Assignment 2

1. Calculate the aperture diameter for each lens aperture: 

The smallest focal length of my first zoom lens is 18mm:

Focal Length	Aperture Size	Aperture Dimension
18mm	4	4.5
18mm	5.6	3
18mm	8	2.25
18mm	11	1.63
18mm	16	1.125
18mm	22	0.81
18mm	32	0.56

The smallest focal length of my second lens is 75mm:

Focal Length	Aperture Size	Aperture Dimension
75mm	4	18.75
75mm	5.6	13.39
75mm	8	9.37
75mm	11	6.81
75mm	16	4.68
75mm	22	3.41
75mm	32	2.34

  

2. If f4 on a 50mm lens has an aperture diameter of 12.5mm, what would the diameter of f4 on a 400mm lens be?

400 = 100mm

   4

Therefore the diameter of a 400mm lens with 4f-stop would be 100mm.

3. Identify where your depth of field preview button is located-

The Depth of Field preview button on my Canon 550D is located just below the button used to release lenses. This Button enables you to have a preview of the depth of field.   

4. Research the term ‘Hyperfocal Distance’ and describe how you would use it-

Hyperfocal Distance is the distance at which photos can be brought into focus, it maximises your depth of field. If you focus a camera at the Hyperfocal distance everything from the foreground to infinity will be sharp and in focus, which is why landscape photographers commonly use Hyperfocal focusing. 

You would use hyperfocal focusing if you had a rock in the foreground that you wanted to focus on and you also had for example the ocean in the background that you wanted to also be in focus. Using Hyperfocal focusing enables you to have an overall sharper image, which is ideal for printing.  

Examples

This photo was taken with normal infinity focusing. As you can see the ice in the front right hand corner is blurred.    

This photo was taken with Hyperfocal focusing, as you can see the ice in the front right hand corner is not blurred and instead it is sharp and in focus. 

About My Camera

My Camera

Canon EOS DSLR 550D

The highest ISO setting is 6400 and the lowest is 100

ISO stands for International Organisation for Standardisation

The slowest shutter speed that my camera has is the BULB setting and the fastest shutter speed that is has is 1/4000

The sensor size is 18MP

& the sensor size is 22.3x14, full frame is an advantage  because without full frame the image overlaps the sensor and as a result some of the photo is cut off.

My two lens focal length is 18-55mm and 75-300mm
& they both have a minimum aperture of 4 and the 18-55mm highest exposure is 25 and the 75-300mm highest aperture is 32.

To Change and adjust the aperture you press the av button and turn the dial to adjust the f stop.

 The two main file formats on my camera is RAW and JPEG, in the JPEG section you can choose between high, medium and low quality.

The Flash synchronisation is between 1/200 and 30seconds

My exposure compensation control can be used by pressing the av button and turning the dial.

The exposure modes on my camera can be classified into image zone and creative zone.

There is also Movie- which enables recording of digital movies. There is also Creative Auto- which gives the viewer control over focus, exposure and colour.

Image Zone:

Full Auto-Completely auto photography where the camera chooses all the settings for the shot

Portrait- softy focused background

Landscape- it keeps both near and objects in focus

Close up- produces softy focused backgrounds

Sports- fast shutter speed to capture objects

No flash- same as auto but without flash

Night portrait-combines flash with slow shutter speed to produce softer light and a brighter back ground.

Creative Zone:

Program AE- camera sets the shutter speed and aperture

Shutter priority- camera sets the shutter speed

Aperture priority- camera selects the correct aperture

Auto Depth of Field- camera selects f-stop needed to keep all subjects in focus.

Manual-  user has full creative control over all the settings.