Photography & Digital Design DVD 2 start to 19:20 10/2012 Jump Start Your Photos #2 Get the Picture / Camera Functions / Lenses The Three Planes of Focus Foreground Park Bench Shoulder Nose Middle Ground Background Car Face Cheeks Row of Cars Background Ear “Normal Lens” Sees what you would see with the “naked eye” Viewing Angle = Same as the naked eye Depth Perception = Same as the naked eye “Wide Angle Lens” Viewing Angle = Depth Perception = Wider angle than a normal lens Exaggerated Distances The Three Planes of Focus are Farther Apart Some distortion: Close items appear larger Distant items appear much smaller Viewing Angle = Narrower angle than a normal lens the stronger the lens, the narrower the angle Compresses the Three Planes of Focus The Three Planes are condensed and closer together “It isolates the subject” also called a “short lens” “Telephoto Lens” also called a “long lens” Depth Perception = “Zoom Lens” A “variable focal length lens” (as opposed to a “prime lens”) could be just wide angle (18-35mm) , or wide angle + normal (28-55mm) or normal + tele (50-150mm) or could be all three, wide + normal + tele (28-105mm) or could be just telephoto (80-250mm) (all above mm sizes assume full frame DSLR or 35mm film camera) Photographing Portraits… Wide Angle Lenses = usually never used, very distorting and unflattering Normal Lenses = Portraits still look unflattering Telephoto Lenses = best choice, most pleasing. Manny recommends 85-105 mm (full frame sensor) Jump Start Your Photo -- Lenses (con’t.) Dissecting the Lens What is a Lens ? A group of optically ground glass that collects the light at one end and focuses the light at the other end. Focal Point is on the Focal Plane (film or sensor) Why multiple pieces of glass? All colors of light focus differently. Set lens on infinity, The distance from the “optical center” to the point of focus (in mm) = Focal Length of the lens The numbers below are for a 35 mm film camera or a “full frame” digital sensor. Normal Lenses 50mm Wide Angle (or short) Lenses 35mm or smaller Telephoto (or long) Lenses 70mm or longer Going beyond the DVD….. Our Canon DSLR cameras use an APS-size sensor. That is smaller than “full frame.” The “Factor” to convert is 1.6 to 1 That means if you take the size of the Canon DSLR lens and multiply it by 1.6, you will get the “full frame” equivalent. Likewise if you take the size lens you want based upon “full frame” numbers, you would divide that number by 1.6 to get the lens size you would need for the Canon DSLR. So for our Canon Digital Single Lens Reflex Cameras a Normal lens would be 50/1.6 = 31.25 or about a 30mm. A Wide Angle Lens would be 35/1.6 = 21.875 or about 22 mm. Most people view the 24 mm and below as a wide angle lens A Telephoto lens would be 70/1.6 = 43.75 or about 44mm or longer. We have some 50mm “prime lenses” for our portrait use.