Convertible lenses for large-format photography often consist of Plasmat cells.
2.
Older convertible lenses may not be corrected for chromatic aberration, making them unsatisfactory with color film.
3.
Some older cameras were fitted with convertible lenses ( German : " " ) of normal focal length.
4.
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.
5.
The lens was part of a group of four convertible lenses : 400mm f / 8, 600mm f / 8, 800mm f / 8, and the 1200mm.
6.
In a reversion to its previous markets, it has also made limited quantities of the PS945, a redesigned Pinkham and Smith portrait lens, and the Series XVa, a redesigned triple-convertible lens for 10? inch format.
7.
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.
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