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6. Exposure or Aperture Adjustments with TTL Cameras
Since the aperture of the re ex lens cannot be changed, the exposure is controlled entirely by the
shutter speed being used. The speed dial is set according to your TTL reading. Cameras with
automatic aperture and shutter priority will automatically set the right speed with their auto
exposure mechanisms, with the exception of a few models which require manual function.
With aperture priority or manual operation of your camera, the apropriate shutter speed must be
adjusted using three neutral density lters in case of over exposure readings or if the camera's
LED warning light is activated. If your camera has a manual TTL system, then simply follow the exposure
indicator in the view nder by compensating with the shutter speed. If there is excessive light beyond the
shutter speed capability, then attach a Neutral Density lter to reduce the overall passage of light.
7. Exposure or Aperture Adjustments on Cameras Without a TTL System
When using a camera with no TTL system and only a normal lter, the exposure must be stopped
down as indicated by the table on the following page to the shutter speed adusted as indicated
by an exposure meter reading. So, for example, with a 300mm f5.6 re ex lens, the setting would
be f5.6. If a Y52 lter is used in daylight, the stop down would be 1. Also, if the appropriate
shutter speed is metered as 1/1000 seconds using a single exposure meter with an f stop of 5.6,
then the shutter speed setting would be 1/500 seconds.
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