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  • Subject Name : Forensics

Online Practical Activity and Camera Simulators

1-A: How does the focal length affect the field of view?

It is the focal length that defines the angular field of lens of view. If the sensor size is given then the angular field depends on the focal length. If the focal length is shorter than the angular field will also be shorter.

1-B: For the same focal length, how does a crop sensor affect the field on view?

Distance of the object and distance of aperture should be same. The depth is the field is depending on the crop sensor. Rather than using short focal length we can use distance to the object. We required to go 16 times farther from the object to get the similar angle of view.

2-A: What effect has the aperture on the image?

Various affects aperture has including, brightness of images, exposure of images. If the size of aperture changes, it affects the overall light and reaches to the camera sensor and that is why brightness of your image.

2-B: What effect has the ISO sensitivity on the image?

The effect of ISO sensitivity helps in amplifying the electronic signal, that helps the noise when the signal amplifies. The higher the ISO sensitivity and the effects are more obvious of noise on the images.

2-C: In Av mode, why does the Shutter speed values move in the opposite direction?

The faster the values of shutter, the faster is the image gets captured. If we increase the shutter value the background of the picture becomes more blur. Shutter speed affects the speed of moving objects.

2-D: In M mode, what does an exposure meter value of -3 indicates?

If the sensitivity of ISO increased then in M mode, the value in exposure meter increases. Here an exposure meter value of -3 indicates the under exposure of the image.

3-A: What is the main visual difference between the two images (f/2.8 and f/16)?

If the f stop number is high, the image foreground and background becomes very sharp and if the f stop number id low then the image foreground and background becomes blur.

3-B: What is the main visual difference between the two images (1 sec and 1/4000)?

Time difference the fast-moving object or it will keep on showing the movement of the image with a slower shutter speed such as 1 second. At 1/4000 sec the image is very underexposed and at 1 second image is very overexposed.

3-C: Why the shutter speed had to be changed from 1/6 to 1/1500 between the images taken at ISO 100 and 25600?

If the image is under exposure then it is necessary to increase the ISO. The shutter speed has to change because of the brightness of the image. Higher the ISO, graininess cause to the image.

4-A: With a focal length of ~40 mm, adjust the parameters to take an image showing the subject and the background in focus, with all movements frozen and little noise.

Depth of the field is get affected by the focal length. The shorter focal length focused on shorter distance. So, it is needed to adjust the parameters of the image that needs to be taken showing the object and the background in focus with all the movements frozen and little noise.

4-B: With a focal length of ~40 mm, adjust the parameters to take an image showing the subject and the background in focus, with motion blur and little noise.

Sharp pictures are very interesting and appealing than soft images. If the shutter is longer then it would generate the blurry images. If the object is moving , it could also produce blur motion. If the ISO set to at high number than it also produce the motion blur.

4-C: With a focal length of ~40 mm, adjust the parameters to take an image showing the subject in focus with a blurry background, the girl should be sharp but not the fan, and little noise.

There are three reasons for making the background blur, one is aperture, second is focal length of the lens and the third is how much the distance between the object and the background.

Remember, at the center of any academic work, lies clarity and evidence. Should you need further assistance, do look up to our Digital Forensic Assignment Help

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