Manufacturer's product description:
These small opera glasses are elegantly finished in a gold and white design eminently suitable for use at the theatre or at the opera.
The opera glasses have 3X magnification and a 25mm objective diameter. They have a fixed focus which avoids having to adjust the focus. They have a small red lamp in the middle for reading the programme. The internals are of the classical Galileo optical system design providing a sharp image, particularly in the centre. This means that the glasses can be kept very compact.
Our expert comment:
These opera glasses follow the Galileo system. They have the advantage of extreme compactness, without the need for prisms. However, the exit pupil lies inside the instrument leading to the edge of the field of view being rather ill defined. This feature is typical of Galileo systems.
If sharpness right out to the edge of the field of view is wanted then the, not quite as elegant, classic design of binoculars is needed. For use at the opera or theatre, these opera glasses are fully sufficient.
(Marcus Schenk)
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