How are Zingraff opera glasses maintained today?

Maintaining Zingraff opera glasses involves careful cleaning and storage. Lenses should be wiped with a soft cloth to avoid scratches. Metal parts can be cleaned lightly to remove dust, though heavy polishing may damage original finishes. The focusing mechanism should be handled gently, as older components can wear over time. Storage in a dry place helps prevent corrosion. Original cases provide protection, especially if lined with fabric. Collectors often avoid repairs that alter the original structure. Preserving authenticity is a priority. Regular inspection helps keep the glasses in working condition. With proper care, many examples from the 19th century remain usable today.