Leica 77, Brochure

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Glossary
Multifunction centrer drive The combination knob for the Leica
center drive feature performs two important functions : diopter com-
pensation and focusing. Because of its size, it is always easy to use as
a focusing wheel and it provides ergonomic handling and a steady
observation. The large diopter scale allows quick and convenient sett-
ing of your personal diopter value.
quick initial focusing
fine focusing
Televid dual focusing The dual focusing device
patented by Leica is incorporated in Leica spotting
scopes. Two separate focusing drums enable the
observer to perform a quick initial focusing follow-
ed by an accurate fine focusing to obtain an image
that is always perfectly sharp.
Removable, sliding eyecups with two click stops A newly de-
signed rotating sliding eyecup is used on binocular models Duovid
50 and 42, Ultravid 50, 42 and 32 and Geovid. It can easily be
removed for cleaning at any time and it has two click stops with
which different eye relief distances (AP positions) can be set indi-
vidually (with eyeglasses = retracted ; without eyeglasses = pulled
out). With its gently cushioning rubber element it guarantees long,
relaxed observation and for eyeglass wearers it provides secure
positioning without damaging the eyeglasses. The remaining Leica
binoculars are equipped with sliding eyecups that guarantee an
optimal eye relief.
Automatic Diopter Compensation ADC™
ADC™ (Automatic Diopter Compensation) ADC™ (Automatic Diopter
Compensation) is the eminent innovation in Duovid binoculars. ADC™
maintains the original diopter setting when you change the magnification
(from 8 x to 12 x, or from 10 x to 15 x as the case may be).