Camera Work: A Photographic Quarterly (1911 (Heft 36))

Our name, backed by over half a century
of experience, is on all our products—
lenses, microscopes, field glasses, projec-
tion apparatus, engineering and other
scientific instruments.

These three photographs show-
ing different angles and sizes of
image were taken from exactly
the same spot with a Protar
Convertible Lens.

A rapid convertible Lens
of wide application
In this one lens, at a comparatively low
cost, you get the service of three lenses—
each adapted to a different kind of work.

$auscli[oml>^iss
Protar jens

This lens is composed of two Series VII
single Anastigmats.
The single elements are unexcelled for the large
variety of purposes requiring a long focus—me-
dium speed—as, for instance, landscape work,
architectural subjects, machinery and groups.
The doublet is a rapid Anastigmat more than twice as fast as
the ordinary camera lens, hence, adapted to all forms of in-
stantaneous work. Because of its large image circle it may
be used as a wide angle lens on larger sized plates.
In addition to the above advantages, as shown by the ac-
companying illustrations, this lens permits you to choose your
angle of view and size of image without changing your view-
point.
At small cost you can greatly multiply the possibilities of this
lens by the addition of other single Anastigmats. For example
—the addition of one single lens adds three lenses—making
six in all. The addition of two single lenses adds seven lenses
—-making ten lenses in all.
Our Booklet T answers the question “ What lens shall I
buy ? ” Write for it to-day.

Bausch & Ipmb Optical ©•
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