A small disk added to the microscope that blocks some light from the illuminator, creating a cone pattern of light that focuses directly on the specimen. 

Darkfield Microscopes are very similar to bright field microscopes except with the addition of an opaque light stop. It produces light images on a dark background, which is good for viewing specimens without staining. 

Darkfield Microscope

https://openstax.org/details/books/microbiology/

Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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