Celestron 44320 Instruction Manual

Digital Microscope Kit

InstructIon Manual

Model #44320

ENGLISH

IntroductIon

Congratulations on your Celestron microscope purchase.
Your new microscope is a precision optical instrument,
made of high quality materials to ensure durability and
long life. It is designed to give you a lifetime of pleasure
with a minimal amount of maintenance.

Before attempting to use your microscope, please read
through the instructions to familiarize yourself with the
functions and operations to maximize your enjoyment and
usage. See the microscope diagrams to locate the parts
discussed in this manual.

The microscope provides high powers from 40x to
600x. It is ideally suited for examining specimen slides
of yeasts and molds, cultures, plant and animal parts,
fibers, bacteria, etc. You can also examine small and
thin objects at low powers such as coins, rocks, insects,

1. Zoom Eyepiece

2. Eyepiece Tube

various materials, etc. You can also explore the exciting
microscopic world by creating your own specimen slides.
An excellent book to get you started, which describes
various projects and activities along with techniques, is
“The World of the Microscope” by Usborne.

With the included digital camera and the software,
you can observe magnified images, capture video or
take snapshots.

The final section of this manual provides simple care
and maintenance tips for you to follow to ensure that
your microscope provides you with years of quality
performance, usage, and enjoyment.

Note: This product was designed and intended for
ages 13 and older!

11. Top Illuminator

3. Nosepiece

4. Objective Lens

5. Stage

6. Bottom Illuminator 7. Base

Standard Accessories Included with your Microscope

• 10x—20x Zoom Eyepiece

• 4x, 15x, 30x Objective Lenses

• Top Illuminator - LED

• Bottom Illuminator - LED

• Light Diffuser

• Digital Camera

• USB Cable – 1.1

• 3 Prepared Glass Slides, Hole (Clear) Slide,
2 Blank Glass Slides

10. Arm

9. Stage Clips

8. Focus Knob

Figure 1

• Honeybee Wing, Shrimp, Rock Pieces,
Tweezers, Needle Probe and Eyedropper

• CD-ROM – Software Installation

1

SpecIfIcatIonS — Model # 44320

Stage Plain Stage with metal clips — 74 mm x 70 mm (2.9” x 2.8”)
Zoom Eyepiece Glass optics. Power continuous from 10x to 20x
Focuser Coarse focus — dual knobs
Objectives All glass optics — see magnication chart for powers
Illuminator — Top Pen light style. Uses 2AAA batteries (user supplied)
Illuminator — Bottom Uses 2AA batteries (user supplied)

Nosepiece Triple with click stop

Camera Resolution VGA 640 x 480 pixels
Weight/Dimensions (with batteries) 22 oz. (624 g) — 5.25” x 3.13” x 9.75” (133 mm x 79 mm x 248 mm)

MagnIfIcatIon table

Use the following table to determine the magnification
of the different eyepiece/objective lens combination of
your microscope.

SettIng up Your MIcroScope

1. Take the Styrofoam container out of the carton.

2. Remove the tape from the Styrofoam container holding

the various parts in place.

3. Carefully remove the microscope and other parts from
the container and set them on a table, desk, or other
flat surface.

4. Remove the plastic bag covering the microscope.

5. Remove the plastic cap from the zoom eyepiece
Fig. 1 (1).

6. Install the batteries in the top illuminator Fig. 1 (11)
which uses two AAA batteries (user supplied). See the
image below Fig. 2 — Turn the top of the pen light (top
illuminator) counterclockwise to take it off. Next insert

the AAA batteries into the tube with the positive ends
going into the tube first. Screw the top of the pen light
clockwise until tight.

Objective Lens 4x 15x 30x
10x on Zoom Eyepiece 40x 150x 300x
20x on Zoom Eyepiece 80x 300x 600x

7. Install the batteries for the bottom illuminator in the

base Fig. 1 (7) of the microscope which uses two AA
batteries (user supplied). See image 3a, showing

the battery compartment closed at the back of the
microscope. Image 3b shows the batteries being

installed in the compartment (see the inside of the

battery compartment door to locate where the positive

(+) and negative (-) ends of the batteries go. Pull out on

the door to open it while holding the base firmly and
push firmly to close it after the batteries are installed.

Figure 3a Figure 3b

Figure 2

You are now ready to use your microscope for looking
at specimen slides or small objects through the zoom

eyepiece! For using the digital (CMOS) camera, installation

and operating instructions will follow later in this manual.

2

MIcroScope operatIon

Viewing a speciMen

Carefully place a specimen slide under the stage clips Fig.

1 (9) and center the specimen directly over the hole in the
center of the stage Fig. 1 (5) – Figure 4a shows the stage

area with the hole in the center and Figure 4b shows a
specimen slide centered over the hole in the stage. It will
take some experimenting to place slides or objects in the
center of the stage as the image you see is upside down

Figure 4a Figure 4b Figure 5

and reversed but after some usage you will have an easy

time centering. Read the sections below on Focusing,
Changing Power, and Illumination before proceeding.

You are now ready to focus and view the specimen, but first
you must take some precautions so you do not damage a
specimen slide or valuable object. When using the higher
powers while you are focusing, make sure that the objective
lens does not hit the slide or object being viewed.

Focusing & changing power (MagniFication)

Now that the specimen slide (or object) is placed directly
under the objective lens, use the focus knob Fig. 1 (8) to

focus on the specimen. Note that for very small objects,
you should set them on the clear slide with a recessed hold
in the center.

1. Always start with the lowest power (4x objective lens) and

have the zoom eyepiece at the 10x position, all the way

counterclockwise (when you are facing the microscope
from the front) until it stops, so that the total power is 40x
– this is the most useful power for solid objects.

2. For slightly higher power, you can rotate the knurled ring

on the zoom eyepiece (see Figure 5) clockwise to obtain
powers of 40x to 80x (or anywhere in between) as you

continue rotating to the 20x eyepiece position. Note
that you will have to refocus whenever you rotate the
eyepiece to obtain a sharp focus.

3. For much higher powers, you will have to rotate the

nosepiece Fig. 1 (3) to change the objective lens to 15x
(provides total power of 150x to 300x depending on what

position you have the zoom eyepiece in or 30x provides

total power of 300x to 600x). You rotate the nosepiece by

holding the microscope above the nosepiece with one

hand and rotate the nosepiece with the other hand until it
clicks at the position. Be cautious not to let the objective
lens touch the specimen slide or object when changing

to higher powers – you should turn the focus knob rst

to lower the stage to a low position. Note the power
range of the objective lens you are using is shown on the
nosepiece after it clicks into position.

4. At the highest powers, your views will be greatly
magnified but somewhat darker. The most enjoyable
views can be at the lower powers which have a wider
field of view and brighter illumination.

illuMination

To get the sharpest and best views, the illumination

(lighting) will have to be adjusted.

1. The top illuminator Fig. 1 (11) is used only for solid
objects (not specimen slides) so that light shines down
onto the object. Push the button on the top of the

pen light illuminator to turn it on/off. You can change
the brightness by moving the illuminator up/down or
by rotating it left or right. After some usage, you can
determine the best way of adjusting the light to provide
the most pleasant views.

3

2. The bottom illuminator Fig. 1 (6) is used for specimen

slides which shine up through the hole in the stage
through the slide. You can see a close up of the
illuminator in Figure 6a below. The illuminator is turned
on by rotating it so the light goes up through the hole.
You turn off the illuminator by rotating it down so that

the mirror is on the upper part (the mirror is not useful

with this microscope since you have the much better

electric illuminator).

3. The light from the bottom illuminator can be increased
or decreased by rotating it with very slight movements.

Figure 6a Figure 6b

As with the top illuminator, you will have to experiment
to provide the best lighting for the best views.

4. The bottom illumination may be too bright with some
specimen slides. Included with your microscope is a
light diffuser which reduces the brightness and glare
somewhat and can make the views sharper with a higher
contrast level. In Figure 6a the diffuser is the small black
piece. The diffuser fits over the bulb area by press fitting
it on. Figure 6b shows what the illuminator looks like
with the light diffuser in place. It will take experimenting
to get this right.

uSIng the dIgItal caMera for VIewIng and IMagIng wIth Your MIcroScope

Before using your microscope for viewing on your
computer screen or imaging, you will have to ensure the
driver is recognized by your computer. Your microscope

is a “Plug and Play” type where the computer should

automatically recognize the driver type on Microsoft

Windows 98/98SE/2000/ME/XP/Vista/Windows 7

operating systems as well as Apple MAC version 10.4.9
and later operating systems.

Plug the USB cable of the microscope into the USB port

of your computer. Each computer system will have slightly

different messages. For example, on some Vista OS
when plugged in the message may say “Installing Device
Driver Software” and shortly thereafter you may see a
message “Your Devices Are Ready to Use.” Just follow any

instructions shown on the screen.

You will need to install the VP EYE software (on Windows
OS’s) to actually view and/or image and prior to doing this

you will need to unplug the USB cable until the installation
is complete. You can also use other image/photo capture
software that you may have on your Windows system if you
desire. To use the microscope with MAC operating systems
you must use a MAC compatible image/photo capture

program (iChat with PhotoBooth, etc). To nd Photobooth

on a Mac, go to your hard drive and click on Applications.

Choose Photobooth from the list of applications. If a
camera is already attached to computer, Photobooth will

show up as your default. You will need to change this to
“camera or other designation.” You will then be able to
take photos with your microscope using the capture button.

Please note: Many keyboards on Macs have a USB port.
The microscope will not work through this USB port
because it does not have enough power. You will have
to connect the USB directly to your computer tower.

When viewing or imaging, you can change the orientation
of the image on the computer screen by rotating the
microscope to the position you desire.

installing the Vp eYe soFtware

Your microscope comes with VP EYE imaging software on
the CD-ROM which allows you to use your microscope for

visual purposes and for imaging with your computer when
using Microsoft Windows OS.

Before installing the software, remove the USB cable of the

Digital Camera from your computer and do not connect it
until the software installation is complete. Insert the CD­ROM into your CD-ROM drive and it should automatically
begin. Messages will appear (each operating system may
show something somewhat different) to guide you through

the installation process.
If the software did not begin automatically, double click on

“My Computer” and right click the CD-ROM icon and it

should start.

• You will see “Files Currently on the CD” and notice

“VP EYE” as a folder. Double click on it and then among
the choices double click on “Setup” (InstallShield
Setup Launcher).

• InstallShield Wizard will appear. Next, select the default

choices, “Next,” etc. until “Finish” is seen and click on it.

Your software was properly installed. You will have a

desktop icon called “VP EYE,” if not that will be the

program you select from your installed programs when you
want to use the digital microscope.

4

attachIng Your dIgItal caMera to Your MIcroScope

After installing the software, you are ready to attach your
camera to the microscope.

First, you need to remove the zoom eyepiece Fig. 1 (1)
from the eyepiece tube Fig. 1 (2) by turning it past the stop
at the 10x position. Put a little pressure on the eyepiece
(and one hand on the base for support) and continue

turning it counterclockwise to unthread it from the
eyepiece tube. Take the protective cap off of the camera.

Next, thread the camera into the eyepiece tube (clockwise)

until you feel it almost tight and quit. Lastly, you plug the
USB cable into an open USB port on your computer.

Figure 7a Figure 7b Figure 7c Figure 7d

When viewing or imaging a specimen slide or object, you
can change the orientation of the image on the computer

screen by rotating the camera to the position you desire –

generally do this counterclockwise so you don’t tighten the
camera in the eyepiece tube.

Left to right below – digital camera with USB cable (7a),
eyepiece tube (7b), camera attached to eyepiece tube (7c),

microscope with camera attached to a computer with the

USB cable (7d).

Vp eYe Software

The software package you installed is called VP-EYE.

The software allows you to observe specimen slides or
objects on your computer. When you view with the camera
installed, the magnification depends on the objective lens

you are using and also the size of your PC monitor.
Plug in the USB cable of the Microscope to your computer.
VP EYE contains basic image capture and organization for

your photos (snapshots) and videos. Click on the VP EYE

MagnIfIcatIon uSIng dIgItal caMera — eStIMateS

4x Objective using a 14” monitor — 340x using a 17” monitor — 400x
15x Objective using a 14” monitor — 1200x using a 17” monitor — 1380x
30x Objective using a 14” monitor — 2000x using a 17” monitor — 2400x

icon to begin (or from the programs in the Start menu of your
computer). The software is very intuitive and easy to use.

Note: The software package may not have some
of the programs listed due to the version of
this software package. You can print out a short
instruction sheet from the installed software. If you
need additional information about the software, visit
http://www.mmedia.com.tw.

5

care, MaIntenance, and warrantY

Your Celestron microscope and digital camera are precision optical instruments and should be treated with care at
all times. Follow these care and maintenance suggestions and your microscope will need very little maintenance
throughout its lifetime.

• When you are done using your microscope, remove any specimens left on the stage.

• Turn off the top and bottom illuminators when you are done using the microscope.

• If you will not be using your microscope for a long period of time, remove the batteries from the top and

bottom illuminators.

• Always place the dust cap over the eyepiece and the camera sensor when not in use or when being stored.

• Store the microscope in a clean, dry place.

• Be very careful if using your microscope in direct sun light to prevent damage to the microscope or your eyes.

• Never point the sensor on the camera towards the sun or the camera can be damaged and cease working.

• When moving your microscope, carry it by the “arm” with one hand.

• Clean the outside surfaces with a moist cloth.

• Never clean optical surfaces with cloth or paper towels as they can scratch optical surfaces easily.

• Blow off dust with a camel’s hair brush or an air blower from optical surfaces.

• To clean ngerprints off of optical surfaces, use a lens cleaning agent and lens tissue available at most photo outlets

and when cleaning do not rub in circles as this may cause sleeks or scratches to occur.

• Never disassemble or clean internal optical surfaces. This should be done by qualied technicians at the factory or

other authorized repair facilities.

• When handling glass specimen slides, use care as the edges can be sharp.

Your MIcroScope haS a two Year lIMIted warrantY.

pleaSe VISIt celeStron webSIte for detaIled InforMatIon

on all celeStron MIcroScopeS at www.celeStron.coM.

B

elow are a Few snapshot iMages taKen BY a Young teenager on his First atteMpt using the Vp eYe soFtware.

Winter Jasmine Leaf Winter Jasmine Leaf U.S. Penny
with 4x Objective with 15x Objective with 4x Objective

Year Tilia Stem Year Tilia Stem Rock
with 4x Objective with 15x Objective with 4x Objective

6

www.celestron.com

FCC Statement

This device complies with Part 15 of FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and

2. This device must accept any interference received, including interference that may cause undesired operation.

2835 Columbia Street • Torrance, CA 90503 U.S.A.
Telephone: [phone] • Fax: [phone]

©2011 Celestron

All rights reserved. • Printed in China • 01-11

Product design and specications are subject to change

without prior notification.

Designed and intended for those 13 years of age and older.

Kit microscope numérique

GUIDE DE L’UTILISATEUR

MoDèLE n° 44320

FRANÇAIS

IntroductIon

Nous vous félicitons d’avoir fait l’acquisition de ce
microscope Celestron. Votre nouveau microscope est
un instrument de précision optique fabriqué à partir de
matériaux d’excellente qualité pour lui assurer une grande
durabilité et longévité. Il est conçu pour vous donner une
vie entière de satisfaction avec un entretien minimum.

Avant de tenter d’utiliser votre microscope, veuillez lire
attentivement le mode d’emploi afin de vous familiariser
avec ses différentes fonctions et son mode opérationnel et
d’en profiter ainsi pleinement. Reportez-vous aux schémas
du microscope pour étudier les différentes pièces dont il
est question dans ce manuel.

Ce microscope offre des grossissements puissants de
40x à 600x. Il convient parfaitement à l’observation
d’échantillons de levures et de moisissures, de cultures,
d’éléments végétaux et animaux, de fibres, bactéries et
autres. Vous pouvez aussi examiner des objets fins et de
petite taille avec des grossissements moins importants,

1. Oculaire zoom

2. Tube de l’oculaire

notamment des pièces, des pierres, des insectes, des
matières diverses, etc. Et enfin, vous pouvez créer vos
propres lames porte-objets pour explorer davantage les
fascinantes observations permises par le microscope. Pour
vous aider à vous familiariser avec votre microscope, nous
vous recommandons l’excellent livre d’Usborne, « The
World of the Microscope », qui indique différents projets et
activités ainsi que les techniques à employer.

Grâce à l’appareil photo numérique et au logiciel livrés
avec, vous pouvez observer des images grossies ou encore
capturer des vidéos ou prendre des photos.

La dernière partie de ce manuel offre des conseils de
nettoyage et d’entretien faciles à suivre pour augmenter la
qualité de la performance de votre microscope et l’utiliser
avec satisfaction pendant des années.

Remarque : Ce produit a été conçu et s’adresse à des
personnes de 13 ans ou plus !

11. Illuminateur supérieur

3. Tourelle

4. Objectif

5. Platine

6. Illuminateur inférieur 7. Socle

Accessoires standard livrés avec votre microscope

• Oculaire zoom 10x – 20x

• Objectifs 4x, 15x, 30x

• Illuminateur supérieur - LED

• Illuminateur inférieur - LED

• Diffuseur

• Appareil photo numérique

• USB Cable – 1.1

• 3 lames porte-objets préparées, une lame

à trou (transparente), 2 lames vierges

10. Bras

9. Pinces valet

8. Bouton de mise au point

Figure 1

• Aile d’abeille, crevette, fragments de
pierre, pinces à épiler, sonde à aiguille et
compte-gouttes oculaires

• CD-ROM – Logiciel d’installatio

1

SpécIfIcatIonS — Modèle n° 44320

Platine Platine simple avec pinces valet métalliques –
74 mm x 70 mm (2,9 po x 2,8 po)

Oculaire zoom Éléments optiques en verre Puissance continue de 10x à 20x

Dispositif de mise au point Mise au point grossière – doubles boutons
Objectifs Éléments optiques tout en verre – voir le tableau de grossissement

concernant les différentes puissances

Illuminateur – supérieur Type lampe-stylo. Fonctionne avec 2 piles AAA (fournies par l’utilisateur)
Illuminateur – inférieur Fonctionne avec 2 piles AA (fournies par l’utilisateur)

Tourelle Triple avec butée à déclic
Résolution de l’appareil photo VGA 640 x 480 pixels
Poids/dimensions (avec piles) 624 g (22 oz) — 133 mm x 79 mm x 248 mm (5,25 po x 3,13 po x 9,75 po )

tableau de groSSISSeMent

Utilisez le tableau ci-dessous pour déterminer le
grossissement des différentes combinaisons d’oculaires/
objectifs de votre microscope.

InStallatIon de votre MIcroScope

1. Sortez la boîte en polystyrène expansé du carton.

2. Retirez le ruban adhésif qui sert à maintenir en place les
différents articles dans la boîte en polystyrène expansé.

3. Retirez délicatement le microscope et les autres pièces
et installez-les sur une table, un bureau ou toute autre
surface plane.

4. Retirez l’emballage plastique protégeant le microscope.

5. Retirez le cache en plastique de l’oculaire zoom (1)

(Figure 1).

6. Installez les piles dans l’illuminateur supérieur (11)

(Figure 1) qui nécessite deux piles AAA (fournies
par l’utilisateur). Voir illustration ci-dessous (Figure

2) — Tournez la partie supérieure de la lampe-stylo
(illuminateur supérieur) dans le sens inverse des aiguilles
d’une montre pour la retirer. Insérez ensuite les piles
AAA dans le tube en introduisant les bornes positives
en premier. Vissez la partie supérieure de la lampe­stylo dans le sens des aiguilles d’une montre jusqu’à ce
qu’elle soit bien serrée.

Objectif 4x 15x 30x
10x sur l’oculaire zoom 40x 150x 300x
20x sur l’oculaire zoom 80x 300x 600x

7. Installez les piles de l’illuminateur inférieur dans le socle

(7) (Figure 1) du microscope qui nécessite deux piles AA

(fournies par l’utilisateur). Voir l’illustration 3a montrant
le compartiment à piles refermé au dos du microscope.
L’illustration 3b indique comment installer les piles dans
le compartiment (voir sur l’intérieur du couvercle du
compartiment à piles le positionnement des bornes
positives (+) et négatives (-) des piles. Tirez sur le
couvercle pour l’ouvrir tout en maintenant fermement le
socle puis, une fois les piles en place, appuyez dessus
fermement pour le refermer.

Figure 3a Figure 3b

Figure 2

Vous pouvez maintenant utiliser votre microscope pour
observer des lames porte-objets ou des petits objets
à l’aide de son oculaire zoom ! Le mode d’emploi et
l’installation de l’appareil photo numérique (CMOS) sont
indiqués plus loin dans ce manuel.

2

fonctIonneMent du MIcroScope

observation d’un échantillon

Placez délicatement une lame d’échantillon sous les pinces

valet de la platine (9) (Figure 1) et centrez l’échantillon

directement sur l’orifice situé au centre de la platine (5)

(Figure 1) – La Figure 4a ci-dessous représente la partie
platine avec son orice central et la Figure 4b une lame

porte-objets centrée sur l’orifice de la platine. Il faut
expérimenter au départ pour bien placer des lames
ou des objets au centre de la platine étant donné que
l’image observée est à la fois renversée et inversée, mais
ce centrage deviendra beaucoup plus facile à effectuer

Figure 4a Figure 4b Figure 5

avec un peu de pratique. Lisez les rubriques ci-dessous
concernant la mise au point, le changement de puissance
et l’illumination avant de poursuivre.

Vous pouvez maintenant effectuer une mise au point
et observer l’échantillon, mais vous devez néanmoins
prendre certaines précautions préalables pour éviter
d’endommager une lame porte-objets ou un objet de
valeur. Si vous utilisez des puissances de grossissement
élevées lors de la mise au point, vérifiez que l’objectif ne
touche ni la lame ni l’objet observé.

mise au point et changement de puissance
(grossissement)

Maintenant que la lame porte-objets (ou l’objet) est placée
directement sous l’objectif, utilisez le bouton de mise

au point (8) (Figure 1) pour effectuer la mise au point de

l’échantillon. Veuillez noter que les objets de très petite
taille doivent être placés sur la lame transparente avec
partie creuse centrale.

1. Commencez toujours par la puissance la plus faible
(objectif 4x) et l’oculaire zoom sur la position 10x (en
fin de course dans le sens inverse des aiguilles d’une
montre ([lorsque vous faites face à la partie frontale du
microscope] jusqu’à ce qu’il ne puisse pas aller plus loin)
afin d’obtenir une puissance totale de 40x., qui est la
puissance la plus utile pour les objets solides.

2. Pour obtenir une puissance légèrement supérieure, vous
pouvez tourner la bague moletée de l’oculaire zoom

(voir Figure 5) dans le sens des aiguilles d’une montre

pour obtenir des puissances de 40x à 80x (ou toute
puissance intermédiaire) en continuant à tourner jusqu’à
la position 20x de l’oculaire. Veuillez noter que vous
devrez refaire la mise au point chaque fois que vous
tournez l’oculaire afin d’obtenir une image nette.

3. Pour des puissances d’observation beaucoup plus

élevées, il faut tourner la tourelle (3) (Figure 1) de

manière à amener l’objectif sur le chiffre 15x (puissance
totale de 150x à 300x selon la position sur laquelle
se trouve l’oculaire zoom, ou sur 30x qui offre une
puissance totale de 300x à 600x). Tournez la tourelle
d’une main tout en maintenant de l’autre main le

microscope au-dessus de celle-ci et ce jusqu’à ce que
la tourelle s’enclenche en position. Veillez à ce que
l’objectif ne touche pas la lame porte-objets ou un objet
lorsque vous passez à des puissances de grossissement

plus importantes – pour éviter cela, tournez d’abord

le bouton de mise au point de manière à abaisser la
platine. Remarque la plage de puissance de l’objectif

que vous utilisez est indiquée sur la tourelle une fois
qu’elle s’est enclenchée en position.

4. L’utilisation des puissances de grossissement les plus
élevées donnera toutefois des objets un peu plus
sombres. Les meilleures observations d’objet sont
généralement obtenues en utilisant des grossissements
plus faibles qui offrent un champ de vision plus étendu
et une meilleure illumination.

éclairage

Pour que les objets observés soient aussi nets et
précis que possible, il sera nécessaire de régler
l’illumination (éclairage).

1. L’illuminateur supérieur (11) (Figure 1) est utilisé

uniquement pour des objets solides (et non les lames
porte-objets) afin que la lumière brille sur l’objet.
Appuyez sur le bouton situé en haut de l’illuminateur
de la lampe-stylo pour la mise en marche/l’arrêt. Pour
modifier la luminosité, il suffit de déplacer l’illuminateur
de haut en bas ou de le tourner à gauche ou à droite.
Avec un peu de pratique, vous parviendrez à déterminer
le meilleur moyen d’ajuster l’éclairage de manière à
obtenir une excellente image des objets observés.

3