3D printed in Black hard and durable resin NOT CARD
size is 32mm x 1.75mm thick
A Review Of the Filters can be found here
https://microscopyfiltersbypedropires.blogspot.com/
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In oblique illumination, direct light is restricted to a single azimuth, striking the specimen from only one direction rather than bathing it with an even distribution of light. The net effect is to reveal details in pseudo-relief to produce a shadowed effect on the side opposite the light source and bright specimen highlights on the side nearest the illuminator
https://en.wikipedia.org/wiki/Dark_field_microscopy
http://www.microscopy-uk.org.uk/dww/articles/oblique.htm
Any questions do not hesitate to contact me
EDITED Increasing quantity to 9 off 5 off Dark field and 4 off Oblique as can be seen, price the same.
Using Darkfield filter stops
1. Make a wet mount slide of diatomaceous earth and view it using the low-power objective.
2. Select the patchstop for the low-power objective. Slide it between the filter holder and the rest of the condenser, starting at the corner with the black circle. Note: If your microscope does not have a filter holder, hold the patchstop beneath the condenser.
3. Remove the eyepiece and set it somewhere clean and safe.
4. Open the diaphragm completely and look through the opening left by the missing eyepiece. Adjust the patchstop until the light is completely blocked. Note: If your microscope does not have a condenser, you must secure the patchstop in place with tape once you have it properly adjusted.
5. Replace the eyepiece.
6. View the slide and compare the image to the original.