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attach a Neutral Density filter to reduce the over all
light passage.
Camera without ttl system
When using a camera without a TTL system and fil-
ters, except for the normal filter, the exposure must
be stepped down as indicated in the belowtable to
the shutter speed indicated by an exposure meter
reading i.e. with the 300mm f5.6 reflex lens, the
setting would be f5.6. lf a Y52 filter under daylight
conditions is used, the stop-down would be 1. That
is, if the appropriate shutter speed is metered as
1/1000 seconds using a single exposure meter with
a f stop of 5.6,then. The shutter speed setting must
be 1/500 seconds.
NOTE: If a1 /2 shutter speed adjustment is indicated,
generally to negative film, a full one stop should be
taken. When a reversal film is being used, disregard the
half-stop setting and use a normal shutter speed.
Depth of field
The area of acceptable sharpness in front of. and
behind, the subject in focus is called the depth of-
field. The aperture selected and the distance of the
subject, as well as, the focal length of a lens deter-
mines such depth offield.
Because of the longer focal length of your reflex lens
the depth of field is acutely narrow, for example.
with a 800mm f8.0 lens. at a distance of 6 feet, the
depth of field is only 1 /2 inch wide.
Therefore, it is recommended tofirst practice fo-
cusing with yourlens before taking any serious
pictures, especially in close up photography. It is
suggested that afocus magnifier be used to help
determinethe depth of field sharpness under such
extreme conditions.
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