Introduction to Photography

Introduction to Photography

• Lens aperture is a measure of the diaphragm opening's diameter relative to the lens focal length, expressed as an f-number (e.g., f/2.8).
• A lower f-number (e.g., f/2.8) indicates a wider opening, allowing more light.
• A higher f-number (e.g., f/16) indicates a narrower opening, allowing less light.
• Depth of field (DOF) is the distance between the nearest and farthest objects in a scene that appear acceptably sharp.
• A wide aperture (small f-number) results in a shallow depth of field.
• A narrow aperture (large f-number) results in a large depth of field.

Aperture

• Aperture is a device that controls the amount of light entering a camera to expose the image sensor.
• Aperture controls the image's clarity or focus on the subject.
• Common aperture speeds range from 1 to 1000.

Exposure

• Exposure is the product of time and intensity of light.
• Exposure can be adjusted by aperture speed and lens aperture.
• Two types of light meters exist: incident and reflected.

Shooting Situations

• Various shooting situations (sports, portrait, night, landscape, macro) dictate appropriate camera settings.

Photographic Film

• Photographic film is a sheet of plastic coated with emulsion containing light-sensitive silver halide salts.
• When exposed to light, the emulsion forms a latent image.
• The image is then developed chemically to produce a visible image in black and white photography.

Image Sensor

• Image sensors convert an optical image into an electronic signal.
• Charge-coupled devices (CCDs) and complementary metal-oxide semiconductors (CMOS) are the most common types of sensors.
• Sensors consist of tiny light-sensitive diodes (photodiodes).

Color Capture

• Trilinear image sensors capture color information using three linear arrays.
• Arrays are sensitive to red, green, and blue.
• As the image moves across the sensor, each line captures its respective color component.
• Digital cameras often use beam splitters and color filters to divide light into separate color components.

Resolution

• Resolution is the number of pixels captured by the image sensor.
• Higher resolution generally means a higher quality image.

Composition

• Composition is the arrangement of elements in an artwork or image to create a balanced and aesthetically pleasing effect.
• Principles like balance, proportion, rhythm, and rule of thirds help create effective compositions.

This quiz covers the fundamental concepts of photography, focusing on lens aperture and exposure. Learn how aperture settings and depth of field influence the clarity and lighting of your images. Ideal for beginners looking to enhance their photography skills.