Improving your image: dental photography in practice

The Week 1 test.

This is the test from the first week of the FutureLearn / University of Birmingham course on dental photography
https://www.futurelearn.com/courses/dental-photography-in-practice

It includes expanded feedback for all the choices, and some comments about the questions. You can click on "wrong" answers to see relevant feedback.

1. The best image format to save clinical pictures is:



 
 


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Our guidance is to use the jpeg for all practical purposes, and safely archive the RAW in the unlikely event that it is ever needed for legal reasons, and as a backup if you accidentally delete the jpeg.
There is a lot of debate about whether RAW or jpeg is "better", or whether lossless formats like TIFF should be used instead of jpeg. These debates are of more interest to professional photographers and forensic investigators.

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2. We recommend a DSLR camera on the course. SLR stands for:


 
 


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In days of old, there were twin lens reflex cameras. The lower lens passed the image onto the film, the upper lens REFLECTED the image onto a horizontal glass screen, and was viewed by looking vertically downwards into the camera hood at the top.

Twin lens reflex camera

The invention of the single lens reflex camera was a major advance in photography.


OK ▲


3. To set up your Flickr account, what email address must you use?



 
 


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Be aware that whatever file sharing site you use, it is likely that personal data will be gathered about you. 

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4. Identify which of the following is an advantage of compact cameras for clinical photography.


 
 


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A proper clinical camera setup is a fantastic investment, and will change the way you practise dentistry greatly for the better. Our experience is that other types of camera will cause you frustration, and you may have an initial burst of enthusiasm for dental photography, but it fades shortly afterwards... 

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5. Which of these mirrors can be used for good intra-oral dental photography? (Multiple answers allowed)
T F
Front-coated dental mirror 

T F
Back-coated dental mirror 

T F
Front-coated occlusal mirror 

T F
Back-coated occlusal mirror 

T F
Polished all-metal mirror 


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When mirror images are taken, it is the convention to show them "the right way round". Use a photo editor to flip the image horizontally (i.e. "mirror" the mirror view).
When a small mouth mirror is used, and much of the mouth is visible in the shot, you need to be careful. Either crop the image so only the mirrored tooth is visible (then flip and rotate it so it is level), or leave the picture as it is so it is obviously a view of a mouth with a small mirror in it.

OK ▲



6. Which of these are features of the ideal lens for dental photography? (Multiple answers allowed)
T F
Prime 

T F
Zoom 

T F
Macro 

T F
Wide angle 

T F
Telephoto 

T F
Standard 


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The Prime Macro Telephoto lens is the gold standard for dental photography.

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7. The ideal lens for dental photography has a fixed focal length lens that is:


 
 


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Another potential problem with 200mm is that you need a much more powerful flash as you are twice as far away.

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8. Which of these applies to a suitable flash for high quality dental photography? (Multiple answers are allowed)
T F
Can be an LED type   

T F
Should be set weak enough to allow natural light to mix with the flash 

T F
Should be set strong enough to prevent most natural light from mixing with the flash

T F
Must be circular in shape


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Possibly a little unfair saying multiple answers allowed when only one was correct, but if we said only one, it would obviously just be a decision between the second and third choices.

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9. Which of the following features are desirable in a DSLR camera body for intra-oral dental photography? (Multiple answers allowed.)
T F
Automatic settings for close up photography  

T F
A Live View LED screen 

T F
Image stabilisation to prevent blurring 

T F
HD Video

T F
Flip-out LCD Screen


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The features are covered in Mike's video at https://www.futurelearn.com/courses/dental-photography-in-practice/steps/3026/progress . Again, maybe a little unfair saying multiple answers allowed when only one was correct.

OK ▲



10. When a dental photograph has been resized to use on the web, which of these formats is suitable? (Multiple answers allowed. You may need to do some independent searching.)
T F
JPG  (jpeg) 

T F
RAW 

T F
BMP (bitmap) 

T F
GIF (graphics interchange format) 

T F
PNG (portable networks graphic)


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JPG and PNG are the only photographic image formats supported by all browsers. PNG is a lossless format, so big files that can take a long time to download and display. JPG is much faster to display, although too much compression can reduce the quality. 

OK ▲



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