WIXLIB

tII.-{Þr38:¡0.LT¡¡uu Ifoçr¡B@Edbsr.rPt¡Ðé ¡¡d uos focd PlucCeot¡ul nmof sülsccX dl¡EÉtdOutcr tonÊDir(ED)504t).404030m'I5IO5ó.specif,ed indefects for dig:s and bubbles3.6.3.1thru 3.5'4'1 inclusive'3.6.1 Surfo,ceqtnlity of cenented,fane'Ceshallinsiae the free aperbure*"î'ã.t*itcementtheth¿ton the basisil;;;ã;ãsurface of the specifiedsingleañ";;;;;when not specified'.the sur i;î;Glitv.shall be interface quality for a cement facefaces'¡"i*een that of adjacent*"ãlit"separation3.6.2 Ed'ge sepørølions' Edge.compoopticalinand edge cement defectschamedgeth-ebeyond.ñ.ff not extendorlens"ï"tcemented surface or t1'9;";';iih;l/z'thedisprism by a distance g¡èater t}raysurfac-e.chamferffiä ;J*een the ceiltttttaradius of the clear'of the component "na ttt"dimension of anyaperture. The maximumdefect shaìl notcdge separation or cementsurface of the comextend into the cemented.15.10l520of 3'?-2- andto meeting the requirements.voids or separal.g.l.6Z, ihere shall be noof the bondedtions that exceed 1ò percentare&,3.? OPtical comPonentaeiaits'g.7.1 Tentpeio'ture operàtion' CeT-"1':UÚ.4'¡ -t"corlrl'u'trr¡Lù as a result:f."*Po:l:"-:: plus,i:"oirporr."t,àr minuì 80o andbient air temperatur,, :--,, -rr it,î äö e. ìrrrlt not develop"f-eatherh*,'. * "7evidenceof separat'ionoi' sotteni5 :i ::-""X'tl- t;l'sPeciñeu;;'ä',i;ï";;;;ìx"ePt asincrease or dewith the provision ttrit tfrecementof edge separation or edge.;;i;;;;;irejection'à;;'.;t shall be causefore op3.7.2 R etøtit'e ht¿midity-temperøt'uras a re sultofcrotiott. Cemented "ompo"enttatmosphqre of plus:;Ë;;"-;- ""tn¡i""tantl.at least 9'çv¡"Y---¡ ' temperatu'e,iäõ;r'ùu rf]::::minimumsubsequentrelative h umidity' and- -- .r- nrofïTìi::iåïJi,F'''n:1ll:1,ì'i;;'¡¡ **::J'#lH;Jå:'::äandPlus160oïil:: äö*t,,,"ïl:'l: ji::äi"n* i,.ijr'fi o-*evidence"iiiï'-ãó'"r.':pij T:.: iedge seParatlonsat the surface cham. than 7/zmm", *""""dshall not exceed10fer of the lens o'-pti"*'percent of the Perimeter'(gtass -to ntetal)'3.6.3 Boæding d'ef ectsa conthalj.haye alongB;á"d optical ""t"*bli"tadhesivetinuous bead of ãã "otn"asurface'of the bondedi'tt""¿g"Subsequent3.6.3.1 V oi'd'sønd' separatiozs'exceptof cement or other defects'"ãit"ningas specifredin 3'6'3.7.3 Reflection r:ed'ucing fiItns'.'Optical"surfaces.;;iñed on drawings as.";i;;.abe coatedwith reflectionäË;;"-tirn*t'reducing film (see 3'2'5)When speÇiñed'3.7.4 Opticot blackenín'g'4xlx

MIL4-I3fËÌO.1,ground surfacesof optical elementsshall beblackened with a finish approved by the responsibletechnicalactivitY.3.7.5 Resoluúioz.Resolution tests shall beperformed on each objective' collective, erector, eyepiece,mirror, vredge,rvindorv,filter,prism and prism assembly(optical) as speciñed in 4.2.5.3.7.6 Ps.rdl¿lism, fi'Iters. Pa¡allelism ofñlters shall be within the tolerance specifiedon the drawings. When no tolerance is specified, filters located internally or in front ofa telescopeshall not exceed 1 minute of arclight deviation. Filters located between theeyeldns and the exit pupil shall have a lightdeviation not exceeding5 minutes of arc.Reticle scale3.7.7 Reticl¿ sco'Ie sprc,.cíng.spacing shall be tested in accordancewith4.2.10.5:3.7.8 Polished surføces. Polished surfacesshall show no evidenceof grayness or stainwhen inspected in accordancewith 4.2.2.3.7.9 Leæes.3.?.9.1 SurÍo¿e q1u.Iity. Surface quality ofeech lens shall be in ¿ccordancewith applic¿ble drawings .or instrument specifications.When not specified,the surface quality shallbe as follows: Objectives, erectors, windowsand other elements which lie at least fifteendiopters out of the focal plane, shall have asurface quality of 80-50 or better. Field andcollective lensesshail have a surface qualiþof 20-5 in the central zone and 40-15 in theouter zone.Center lensesof oculars shall havea sur{ace quality of 40-15 in the central zoneand 40-20 in the outer zone. Eyèlenses,excepting those in symmetrical eyepieces,shallhave a surface quality of 40-20 in the central'Whenthezone and 60-30 in the outer zone.field and eyelens are identical, the surfacequality for both shall be 20-5 in the centralzone and 40-15 in the outer zone. Fii¡erswhich lie betrveenthe eyelens and the exitpgpil shall have a surface quality of 40-20 inthe central zone and 60-30 in the outer zone.Filters which lie internally shall have thesame requirements as specified for prismsin 3.7.10.1.Filters located in front of the ob-jective shall have a surface quality of 80-50or betfer.3.7.9.2 Edge chips. Edge chips which donot encroach on the free aperture of the lensshall be allowable, providing the chip doesnot interfere with the sealing of the lens.inthe mount. The surface.of all chips lsrgerthan l/2mm, as meåsured at the largest extremities, shall be "stoned" to roughen it andIessen the possibility of annoying reflecfionsand additibnal chipping. The sum of thechip widths of chips largel than f/smm, asmeasured at the edgeof the lens, shall not exceed 10 percent of the perimeter. Fracturesin excess of t{2mm depth in any face or edgeshall be ground out.Ground out areas shallreinain within the applicable stoned chipIimits of this paragtaph. Fractu¡es in excessof these limits shall be ceuse for rejection.Stoned chips and fractures in ground faceswhosä total summed up areas are in excessof2 percent of the area of the ground face orwhich are in exóäss of 2mm depth shall because for rejection. Such.stoned .chips andfractures shall be cause fo¡ ¡ejection whenthey interfere with the optical psth otmounting or sealing methods rega¡dless oftheir size.3.?.9.3 Con*entricíúy. Edges of all elementsshatl be trued to diameter about the opticalaxis as a center by g¡inding. Iænses composed of two or more elements shall be cemented and centered in such a manner thatthe axis of each element coincides with theaxiÉ or axes of the othe¡ elementor elements.Ocular lenses shall'be concentric within 6minutes of arc, and all other lensesshall beconcentric within 3 minutes of arc unless'otherwise speciñedôn the drawing or in ôetail specifications. After centering and cèmenting, mechanic¿l eccentric glass overhang in excess of 50 percent diametertolerance shall be removed. Optical eccentricity is.definedas the angular deviation,afterrefraction of an incident ray which is coincident with the geometric axis of the lens.'3.?.10 Prisms and,mirrors.3.7.10.1 Surface qunlity. Surface quality ofeachprism shall be in acco¡dancewith appli-859Siondords

Mtr 13830,A'specifications'csble drswings or instrument15 diopter-sle¿siatlieFlt t*f".es whichbe 80-60 orshallqualitvtft. focal plane,6 to surfacetheiloi'å;; åi tt," focal plane40-15andzoneb" io tot thó centr¿l]iiiliewhichfor the outer zone. For surfacessurfaceplanervithin 6 diopters of the foca!ss fôr reticles'il"tttt shall b the same\¡/)rich dog.7.LO-2Edge chips' Edge ehips-"o.to"chon túe free ape::ture of the,,oiwithin the followingOtit- tfr"fl be allowablechip widths shalltheofsumTheii-it"tio*:length of edgetheofpercent¡rot exceed 10shall l)eChipsoccur'chipsthe""'*iì"ftfrom thã bevelled edge' noì from;*;;;;ãi-e. after bevelliag and not t''e höã;";shaìl not betoi. Ct ips less than þmmthanand not stoned; chips larger""t"t.Ai¿** ehall be stoned. Encroachment of chipson the faces of tue prismíliliñ;;trednominal lengthirãt" ii ¡"velled edges'If the"ore bev,elling)befsharfcoinerì ;ä;Jtowhich is adplismtheofedgeài tft" tit"ttestpolished face is an inch or le-cs';;;toif said"nvchips may encroach the faces 1mm;encroachmaychipsi""gtt'zî"t. *.eds 25'4mmtltathf.i. shall be permiïibt e .providedwithin-rerferewhichlf,"r" are no edge cùipsmetirãas oi sealing and the chipsåi""tì"gaperture'ão oot eicroach upon the freetheoptional su¡faces and shsll be treated in3'7'10'1's¿me maoner as specifiedin3.?.10'5.3 Ape'rture' surlaces' Apertureis.tÐsu¡'facesof prisrns through which tightparttclesl-,e tlaasmitted shall be free fromprocof silver or ¿luminum remaiuing fromessing'rf other surfaces'3.?.f1 Reticles-qual3.i.1l.i S'utface qun'Lity'The surfacedrawing:s'ity shail be as specilìed on the'Whenqualityuot so speciûed the surfacespeciliedfor focsl pianesin 3'6'6'3';ilil útfot zone sizes' The centrsl zone shallaperture'"-".pibe the central area, one half the freegraduaii v¡idth, f¿r reti-cleshaving reticlethoseandtion extrerrities within this area'linesvertical,-tìll.t having irorizont¿l andRetia¡ea'ìuiurru, gratluatic''¡s outside thecent¡allt*uiirg gracluatic¡nsoutside thethewidth'"tu,áråt, o.t" i,"U ttt. free aperture-inthreearea'shall be the central;.;;L-ï;"tcaperture in width' Imperfec'freethefourthsperLtvo"a the free aperture shall beli;"notdoÁìil"¿ providing their characteristicsimpair performance of the iustrumentchip limitatious3.?.11.2 Edge- cit'ips'rvith 3'7'9'2'"aS-ein uccordancerh;ii t o"v"luÁtudParal3.?.11.3 Parallelism of flnt zurfcces'withinbereticle flat surfaces shalll.fittìfdrawings'the tclerances specifred by theth'e drawing'Wfr"r. no tolerance is given ondeviaTheshall be 6 minutes of ¿rc devia3.?.10.3Drwwing requirent'et¡ts';;;l;i"t;"ceerrorortion of angle errors, pyramidal errortion of light .?.11-4 Ma¡kittgs' Reticle markingsspecifiedasbeshalltilt,].*lu[iorr, and imagêlnroogtt an eyepieceof essentiallv¡"îi.ï"¿¡eticle willon the drawings.the game pov¡er ttnder which theLettersprismsùe-vio*"¿-in the finished instrumen!'3.?.10.4 Erecting prßms' Erecting,orpar{nu¡nberin4'2'5'2'(rvhetherintrr¿ oo*"ralsinspectedãsspecified"h;ii;;to graduations) shall be inspectedãã¡."tor3.?.10.5 Reflecting surfores-si'l'ueredpti* tify foi legibility' Defects in.lumbersprovided eachaluminized.ãi r.ti"tt shalt úe acceptableSbenpartially sili"tt.l o. ngure is legible eshallshallprismsnumberscil type letters andvered surfaces of ocularwidth of theirregufromfreedomshowshall itiã.'1i"" breaks one half theandarp.tcontaina magline shall be permitted' For reticlesiarities when inspectedwith the aid oflines orper5ofbreak1eyepieceing *o. than rS lines,riifrer of at least the porver of thelinespertains'thereof shail Le permitted'.All;;;.ti""if,e instrument to luhith the prismandwidthuniformshall appear to be ofapshalllines3.?.10.5.2Defects. Defects on reflectingofti u intersections;õlion othe¡defectsassamethesppear"-oãsurfacesr ¡r.-Él ñltrfìllqBóO

ìrIMIL r38:lOÀSurface of collectivelensesin efocal plane( b ) i-ess criticsl surfeces,Surfac of ocuLerfreld lenr nearest the retide,Collective len¡, center len¡ orprism eurfacæ nesr a focalplane( c ) Least critical surfaces,Âll other surfaces of windowa,. objectives,Primu, erector,andeyeleruesvaria-'D ar to be sharp. Smooth or abruptshalllineentirethealongwidlhãi"* i" linelinethepercentof20ofiot ¡" in excesswithb shalllinesbowediiatn. In addition,casnin dimensional requirements snd in noofexcessin 'sh.all reticle lines be bowedtheatfiIletradiusthe reticle line width- Theof reticle lines shsll not exceediot"*."tio"forthe line width. Acid burns shall be c¿useviewedigrej"ctioo, if visible wheu reticlêwith approPriate eYePiece'3.?.11.5 IlJumínatedrethhs' If the brightness of a defect is greater than the brighto"s" of a reticle line whcn illuminated by theassociatedinstrument light or light of equalintensity, the defect shall be cause for rejection.3.7.12'Wed.ge ønd wind'ou. IVedge endwindow surface quality shall be in accordance with 3.?.9.1.3.8 Optical sYstems.3.8.1 t/zr¿sseÍLble¿I.Opticalsystems of specified design procured unassembled shaÌl bethesrouped into systems in accordance withãpücal diagram pertaining to the system, andsheil b inspected as specified in 4'2'9.3.8.2 AsseÍLbl¿d. Optical systems of specified design procured assembled in their rs'spective instruments shall be assembled inaccordance with the drawing and specification for the instrument, and shall be inspectedas specifiedin 42.10.3.8.2.1 Def ect críteria. Defects not otherwise covered in this specifrcation,which willnot impair the performance of the finishedinstrument, shali be permissible.'Whether aparticular defect shall be permitted will depend on the location of the element in the finished optical system' Defects in elements notnear a focal plane are not as important as inelemenls which lie in or near a focal plane.ln all inst¿nces primary emphasis shall bepiaced on the performance of the lerrs orprism rather than its appearanceunless thelatter definiteiy indicates poor workmanship.The order of importance is as follows:(a) Most critical surfaces,Etched surface of reticle3.8:2.2 Alin¿n'ent. The optical elements ofall optical systems procured aseembled intheir instruments shall be alin d so th'et theexit pupil viewed on the optical a: is Éh'allhave a minor diamet¿r not less fhnn 0 per-cent of its m ajor diameter. The exit pupilshall be concentric with the exit free aperturewithin 10 percent of the exit free aperturewhen viewed from a point on the optical axirat s distance of approxim"telY two feet fromthe eyeleus.'Whenrpecified, moir3¡8J.3 SeÃl¿diohts.ture preventive sealing compound (ee 32.4)shall be evenly applied to the opticsl component to form an unbroken bead. When injection sealing is utilized, 2l hours shall elapsebefore collimstion of the i¡strunent.3.8.2.4 Pold.íng. The use of pads, shims,wedges, or opening under or around opticalelements is prohibited and shgü b esu¡¿ forrejection of the instrument unless specifledby the drawings.3.8.2.5 P erf ormønce clwronterriatins-''3.8.2.5.1 Vibrøtion.,{fter being aubjectÆdto the vibratioh test specifiedin d2-10.7 theoptical instrument shsll show no dirt (dustoi lint) in excess of thet allowed by the de'tail specification. In the sbsenc of det¿ili{uirements, dirt in any confined space shallttot U. in size or amounts larger than the allowablê dig specificetion for the adjacentsurface requiring the best dig qualify. Theinstrument shall show no evidencæof looseordamaged parts subsequent to this test.3.82.5.2 Slnck. All complet¿d subass"mblies in which an optical elementis physicallyBó1StondordsiiI

MII, I383OAasupported f¡om a'nother part or parts bythetosubjectedbeshallbondgiiJ,t t" metalshock test.3.8.2.5.3Cl¿ønlines¡.r'he optical surface ofandcompleted instruments shatl be cleanfree of condensatesand volatile substancesexamined by method specified in'*tr.tbei.i.to.g. Dust retention grease shall nottheuséd except with specifrcauthorization ofresponsibletechnical activitY'3.8.2.5.4PoraJh.z. Parallax shall l;c t'emoved where sPccifredin 4'2'10'1'3.8.2.5.5Fhed eyepiecef octts'Unless otherwi'se specified the reticle at the center ofthe field itt"ll b" in sharp focus whcn the eyepiece is set between minus 0'7Í¡ and minusi.O diopter. A calibrated dioptometer rvith amagnidcation of at ieast 3 po\¡/er or an equivatent auxiliary telescope shall be ' used tomake this setting.3.9 Workmanship. Standards of work¡ranship shall be such that components *'ill meetall iequirements of this specificationand anyreferenced specificationsor drarviugs wheninspectedin accolcìancervith section4'the general specifrcationshall apply. Appropriate sam¡ìing proceduresmay be usedwithprior approv¿l of the responsibletechnical""i;Ï,ùitchoniu.I dùnensí.otts.Eachoptical coinponent shali be checkedfor compliance rr.'tbhthe meciralricaldimensionsqf theclr:r*'ing and sltall be inspectedin accordance.¡¡ith thã r,-'t¡ttiremrtntsand tests in thi's speciÍicatirin.t:e qttnlity. Each element shaìl4.2,? .{:¿,'i'nby the foìlowing methods forbe mpliance3.7.r 0.Ì.4.2.2.1 Ins¡tc':tícn netlt'od,No. J' The elèment to be il;¡recteo shall be vierved againstâ t{roì.it1,.i.¡la,il úr opaì surface illuminat'edfrurn i,eni:tii irl' a forty watt lamp approxirnatelr; lì illches from the glass' Two or moreopa{¡re irctrizotrtalbars occupying approxirnatåly lr2 thc area of the glass shall be placediti front of rrnd in contact with the glass'4.2.2.2 Ins:pcctionmetl¿odN,. P' The lightthrough grortnd glass fi'om a 40 watt bulbshall be passedthrough the element'Defectsare ctrservedl¡y light scatteredfrom the sul'face r','hile vielvinç¡ it at ap¡:r'oxirn':rtely90'4. QUÄLITY ÄSSURANCE T'ITOVISIONS. i.o the path of the ì.rea¡nagaiust a dark back4.1 Responsibitity for inspection' ise't.Z.'JT en.lt erøtu'rc test.chase order, the supplíer is t'esponsihleforthe performance of atl inspection require4.2.3.1Tl'n'ee out of the lirst i0 of s*"n[,type of centerttedor br¡ncìedhisutilizema¡'supplierthebe testetl atshallspecified,rviseptãt.C uudet e¿icl.cont:.'tctlabot'4tot'ycommercinloranyou'n facilitiesthe high nud lorv temperatutes .?.1. H there is l'easouto cloubtquality, litcofanypelfolmtotlteright*.nt ,.".vesto tes¿actditionalsâmplesasright is the insþectionsthe insl¡ecttlr deems lleces'sal'y'u'here such ins¡tectionsare cleemednecessat'J' subjectàd to thesetests shail have passeclallto assure supplies and selvices confot'm toother t'eqttiredtests.prescribed lequirements.4.2.3.2The cemented or bonded compo4.2 Test methods.nents shall be subjected bo an ambient temperature of minus 80o F. for 5 l"r-rurs'lVhenOpJ.Z.L Inspcctíon, oTttículco'ntponeæfs'inspecfeclvisually at this ttìmperature, andtical componentsshall be inspected by apagain after remaining frve hout's.¿t- roomproved optical metliods and equipment inthe optical assemblyshall showàccorrlancewith applicable detail specifica- temperature,or reticulationtions. In absenceof approved test methods rro evidence of "feathering"of the conrseparationnobethereshallandofand equipment, the following proceduresIMISCELI.ANEOUS862

t,FI':DfII-{Þr38:XtAponents. In performing this test the opticalessembliesshall not be subjected to any undue thermal shocks while being cooléd tominus 80o F., or while being warmed to roomtemperature.4.2.3,3 The cenrentedoptical assemblllshallthen be subjectedto the following test at thehigh temperature. One of the componentsshall b held rigidly in such a manner thatthe cement¿d interface shall be approximately in a vertical plane. A weight of suchmagnitude as to induce in the optical assembly a unit shear stress of 5 ouncesper squareinch of area of the cementedor bond'edsurface shall be suspendedfrom the other component. ln no case shall the weight be lessthan one ounce.For lensesthis area may bet¿ken ¿s the projected areâ, rr X whet'eD is the diameter of the lens in inches. Theentire apparatus shall be allowed to soak atan ambient tempet'ature of plus 160" F., or'slighily higher, for 2 hours. The lens'shallpass the requirementsspecifiedby 4.2.6 whentested at ¡oom temperature and the ¡nove. ment or slippage of one component with respect to the other shall not exceed.002 inch.In performing this test the optical assembliesshall not be subjected to any undue thermalshockswhile being raised to 160o F. or whilebeing c.:oledto room temperature. '1.2.3.4Failure of oneopticalassemblyshallbe causefor stopping shipmentspending aninvestigation of the çause. The contractot'shall institute an immediateinvestigatidn irrthe presence'ofa representativeof the con,tracting officer if the representativedesiresto be present to determinethe causeof failure. If the investigation disclosesa fault incementing ot' bonding, acceptanceof opticalassembliesincorporating this fault shall bestopped pending correction. The contractor'shall correct his cementing technique anCshall correct all faulty optical assembliespreand shipmentsviously produced.Acceptanccwill be resumedrvhenten corrsecutiveopticalassdmbliesof the type rejected have successfully passedthe temperaturetests.4.2.4 Tenperaturerelatiz-ehunirlity.4.2.4.1 Three out of the ñrst 10 of eachtypeof cemented or bonded components st thebeginning of each contract, or upon change inmethod of cemeting or change in type ce'ment, shall be tested at the temperaturehumidity conditions specifiedherein. If theleis reason to doubt quality, the right'is reserved to test additional samples as the inspector deemsnecessary.4.2.4.2 The cementedor bondedcomp

axial rays.proceeding to tþe obserrerfs eye' The dianeter of the bundle et the e¡re shell be t¿ken as 3.5mm, (0.13?8 inch) if the exit pupil is over 3.5mm. If the exit pupil is sm.sller than 3.5mm, t\at diameter 'of the bundle at the eye shall'be the ss'me 8s the exit pupil. 3.5.5.2 Beo't¡t &ze lcss thnnin tã'blg I. When