Using The Condenser; Using The Iris Diaphragm; Cleaning And Maintenance - Bresser Science TFM-201 Bedienungsanleitung

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21 Using the condenser

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Illustration 8: Condenser
1 Condenser lens
3 Adjusting lever for iris diaphragm
The condenser is used to adjust the light bundling to the observed object in an optimal way. Light
bundling can be varied by moving the condenser hight adjustment.

22 Using the iris diaphragm

NOTICE
The iris diaphragm is used to increase the depth of focus.
With an open aperture more light is getting through but the depth of focus is less. With an partially
closed aperture the depth of focus is higher but it is neccessary to increase the brightness of the illu-
mination then.
It is recommended not to close the iris diaphragm to much when working with higher magnifications.
Otherwise the image resolution will decrease.
Move the lever for the iris diaphragm to right or left to change the aperture setting.

23 Cleaning and maintenance

– Protect the device against dust and moisture.
– Avoid putting fingerprints and equal contaminations on any optical surfaces.
– Make sure the residual moisture is fully eliminated before use.
– Disconnect the device from the power supply by pulling the power plug when it is not used or in
case of longer interruption of operation and before starting any work on maintenance and cleaning.
– Only use a dry cloth to clean the exterior of the device. To avoid damaging the electronics, do not
use any cleaning fluid.
– Do not use organic solvents (e.g. alcohol, ether, acetone, xylol or other dilutions) to clean
lacquered parts or plastic parts!
– Disassemble optical elements (e.g. objective, eyepiece, etc) before cleaning.
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2 Condenser hight adjustment
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