3d projection system using laser light sources

3D viewing glasses for use with a 3D projection system comprising a plurality of narrowband laser light sources including a first narrowband laser light source and a second narrowband laser light source, the 3D viewing glasses comprising:

• passbands each configured to transmit light of at least one narrowband laser light sources from the plurality of narrowband laser light sources when viewed through the glasses at normal angles and when viewed through the glasses at off-normal angles, wherein the passbands are each configured to transmit a central wavelength of the light from said at least one of the narrowband laser light sources at a location off-center relative to a central wavelength of the corresponding passband when viewed normally and, when viewed at increasingly off-normal angles, at other locations in the corresponding passband that are increasingly further from the location off-center and increasingly closer to the central wavelength of the corresponding passband;
• and
• a multi-passband configured to transmit light from the first narrowband laser light source and light from the second narrowband laser light source, the multi-passband comprising a first normal pass area at a short wavelength end of the multi-passband configured to transmit the light of the first narrowband laser light source when normally incident to the glasses, a second normal pass area configured to transmit the light of the second narrowband laser light source when normally incident to the glasses, a first off-normal pass area between the first and second normal pass areas configured to transmit the light of the first narrowband laser light source when incident at a range of off-normal angles to the glasses, a second off-normal pass area configured to transmit the light of the second narrowband laser light source when incident at a range of off-normal angles to the glasses.