Schneider-Kreuznach — 240mm f/5.6 plasmat lens for 5x7/8x10 view cameras, Copal 1 shutter
The Symmar-S 240mm f/5.6 extended Schneider-Kreuznach's 1961 Symmar-S line toward 8x10 inch work, serving as a long-normal lens for 5x7 and a usable, if movement-limited, standard lens on 8x10. It was later updated as an Apo-Symmar.
Construction follows the family's six-element, four-group symmetrical plasmat formula, multi-coated, typically fitted in a Copal 1 shutter. Image circle is approximately 338mm at f/22, covering 5x7 with room to spare and 8x10 with only modest movements.
Its longer focal length compresses perspective slightly compared with the 150mm and 180mm siblings, useful for portraits and architectural details where a wide-angle look is unwanted, though corner performance still needs smaller apertures to sharpen fully.
Fewer copies reach the UK secondhand market than the more common 150mm/210mm, so prices can run a little higher. Inspect the shutter for smooth, accurate speeds, check for internal haze, and confirm the lens barrel threads onto the shutter without play.