Workshop 3: Workshop 4: Choosing the right lens for you

Testing Lenses Lecture Notes:

Focal Length
• Focal length will determine the amount off the scene that is recorded
• 15mm fisheye 180° field off view
• 20mm 94°
• 28mm 75°
• 35mm 63°
• 50mm 46°
• 85mm 28° 30’’
• 135mm 18°
• 200mm 12°
• 300mm 8° 15’’
• 400mm 6° 10’’
• 600mm 4° 10’’
• 1200mm 2° 5’’
http://www.usa.canon.com/app/html/EFLenses101/focal_length.html

•A Zoom lens is better for a portrait as you can be further away from your subject, but still be able to fill the frame.
•Prime lenses and wide angle lenses are whats needed for interiors. 28mm or wider is often nessercery.
•Wide angle and tilt shift lenses are perfect for architecture. A prime lens will allow you to keep lines straight, a tilt shift will help fix the converging lines and help with focus.
•What is the correlation between dof and focal length?
• Lens choice will enable you to change perspective, a lens can compress a scene, it can also convey a
feeling off space and openness

Lenses tested: 50mm 1.8 and the 24- 70mm 2.8

In my test for the lens 24-70mm L2.8 I discovered that the sharpest point is from between about f4 - f11, after and before this the focus is not good at all.

To test the focus I shot at 51mm focal length. When my camera is set to Av mode the shutter speed is alot faster then what it ought to be according to a light meter reading at 2.8 the light meter said we needed 320 but the in camera meter made it 800s, which is really strange and shows you how off the in camera metering can be.