convertible lens

Convertible lenses for large-format photography often consist of Plasmat cells.

These are popular with field photographers who can save weight by carrying one convertible lens rather than two or three lenses of different focal lengths.

Older convertible lenses may not be corrected for chromatic aberration, making them unsatisfactory with color film.

The Kodak Type 025 Retina Reflex is an SLR camera with so called convertible lenses (German: Satzobjektiv), interchangeable lens components made by Kodak AG Stuttgart, Germany.

Convertible lenses, still used by large format film photographers (insofar as large format photography is used), consisting of two cells that could be used individually or screwed together, giving three-lenses-in-one, date back to at least the Zeiss Convertible Protar (Germany) of 1894.