Nikon AI-S Zoom-Nikkor 25-50mm f/4 User manual

Zoom-Nikkor
25-50mm
iA
Nikon
INSTRUCTIONMANUAL
GEBRAUCHSANWEISUNG
MODE D'EMPLOI
MANUAL DE INSTRUCCIONES
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English
Depth-of-fieldscale -
Deutch
Scharfentiefeskala
Francais
Echelle de profondeur dechamp-
Espanol
Escala de profundidad decamp—
-4M
-25H
-Page 8
- Page 25
-Seite 12
-Seite 25
-Page 16
-Page 25
Pagina 20
Pagina 25

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NOMENCLATURE
1FocalLength/ApertureIndex9 MeterCouplingShoe
2DistanceScale10Aperture-Direct-ReadoutScale
3DistanceScaleIndexLine11ApertureIndexingPostforNikon
4InfraredCompensationScaleSB-ESpeedlight
5FocusingRing12ApertureScale
6FocalLengthScale13MeterCouplingRidge
7ZoomingRing14ApertureRing
8EEServoCouplingPost
FOREWORD
This25-50mmf/4lensisa retro-focuszoomlensfeaturing11elementsin
10groups.Itoffersthebenefitsofa wide-angle25mmlenswithcontinuous
zoomingupto50mm.Itiswellconstructedanddesignedtocorrectallaber-
rations,especiallybarreldistortionwhichisa commonprobleminwide-angle
zoomlenses.Althougha zoomlens,itsopticalperformancewillchallengethat
offixedfocallengthlensesforsharpnessandimageclaritythroughoutits
entirefocalrange.Bothzoomingandfocusingareaccomplishedthroughtwo
independentrings—minimumfocusingdistanceis0.6m,MultilayerNikon
IntegratedCoatingonallair-exposedlenssurfaceshelpsreducereflection,
thusminimizingflareandghosttoinsuregreaterimagecontrastandcolor
rendition. Amongtheapplicationsbestsuitedforthislensarepressphotog-
raphyandgeneralsubjectshots.
MOUNTINGA
Positionthelensinthecamera'sbayonetmount,aligningtheapertureindexof
thelenswiththemountingindexofthecamera.Twistthelenscounterclockwise
untilitclicksintoplace.Toremove,depressthelensreleasebuttononthe
camerabodyandtwistthetensclockwise.
Whenmountingthelensonthecamerawitha metercouplinglever(Altype),
makesurethatthecamera'smetercouplingleveriscorrectlypositioned;when
mountingona camerawithoutthislever(non-AItype),"manual"maximum
apertureindexingisrequired.Inbothcases,refertothecamera'sinstruction
manual.
FOCUSINGB
Tofocus,rotatethefocusingringuntiltheimageintheviewfinderappears
sharpandcrisp.Onceyoursubjectisinfocus,youarethenreadytozoom.The
subjectwillremaininfocusthroughouttheentirezoomrange.Forpinpoint
focusing, usethemaximumfocallengthandthenreducethefocallengthforthe
desiredpicturecomposition.
Youcanprefocusthelensbyusingthedistancescalemarkingswhichare
engraved, bothinmetersandfeet,onthefocusing ring. Turnthefocusingring

untiltheblackdotisoppositethenumberwhichcorrespondswithyour esti-
matedormeasuredcamera-to-subjectdistance.
RecommendedFocusingScreens
VariousinterchangeablefocusingscreensareavailableforF2andF3Nikon
camerastosuitanytypeof(ensorpicture-takingsituation.Thosewhicharerec-
ommendedforusewiththisZoom-Nikkor25-50mmf/4lensarelistedbelow.
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•WhentheTeleconverterTC-200isattachedtothisiens,usethefollowing
table:
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TeleconvertersTC-14andTC-300can'tbeusedwiththislens.
©= Excellentfocusing
<§)= Acceptablefocusing
Thesplit-imagerangefinder,microprismorcross-hairareaisdim.Focus
onthesurroundingmattearea.
O= Acceptablefocusing
Slightvignetting(ormoire phenomenon in the caseofthemicroprism)
affectsthescreenimage.Theimageonthe film, however,showsnotrace
ofthis.
Blankmeansnotusable.
WithPhotomic-seriesfinders,-Vjinthetableabovemeansthatthefilmspeed
(ASA/ISO)shouldbesetagainstthepropercompensatingmarkasshown
inthediagram.Whennoexposurecorrectionisindicated,thefilmspeed
(ASA/ISO)inuseshouldbeoppositethe• index.

ZOOMINGC
Tozoominorout,simplyturnthezoomringuntilthedesiredcompositionis
tramedonthefocusing screen.Theringhasafour-positionscaleshowingwhich
offivefocatlengths—25mm,28mm,35mm,40mmand50mm—isinuseincase
youwanttopresetthelenstoanyofthesefocallengths.
Caution: Slightvignettingwilloccurwhenyoushootwiththelensata small
aperture,atitsclosestfocusingdistanceandatawideanglefocallength.
DEPTH-OF-FIELDSCALE
UnlikeotherNikkorlenses,theZoom-Nikkor25-50mmf/4hasnocolor-coded
depth-of-fieldindicatorsengravedonthelensbarrel.However,youcanstill
determinethedepthoffieldbyusingthescalesprovidedwiththispamphlet.
Touse,firstcutoutthescalesalongthelinesindicated.Then,placethesub-
ject-distancescale(B)overthedepth-of-fieldscale(A)withthetopedgeofihe
(B)scalelinedupwiththefocallengthinuseandthefocuseddistancealigned
withthe(A)scale'scentralindicatorline.Nowreadoffthenumbers(ontheB
scale)whichappearoppositethepairofdepth-of-fieldlines(ontheA scale)
correspondingtotheapertureinuse;thesenumbersexpressthedepthof
fieldlorthesettingsinuse.
Forexample,ifthelensisprefocusedat1.5m(5ft)withthefocallengthsetat
35mmandtheapertureatf/16,thenumbersonthedistancescaleopposite
thedepth-of-fieldlinesforthef/16settingshowthatthedepthoffieldextends
from1m (3.511) to3m(10It).Youcanalsoobservethedepth o1 lieldthroughthe
viewfinderbypressingthedepth-of-fieldpreviewbuttononthecamera.
INFRAREDPHOTOGRAPHYD
Theplaneofsharpestfocusforinfraredlightisslightlymoredistantthan
itscounterpartforvisiblelightasseenthroughthecameraviewfinder.Thus,
forthesharpestfocusininfraredphotography,adjustmentsmustbemade.
Thescalesprovidedcanbeusedfordeterminingtheamountofadjustmentvia
thedottedinfraredcompensationlineincluded.
Inthesamemannerasdescribedinthe"depth-of-fieldscale"section,match
theprefocusedsubjectdistance(usingtheB scale)withthefocallengthand
aperturescalecentralindicatorline(ontheA scale).Thedistancefromthe
centralindicatorlinetothedottedcompensationlinerepresentstheamountof
adjustmentrequired.Now,turnthelens'focusingringcounterclockwise
untiltheprefocuseddistanceisshiftedasprescribedonthescales.
10