Canon 25 mm f:3.5 User manual

Canon Lenses
TheCANONLENShasbeenacclaimedbymanyexpertsasthe
finestlensinitsclasstoday.
Itisa precisioninstrumentascarefullyconstructedastheCANON
CAMERAitself.Treatit withrespect.It hasbeenaccuratelyset
andalignedbyhandandfinalsettingsarc madewithmicroscopic
alignmentinstruments.ALLCANONLENSESarerigidlychecked
forresolvingpowersandlensaberrationspherical,coma,astigmatic,
curvatureoffield,distortion,chromaticandcolordefinition.Any
lensthatdoesnotcomeuptoCanon'sveryhighstandardsinany
oneofthesetestsisimmediatelydiscarded.Accordingtothecharac-
teristicsofthelenses,theyarecoatedeitherinpurple,magenta,or
amberinordertoobtaintruecolorforcolorphotography.
Donotendeavourtoopenupthelens.Ifthereisanythingwrong,
returnthelenstoyourdealerwhowillforwardittothemanu-
facturersfortheirattention.
Note: AllCanon-ManufacturedLenses(excepttelephotolenses:
200.400,600,800and1000whichcomeswithreflexmirror
housing)arecoupledwiththeCanonCameraRangefinder
Mechanism
CONTENTS
HOWTOUSECANONLENS
Howtodismountandmount
lens4
Infraredmark5
Descriptions6
How to take core of your lens 7
Different Lens Effects
1.ChangesinRange8~9
2.Perspective10~11
ViewfinderandParallaxAdjustment
12
CANONLENS
25mmf:3.5.........................13
28mmf:3.5.........................14
28mmf:2.8.........................15
35mmf:2.8.........................16
35mmf:1.8.........................17
35mmf:1.5.........................18
50mmf:2.8.........................19
50mmf:1.8.........................20
50mmf:1.2.........................21
85mmf:1.9.........................22
85mmf:1.5.........................23
100 mmf:3.5.........................24
135mmf:3.5.........................25
200mmf:3.5.........................26
DEPTHOFFIELD
DepthofPhotographicField27
25mm.........................28~29
28 mm.........................30~31
35mm.........................32~33
50mm.........................34~35
85mm.........................36~37
100mm.........................38~39
135mm.........................40~41
200mm.........................42~43

HOWTODISMOUNTANDMOUNTLENS
TODISMOUNTLENS
Unscrewthelens,whichmaybeineitherextendedor
retractedposition,bygraspingitsb;tsc.Firstloosenthe
lensbya slightjerkingmotion,thenunscrewgently.
Donotoilthethreadofthelensortamperwiththe
lensinanyway.Alwayskeepthelensflangeshaded.
TOMOUNTLENS
Holdingthelensbyitsbase,findthethreadofthe
screwbyturningthe[ensslightlyina counter-clockwise
direction,thenscrewclockwiseintotheflangeuntillight.
DONOTATTEMPTTOTIGHTENTHELENSINTO
THEFLANGEBYGRASPINGANYOTHERPART
BUTTHEBASE.
INFRAREDMARK
InfraredMarkisusedonlyforinfraredphotography.Afterfocusingintheusualmanner,read
theobjectdistancescaleofthetens,andthenturnthelenssothattheobjectdistanceisexactly
oppositethe"R"indexmark.Thelensisnowfocusedforinfraredphotography.
InfraredmarkonanyCanonlensissituated
ina positionwhereitwillofferthebestre-
sultbyusinginfraredfilmandinfrared
filter(suchasKodakIR135andWratten
FilterNo.87).bothhavinga maximum
sensitivityata wavelengthofapproximately
8000A.Therefore,itisappropriatetoshift
about1/3oftheamountto"R"when
using,say,KodakPlusX orregular-
panchromaticfilmwitha Wrattenfilteror
aboutNo.25.

DESCRIPTIONSHowtotakecareofyourlens
1.Lensesshouldnotbechangedindirectsunlight.Turnyourbacktothesunandholdthe
cameraintheshadowofyourbody.
2.Alwayskeepthemountingflangeofyourcamerafreefromdustordirt.Afterdis-
mounting,yourlensshouldbecoveredwiththedustcapinstantlytoprotectthehelicoid,
whichisthemostimportantpartofthelens.
1.Nevertouchthelenswithyourfinger.Incaseitbecomesnecessarytoremovedust
fromthesurface,usea fine,softbrushorreliablelenstissue.Iffurthercleaningis
necessaryforremovingfingermarks,etc.wraplenscleaningtissueorlint-freecottoncloth
ontipofa stickandmoistalcohol(mixedwithetherwhenpossible)andwipethe
surfaceina gentlecircularmotionfromcentertoperimeter.Neverwipewithexcessive
pressureoryoumightscratchthesurface.
4.Donotstoreyourlensinhotandorhumidplaces.Thebestwaytostoreyourlensisto
keepitinanair-tightcontainerordesiccatorwithmoistureabsorbentsuchassilicagel.
5.Neversubjectthelenstoa sudden,extremechangeintemperatureorlenscracksmayresult,
6.Donotattempttoscrew-inorunscrewthelensbygraspinganyotherpart(especially
knurledfocusingring)butthebase.

DIFFERENTLENS
EFFECTS
1.CHANGESINRANGE
Showingthedifferences
incamerarangewhen
picturesarelakenFrom
thesamepositionbut
usingdifferentfocal
lengthlenses.
Indifferentlenses,thereisa varianceinthedegreeofclarityandalsointheirfocallengths.Thereis,
however,a muchmoreimportantreasonforinterchanginglenses:thatis.totakeadvantageofthe
differenceintheirrangesaccordingtotheirrespectivefocallengths.LetUSexaminethismoreclosely.
Alloftheabovephotoshavebeentakenfromthesamepositionbutusinglensesofdifferentfocal
lengths.TheshorterthefocallengthofChelens,thewidertheareacoveredbythepicture,but
theobjectsinthosepicturesallappearsmall.Thelongerthefocallength,thenarrowerthefield
coveredbytheresultingpicture,butinthesecasestheimageitselfappearsbigger.Theuseoflenses
ofdifferentfocallengthsthenbecomesa necessity.Torinstance,whenwetakephotosofa group
ofpeopleina smallroomagainsta blankwallbackgroundorwhentakinga pictureofa largebuilding
whenitisnotpossibletomovebackthenecessarydistance,theuseofa lensofsmallfocallength
isofadvantage.Ontheotherhandwhenpickingouta subjectfroma largearea,anditisnot
possibletogetcloser,theuseofa longfocusortelescopiclensisa beneficialadaption.

DIFFERENTLENSEFFECT
2.PERSPECTIVE
Considerationofper-
spectivewhentaking
photosfromvarious
distancesandkeeping
theforegroundthesame
size.
Theabovephotographsshowthedifferenteffectsobtainedbyusingvariousfocallengthlenses.Using
thesameforegroundsubject,variationsinthesizeanddepthofthesurroundingobjectsarcproduced.
Lookingattheseyoucanseethatwiththesamesubject,thereisa differentbackgroundeffectineach
case.Theshorterthefocuslengthofthelens,greateristheexaggerationintheappearanceofthe
foregroundinrelationtothesurroundingarea.Againtherearemarkeddifferencesinthedegreeof
thebackground.Withthelongdistancelens,thebackgroundareaisstrongerandclearlyadjustedin
relationtotheforegroundgivinganeffectofsolidnesstothepicture.Again,accordingtothe
sizeofthelensopening,therearedifferencesinthedepthoftheobjectbeingphotographed.This
hasadvantages,forinstance,inproducingdifferenteffectswithbackgroundfocus,orinusinga
maximumopeninglenstofacilitatetakingpicturesunderunfavorableconditions.Byselectingthe
appropriatelensandbytakingadvantageofitscharacteristics,youcanimprovetheexcellence
ofyourpicture.

VIEWFINDERvsPARALLAXADJUSTMENT
Asthebuilt-inviewfinderofthecamerahasnodeviceforparallaxadjustment,a separateview-
finderisrecommendedforalllensesexceptthosewithnormalfocallength(50mmand35mmfor
CanonCameraModelVTand50mmforalltheotherCanonCameras).A varietyofviewfinders
areavailableforCanonLenses.Amongthem are:
(1)ForusewithCanonCameraModelVTandlatermodels:ZOOMFINDERS"S"and
"L"SPECIALVIEWFINDERSV,LUMI-FIELDVIEWFINDERS.Whenusedon
theCamerathesefindersaremechanicallycoupledtothebuilt-inrangefinderofthe
cameraandparallaxisautomaticallycompensatedasthelensisfocused.
(2)ForCanonCameraModelIV-S2.II-SandallothercameraspriortoModelVT.use
SPECIALVIEWFINDERV,withFINDERCOUPLER,whichhasparallaxcompensating
adjustment.SincecameraspriortomodelVTarc notmechanicallycoupledtothe
viewfindersforparallax,youhavetoadjusttheparallaxmanuallybyadjustingthe
parallaxcompensatingscaleoftheFINDERCOUPLERtomatchthereadingon
theDISTANCESCALEofthelens.Bydoingso,thefieldyouseethroughthe
finderwillbeidenticalwithwhatthelenswillregisteronfilm.
Note:EventhoseviewfinderswhicharenotdesignedforModelVT,CanoncanbeusedontheModel
VTearnersprovidedthatparallaxcompensationismademanually.
LENSELEMENTS:5
LENSMOUNT& HEAD:NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f : 22
DISTANCESCALES:3.5~ 50ft,or1 ~ 20m,inf
ANGLEOFVIEW:82°
MAGNIFICATION:0.5x:
COATING:PURPLE
NETWEIGHT:142gramsor5 oz.
ULTRA-WIDE-ANGLE
CANONLENS
Aradicallynewlensgivingtheunrivalled,
full,sharpangle-of-viewof82. Anex-
tremelyusefullensforindoorphotog-
raphyorlandscapeshots.Incorporates
newSpectra-coated(TM)rareglassele-
mentspermittingthefastestspeedever
possibleinthisfocallength,without
sacrificeofdefinitionorcrispedge-to-
edgequality,evenatfullopening.

WIDE-ANGLE
CANONLENS
LENSELEMENTS:6
LENSMOUNT& HEAD:NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f:22
DISTANCESCALES:3.5~ 50ft,or1 ~ 20m,inf
ANGLEOFVIEW:75°
MAGNIFICATION:0.56x
COATING:PURPLE
NETWEIGHT:120gramsor5.1oz.
Auniquelensofexceptionallywide
angleofviewandspeed.Com-
pletelyaccurateanduniformin
lighttransmission.
WIDE-ANGLE
CANONLENS
LENSELEMENTS:6
LENSMOUNT&HEAD: NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f : 22
DISTANCESCALES:3.5~ 50ftor1 ~ 20m,inf
ANGLEOFVIEW:75°
MAGNIFICATION:0.56x
COATING:MAGENTA
NETWEIGHT:159gramsor5.6oz.
Embodiesnewrareglasselements,
makingpossiblethefastestaperture
designinthiswideanglefield.No
barreddistortionorcurvatureatall
lensopening-covers75°field.
Superbaberration-freeandcoma-
freedesign.

NORMALWIDE-ANGLE
CANONLENS
LENSELEMENTS:6
LENSMOUNT& HEAD:NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f : 22
DISTANCESCALES:3.5~50ft,or1 ~ 20m,inf
ANGLEOFVIEW:64°
MAGNIFICATION0.7x
COATING:PURPLE
NETWEIGHT:125gramsor4.4oz.
DesignedonCANON'sown
formula.Excellentforcolor
andblack-and-whitenegatives.
NORMALWIDE-ANGLE
CANONLENS
LENSELEMENTS:7
LENSMOUNT& HEAD: NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f : 22
DISTANCESCALES: 3.5~50ft,or1 ~20m,inf
ANGLEOFVIEW64°
MAGNIFICATION:0.7x
COATING:AMBER
NETWEIGHT:125gramsor4.4oz.
World'sfastestwide-anglelens(64°).
superblycorrectedforcolordefinition
andcurvature-freeresultatwideopen.
ThislensalsofeaturesCanon'snew
Spectra-coating,whichgivesadded
brillianceandatthesametimeim-
provedcolorquality.

NORMALWIDE-ANGLE
CANONLENS
LENSELEMENTS: 8
LENSMOUNT& HEAD: NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f:22
DISTANCESCALES:3.5~ 50ft,or1 ~20m,inf
ANGLEOfVIEW:64°
MAGNIFICATION:0.7x
COATING:AMBER
NETWEIGHT:185gramsor6.5oz.
Theamazingspeedofthef:1.5has
wontheworldwideclaimofpro-
fessionalphotographers.Thereisno
finerandfasterlenswiththisfocal
lengthandfield—of—view.
STANDARD
CANONLENS
LENSELEMENTS:4
LENSMOUNT& HEAD: NON-COLLAPSIBLE,
NON-REVOLVING
MINIMUMAPERTURE:f:22
DISTANCESCALES:3.5~ 50ft,or1~20m,inf
ANGLEOFVIEW:46°
COATING: MAGENTA
NETWEIGHT:142gramsor4.7oz.
Idealall-roundlensnotonlyforland-
scapes,portraiture,etc.,butalsofor
copying,enlargingworketc.Anex-
cellentlensforcoloraswellasblack-
and-white.