-PHOTOGRAPHIC TECHNIQUES-confinued------
The procedure for bounce flash is as follows :
1) Choose the bounce surface.
Select the ceiling or wall you want to bounce the flash off of ; then tilt and/or rotate the main flash head so that it pOints in that direction. The position of the flash unit, the bounce angle, and the setting of the zoom head should be determined after considering the size and shape of the subject and the effect desired . With a subject having great depth, some light should reach the point furthest away from the camera to create a
2) Set the zoom head.
In bounce flash photography, a large amount of light is required, because the light has to travel a longer distance than in direct flash photography, and also the bounce surface absorbs a certain amount of light. Therefore , it is recommended that the zoom head be set at T. The ratio of diffused illumination (from the bounce surface) to direct illumination (from the secondary flash head) is also an important consideration. If the bounce surface is too far away or is not very reflective, the level of the diffused illumination may be almost the same as the direct illumi- nation, thus effectively cancelling the diffused lighting effect. In this case, adjust the angle of the main flash head or shorten the bounce distance so that there is more difference in illumination levels.
3) Choose an aperture.
Test firing the flash is necessary, because exposure in bounce flash photography depends on so many condi- tions, such as reflectivity of the bounce surface and the bounce distance. Note that, in bounce flash , shooting distance cannot be read with the exposure calculator dial.
4) Bracket your exposures_
It is recommended that you take additional shots, with the camera 's exposure compensation dial set in the + direction for TTL au tomatic shooting or with the lens opened up one or two f/stops in the regular
Notes:
1)In general, there is a two or three flstop loss in illumination because of the absorption of light by the reflective surface.
2)Unless the surfa ce of the reflector you are bouncing the light off of is white or silver, your color photographs will come out with an unnatural color cast similar to that of the reflecting surface.
3)When the flash head is tilted back 45° or less, some amount of light from the flash head may reach the subject directly, causing uneveness of illumination. To avoid this, make sure the head is tilted back 60° or more.
4)In bounce flash, the angle of incidence is equal to the angle of re - flection.
56