IT 1210 Flash and Macro Photography

Transcription

1 IT 1210 Flash and Macro Photography

2 Flash Flash Photography Think of your flash as a portable sun! With it you can take great images, or lousy images. In order to take great images there are two important points that you need to understand. 1. The Inverse Square Law of light. 2. The aperture and only the aperture - controls the amount of electronic flash light allowed to expose the picture.

3 The Inverse Square Law The Inverse Square Law According to the law, the power of the light will be inversely proportional to the square of the distance. So if we take a distance of 2 and square it, we get 4, the inverse of which would be 1/4 or rather, a quarter of the original power - not half. Moving our subject 3 meters from the light (3 * 3 = 9, so 1/9) the power of our light source now becomes 1/9th of what it originally was.

4 The Inverse Square Law in Action Object one foot away from the flash. Object two feet away from the flash. Object three feet away from the flash.

5 The Aperture Controls All! The Aperture All flash exposures are 100% dependent on the right aperture being selected, and the right flash to subject distance for that aperture setting. The shutter speed only controls the amount time that any ambient light is allowed to expose the same picture for which you using a flash. The synch speed is simply the fastest shutter speed you can use with your flash. The speed of the flash burst is approximately 1/1000 1/40000 of a second! Flash 100%, 2 stops Underexposed, f 3.5 Flash 100%, 1 stop Underexposed, f 3.5 Flash 100%, correct exposure, f 3.5

6 Fill Flash Fill flash is a technique used to brighten deep shadow areas, typically outdoors on sunny days, though the technique is useful any time the background is significantly brighter than the subject of the photograph, particularly in backlit subjects. To use fill flash the aperture and shutter speed are adjusted to correctly expose the background, and the flash is fired to lighten the foreground. Most point and shoot cameras include a fill flash mode that forces the flash to fire, even in bright light. Depending on the distance to the subject, using the full power of the flash may greatly overexpose the subject especially at close range Fill Flash Correct Exposure Correct Exposure with Fill Flash

7 Nikon D3200 Flash Modes Fill Flash (Front Curtain Sync) the flash fires as soon as the front curtain opens, shutter then remains open during exposure duration. Rear-curtain sync the front curtain opens completely and remains open during exposure, then the flash is fired and the curtain closes. Red-Eye Reduction there is a one-second lag after pressing the shutter before picture is taken, during which the red-eye reduction lamp lights causing the pupils to contract. Slow sync Used in Aperture and Program modes, will slow shutter speeds by as much as 30 seconds, allowing ambient light to fill image.

8 Nikon D3200 Flash Modes Front curtain sync/fill flash Rear curtain sync

9 Nikon D3200 Flash Modes and Guide

10 Macro Photography Macro Photography We could spend an entire semester on macro photography. So, just the bare minimum for now, at least! Macro photography is extreme close-up photography, in which the subject in the resulting picture is greater than life size. Essentially in macro mode, or when using a macro lens the image is photographed at a 1:1 ratio. When the image is blown-up to picture size it appears to be magnified. Using macro photography may open up a new world of photographic ideas and techniques! Photomacrograph of a common yellow dung fly (Scathophaga stercoraria) made using a lens at its maximum 1:1 reproduction ratio, and a 18 24mm image sensor, the on-screen display of the photograph results in a greater than life-size image.

11 Nikon D3200 Macro Mode

12 Macro Examples Latte

13 Food Coloring and a bowl of water Macro Examples

14 Macro Insects and Flowers

15 Macro Insects and Flowers

16 Macro Insects and Flowers

17 Macro Insects and Flowers

18 Macro Insects and Flowers

19 Macro Insects and Flowers

20 Macro Insects and Flowers