Lenses
The amount of light that passes through the lens is controlled by the aperture. Compared to most compact cameras, digital SLRs use interchangeable lenses. They are selected on the basis of specific conditions, or during shooting to suit the requirements of the photographer.
Lenses are classified by type, focal length and specialization.
Division of lenses by type
Fixed focus lenses
- Fixed focal length
- High-quality optical properties
- Substitution of the lens according to specific conditions
Zoom lenses
- Variable focal length
- Ability to focus on subjects from a distance
- Slightly impaired quality compared with fixed focus lens
Dividing by the focal length of the lens
Basic lenses
- Viewing angle close to the angle of the human eye
- The most commonly used lens is 50 mm
- The most natural images often used in portraits
Wide-angle lenses
- Have focal lengths up to 24 mm
- Large viewing angle and image width
- Greater depth of field, focuses on more of the scene
Telephoto lenses
- Use a very small viewing angle
- Ability to shoot very distant objects
- Have focal lengths from 135 mm
- Very shallow depth of field separating the subject from the background
- Slight suppression of perspective
- Perfect for sports and wildlife photography
Specialist lenses
Fish eye
- Ultra wide lens designed to shoot a scene in the visual angle of 180 degrees or more
Macro lenses
- Allows you to shoot objects at actual size
- Focusing on a very small distance
- Prefect for shooting insects, flowers etc. in fine and close detail
