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10 Things I Should Be Doing for dark field photography, But That I Never Get Around To

dark field photography

What is Disadvantages of dark field photography?

A dark field microscope can result in beautiful and amazing images; this technique also comes with a number of disadvantages.

First, dark field images are prone to degradation, distortion and inaccuracies.
A specimen that is not thin enough or its density differs across the slide, may appear to have artifacts throughout the image.
The preparation and quality of the slides can grossly affect the contrast and accuracy of a dark field image.
You need to take special care that the slide, stage, nose and light source are free from small particles such as dust, as these will appear as part of the image.
Similarly, if you need to use oil or water on the condenser and/or slide, it is almost impossible to avoid all air bubbles.
These liquid bubbles will cause images degradation, flare and distortion and even decrease the contrast and details of the specimen.
Dark field needs an intense amount of light to work. This, coupled with the fact that it relies exclusively on scattered light rays, can cause glare and distortion.
It is not a reliable tool to obtain accurate measurements of specimens.
Finally, numerous problems can arise when adapting and using a dark field microscope. The amount and intensity of light, the position, size and placement of the condenser and stop need to be correct to avoid any aberrations.

Dark field has many applications and is a wonderful observation tool, especially when used in conjunction with other techniques.

However, when employing this technique as part of a research study, you need to take into consideration the limitations and knowledge of possible unwanted artifacts.

dark field photography

dark field photography lyme disease

 

Although this video clearly shows a spirochaetal shaped bacteria, it cannot identify what spirochaete it may be. To show that those bacteria are in fact Borrelia (the spirochaetal bacteria shown to cause Lyme borreliosis), proper DNA sequencing would have to occur.  From our perspective, if the person is sick and these are showing up in their blood, then treat the patient for a spirochaetosis while waiting for confirmation. Treatment is chosen within the patient/doctor discussion as to type of antibiotic and duration.  Infectious Disease Society of America (IDSA) guidelines are not recommended.  Current Canadian medical policy is to simply defer to the IDSA guidelines on matters of testing and treatment therefore we cannot recommend following Canadian medical policy in any province until patient expert’s opinion is given full and equal voice in the writing of Canadian medical policy relative to Lyme borreliosis.]

Slide 5

These video clips are from an experiment in which 11 friends provided a tiny amount of fingertip blood on a microscope slide.

All donors were met through patient support groups and have chronic illness.

8 of 11 have been ill for 20 years or longer.

9 have been diagnosed with M.E. or Chronic Fatigue Syndrome

10 of 11 had negative NHS tests for Lyme borreliosis – one was not tested.

9 had private tests that were positive.

These eleven donors represent a total of 235 years of illness and 170
years of lost productivity.

dark field photography

What is Conclusion about dark field photography

A dark field photography can offer brilliant, light images against a dark background of otherwise difficult to view specimens.

Most standard microscopes come with dark field capabilities or accessories to enable this illumination technique.

There are many practical applications of dark field, especially in the field of marine biology, in viewing the many specimens you cannot see using alternative techniques.

However, a researcher must keep in mind the potential issues and limitations that may arise from dark field illumination.

For further information, check out the many microscopy imaging techniques available.

dark field photography

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