw***elengths,sphericalaberrationandcomaaregreatlyreduced.Supplyallkindsofachromaticlensasperyourrequested.Specificationofourachromaticlensasfollow:*Material:BK7andZF2(oraccordingtoyourrequest)*Dia.:+0/-0.05*Centerthicknesstolerance:+/-0.1*Surfacequality:60-40Scrath/Dig*Surfacefigure:0.5-0.2*Centration<3arcmin*Chamfer:0.1-0.25*45degrees*Designw***elength:486.1mm,587.6mm,656.3mm(theparameterisdemisionofnomallens,sospecificationwillbechangedaccordingtodifferentdemisionandmaterial))