Nikon Fisheye-Nikkor 6mm f/2.8 User manual

Fisheye-Nikkor
6mm
f/2.8
Nikon
INSTRUCTIONMANUAL
GEBRAUCHSANWEISUNG
MODE D'EMPLOI
MANUALDEINSTRUCCIONES
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EnglishPage10
Depth-of-fieldtablePage34
DeutschSeite16
ScharfentiefetabelleSeite34
FranijaisPage22
Tabledeprofondeurdechamp—Page34
EspanolPagina28
Tabladeprofundidaddecampo—Pagina34

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NOMENCLATURE
1DistanceScales
2DistanceIndex
3ApertureIndex
4ApertureScale
5MeterCouplingShoe
6Aperture-Direct-ReadoutScale
7
8
9
10
11
12
MeterCouplingRidge
ApertureIndexingPost
ApertureRing
FilterSelectorDial
FocusingRing
Base
FOREWORD
TheFisheye-Nikkor6mmf/2.8lenshasthewidestpictureangleofanylens
onthemarket-anamazing220degrees.Itrecordsnotonlyeverythingin
front,above,belowandtoeithersideofthelensbutalsoseesslightlybehind
itself.Multilayercoatingreducesreflection,thusminimizingflareandghost
images.Thisresultsinimprovedcontrastandexcellentcolorrendition.
Unlikeotherfisheyelenses,itfitsthecamerawithoutanyneedtolockup
thereflexmirrorandtakesfulladvantageofthereflexviewingfeatureof
NikonandNikkormatcameras.Thefocusingrangeextendsdownto0.9foot
topermitpinpointfocusingonforegroundobjectswhilethrowingtheback-
groundoutoffocusatlargeapertures,andtheaperturediaphragmoff/2.8
meansthattheviewfinderimageisextra-brightforeasyviewingandfocusing
evenindimlight.A setoffivefiltersisbuiltintothelensbarrel.
FISHEYELENSES
Theusualfisheyelenscoversa 180°hemisphereandproducesa circular
imageon film. Barreldistortionisconsiderable,sincethecircumferenceof
theimagecirclecorrespondstoa straightline.TheFisheye-Nikkor6mm
f/2.8capturesanextra40°ofpictureangleandrecordsthescenewith
varyingdegreesofdistortionintheformofa circularimage23mmin
diameter.
Likeotherfisheyelenses,theFisheye-Nikkor6mmf/2.8appliesthe equi-
distantprojectionformula(y= Cd) inordertoaccommodatetheextra-wide
pictureanglewithina fieldoffinitesize.Thezenithangleofanypointin
theimagerecordedonfilmisproportionaltoitsdistancefromthecenterof
theimage(seePhotogrammetry,page14).Thismakesthelenssuitablefor
scientificrequirementssuchasmeasuringthezenithorazimuthanglesof
astronomicalbodiesorrecordingclouddistributionpatternsinthesky.Itis
alsousefulinsurveyingworkwhichrequirescheckingthecameraposition.
Anditsextracoveragemakespossiblemoreaccuratemeasurementsof
greaterdetail overthe180° field. Thelensisalsowidelyusedforcreating
uniquespecialeffects.
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