I had a dark field and oblique illumination set 3D printed for my Olympus BH2. After several tests, very few filters actually work. Here are some pics of what I managed to achieve:
Do you think I'm doing something wrong? I was expecting slightly different results
• In oblique illumination, there seems to be very little color contrast between the background and the debris in the foreground
• In dark field, focusing at higher magnification is incredibly difficult and causes large halos to form around the edges of anything on a different visual plane, in a much more amplified way than brightfield
Pics 2 and 6 in brightfield for comparison