Newsflash! The photos below show a slide viewer that allows you to view a single slide with both eyes. It might have similar optics to the device in this Instructable. I suggest trying the following:
1. order a slide viewer on e-bay for $10-20.
2. cut the viewer in half along the slot for the slide.
3. cover the eye holes with the red and blue colored filters.
4. put your camera where the slide goes and take a photo.
Please let me know if this works.
Step 1: Before you start...
Step 2: Gather the supplies.
+ Black mat board from an art store.
+ Red filter material that matches the filters on the 3D glasses (Roscolux #26 matches typical stock glasses available at a stage lighting store)
+ Cyan (blue) filter material that matches the filters on the 3D glasses (Lee #354 matches the cyan filters on most stock glasses available at a stage lighting store)
+ Some 5mm or 1/4" fiberboard.
+ Beamsplitter (50%) 76x102x3mm (Anchor Optical B27122)
+ Mirror 76x114x3mm (Anchor Optical B20850)
+ Four matching (76mm) posts (optional)
+ A sharp utility knife
If the optics listed above aren't available, try to purchase optics with similar dimensions. Anchor Optics is a cheap source:
Beamsplitters (find a beamsplitter about a 50/50 reflection/transmission ratio)
Try to find a mirror with a matching height to the beamsplitter:
You would need to adjust the mirror and beamsplitter holder to fit the new dimensions (i.e. the grooves should accommodate the thickness and the height and width might change). If you make one with different optics, please let me know how it works.