Opticron Aurora BGA - Manual (Page 4)

Binoculars can open up a whole range of new and exciting impressions
when travelling on holiday, taken to sporting and leisure events or used as
part of a hobby such as birdwatching or astronomy. To help you get the
best results from your equipment please read the following instructions
carefully.
Adjusting to obtain a single picture. To adjust to the spacing of your eyes
simply rotate the two sides of the binocular around the centre hinge until a
single rounded picture is obtained when looking through both eyepieces.
Adjusting for maximum sharpness. Many people have slightly different
vision between their eyes. When using binoculars, this difference can be
compensated for by turning the dioptre adjustment ring located on the
right eyepiece tube.
To set the binoculars correctly, close your right eye and look through the
left eyepiece with your left eye and using the centre focus wheel - focus on
an object of your choice until it is clear and sharp. Next, close your left
eye and look through the right eyepiece with your right eye. You may find
the object being viewed is not absolutely sharp and this can be corrected
by rotating the dioptre adjustment ring (but without turning the centre
focus wheel) until the object being viewed becomes sharp. The binoculars
are now set and a perfectly clear and sharp image should be attainable
when using both eyes together. To focus at different distances simply turn
the centre focus wheel.
User Instructions