Hi John51. Somehow my notifications weren't working so I missed this message, sorry.
What difference do the mounts make?
It depends what you would like to do with your images. Personally, I believe that the ultimate in 3D photography is backlight slides in a handheld viewer. To do this, you need to have some way of holding the film chips flat. Also, the left and right images must be transposed (cut apart and swapped) in order to properly view the stereo image. Mounting two film chips in a single stereo mount achieves several things:
- holds the film flat
- holds the film chips the appropriate distance apart to be viewed in a viewer
- sets the stereo "window" of the scene
- fixes the alignment of the image
You can also shoot negative film and make stereo prints. If you want to make prints, you probably will find it easiest to contact print the film, which can only be done with unmounted film. Myself (and the majority of MF3Ders) find prints much less immersive that slides, but they can be a lot of fun and they have the advantage of being reproducible, unlike a camera-original slide. Prints are also considerably more work than slides.
I have Clearfile neg holders that hold 3 strips by 4 frames. Open each end so ideal for storing stereo pairs. What's the best way to store mounted slides?
Every couple years, one of the members of our group has gotten polyester sleeves made to store mounted slides. As for containers, you can store the mounted slides however you like. The mounts fit in many cases designed to hold 3"x5" index cards (provided the cases are made a bit oversize), which is very convenient.
As for negs, I rarely shoot them for stereo. I use 4 strips by 3 frame sleeves by Print File to store my unmounted film. As I said above, the stereo pairs must be cut apart for viewing, so it doesn't really matter that the sleeves store strips that are a multiple of 2 frames. You'll have to cut the film between each stereo pair eventually. This can be done before or after printing if you are using negative film.
Keep in touch; I'd love to hear how you make out. And if you are ever interested in sharing your images and seeing the images of others, please consider submitting images to a traveling folio! I manage one of the two MF3D folios that circulate in North America and I'd be thrilled to have another member.