I'm a fan of Anti Newton 4x5 Glass Carriers. They work with all formats up to 4x5! I just cut an opaque mask around the smaller format negs to prevent flare and center the cut out to keep the film in the center of the light source cone to allow me the use of that formats normal lens. Keeping the six surfaces dust free can take a little work and a humidifier in the room will help keep the air relatively static free and the environment is much more pleasant to work in.

Bill LaPete