Lots of folks have talked about doing a higher-end spectrometer attachment based on an SLR lens mount. This is a good idea -- we can model it and share the model on Shapeways so people can 3D print it.
To start out with, I did a quick survey of open source Thingiverse models of camera lens mounts and lens caps:
- Lens adaptor for tilt-shift, for Canon EOS cameras: http://www.thingiverse.com/thing:36173
- Canon 51mm inner diameter lens cap: http://www.thingiverse.com/thing:110870
- 50mm Canon EF extension tube: http://www.thingiverse.com/thing:74217
One thing I'm not sure about -- will take some testing -- is whether we want to make an attachment for the front of a lens -- lens-cap style -- or to attach directly to the body of the camera, which would have no lens. I'm not sure the latter would work with our current spectrometer design... the geometry may be pretty different. I also don't have an SLR :-P