Rogelio,
For these images, I removed the condenser from it's holder, then positioned the fiber light under the stage pointing up at the underside of the slide from the side. This produced a darkfield effect. If I had not turned on the halogen lamp on the scope and run it through the green filter built into the base, the background would have been black.
I was actually trying for Oblique illumination, which I did get when positioning the fiber light above the stage and at a low angle. But, I had to remove the coverslip, otherwise I got nothing. this worked on a dry subject, but I don't know if it would work on a drop of water with no coverslip.
I do have ping pong balls, and little opaque plastic cups that I got just for this purpose though, and will try it next. Will this transmit the light even with a coverslip in place? My lenses call for an 0.17 coverslip, and I think the image quality suffers without them.
I really don't understand how to get oblique lighting though. I know what it looks like, when others post images using it, but I can't seem to get the Fluophot to do it. Any tips would help.
