Beseler Negaflat 5x4 in.
The Negaflat ® carrier is an attempt at producing a glassless negative carrier that is not subject to negative sag or ‘popping’ due to temperature changes. It works by gripping the rebates of the negative and drawing it taut using spring jaws. There is a potential for damage with soft emulsion, though it does not seem to occur in normal use. The benefit over a glass carrier is fewer dust collecting surfaces. It is a definite improvement over the standard clamping 5x4 carrier.
Negaflat with jaws fully open.
Negaflat corner showing gripping flange and the corner spring.
Negaflat with negative in place. The flange nearest the negative grips the film, and the upper flange pulls it outward against the springs when the device is closed.
Negaflat with negative under tension and held flat.