Newcon Optik 150 - Manual (Page 7)

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ƒ Do not take the cover off the lens unless necessary.
ƒ Keep away from heating appliances and central heating.
ƒ Do not apply excessive force to lens assembly, agile
elements and thread connections.
ƒ Due to considerable optical magnification of the eyepiece
some small structures inside the tube coating in the form
of dark and/or white points may be seen in the field of
view; this does not affect the capabilities of the device;
ƒ The device resolution may change from the center
towards the perimeter of the field of view. This is an
inherent feature of the image tube type utilized in the
device.
ƒ Remove the battery during periods of non-operating and
when storing the device for a long period of time.