Re: Was wirklich zählt
Hallo Steve, hallo Witold,
hier ein kurzer Hinweis auf Holger Merlitz´ Einschätzung aus seinen "Collected wisdoms"
Binocular purchase: Collected wisdoms. Leider "nur" auf Englisch - allerdings sehr ungeschraubt.
"Wisdom No. 3:
Over the decades, the quality of coating was the most influential factor for optical performance
Already during the 1930s, top performance binoculars were engineered for military use. During WWII, some of them were equipped with a single layer anti-reflection coating, which was since then continually improved, leading to better contrast, brightness and color rendition. The introduction of multi-layer coating in the late 1970s has caused another performance boost. Since that time, the color saturation of the image reached that high level we are used to find with modern optics. Binoculars of roof-prism type experienced a final performance jump in the late 1980s when the phase-shift coating was introduced. Since that time (but not before), the best roof prism binoculars approached the contrast offered by high-end Porro prism glasses. This historical development had its implications on the performance of ancient binoculars, regardless of their quality. For example, the Porro binoculars made by Zeiss (Oberkochen) in the 1950s were excellent enough to be even competitive with today's high end binoculars - if they just had a modern coating. With the technology available at that time, however, their colors appeared rather pale when compared to a modern binocular. This is the rule of thumb for anybody who is looking for a second hand binocular with maximum performance: If it is a Porro, it should be made after 1980 (availability of multi layer coating), if it is a roof prism, not earlier than 1990 (phase-shift coating)."
Es gibt bezüglich mechanischer Qualität auch bessere (und teurere) Ferngläser chinesischer Provenienz. Bei limitiertem Budget wird man also nach einem Kompromiss (noch hinreichende Mechanik - Kontrastleistung) Ausschau halten? Bei Deep Sky-Beobachtungen ist Kontrastleistung und d.h. Vergütungsqualität und Fehllichtunterdrückung einfach essenziell.
LG
Herbert