Bresser 5790500, Instruction Manual

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All parts:

1

 Eyepiece

2

  Eyepiece socket

3

  objective revolver

4

  On/Off switch

5

  Object stage

6

  Object stage-Adjustment

7

  Focussing wheel

8

  Battery compartment cover

9

  Fixing screws for battery compartment cover

10

  Object stage with object plate

11

  Object fixing clamp

1. Choosing a place for the microscope

Before  starting,  choose  a  sufficient  location  for  microscoping.  Please  take  care  that  your 

microscope stands on an even and solid ground.

2. Getting started 

The expedition microscope is preassembled and ready to use. Before use, just insert the supplied 

10x eyepiece in the eyepiece holder and 2 batteries (type AA, 1.5V) in the battery compartment. 

Open the battery compartment cover by loosening the two knurled screws and slide the cover 

plate away to the side. Insert the batteries as required and close the cover again.

Pull the eyepiece holder out and lock it in the upper position by a ¼ turn counterclockwise. 

This is the only way to reach proper focus, otherwise the travel of the focus mechanics will not 

be sufficient. Insert the eyepiece into the eyepiece socket. Insert a microscope slide into the 

clamp of the stage. The specimen with cover glass is inserted upright (i.e. cover glass on top). 

The objectives are suitable for slides with thickness between 1.0-1.5mm. No special plankton 

chambers etc. with cover glass bottom are required, thus reducing material cost significantly.

3. Observation

Switch on the light with the toggle switch. Start with the lowest magnification (4x objective) 

to scan through your sample. The objectives 4x and 10x produce an image with a type of 

dark field contrast, i.e. sample components appear bright against a dark background. The 40x 

objective is equipped with a phase ring so that samples are viewed in phase contrast. Objects 

appear brightly contrasted against a grey background. In phase contrast, even the smallest, 

colourless and translucent objects and organelles (e.g. flagella) can be detected more easily 

than in brightfield. For plankton this is the method of choice.

To store or transport the microscope in the smallest space possible, the microscope can 

be disassembled without tools. Loosen the knurled screws that connect the illumination 

housing with the base, and then loosen the knurled screws on the cross table and remove the 

crosstable. Store microscope body and parts in a padded bag or case.

If the illumination in the field is not ready (e.g. batteries empty), the microscope can also be 

operated with ambient light only. To do this, simply remove the housing of the illumination. The