
TIPS How to select ND lters
If you normally use two or three lenses, we recommend getting 1/4, 1/8 and 1/16 round, glass screw-in type ND lters that match
the diameter of your largest-diameter lens. Or it could be a fader-type ND lter that matches the diameter of your largest-diameter
lens. When you use a smaller lens, you can attach your lter to a step-up ring.
If you use many lenses and they include a large-diameter lens, selecting the combination of a matte box and square glass ND lters
will give you more exibility.
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0 AUTOMATED FUNCTIONS 1 SENSOR AND LENS 3 FILE BASED
2 SHOOTING STYLES 4
PICTURE PROFILE
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■Round, glass screw-in type
These lters are designed to be screwed in at the tip of the lens
unit. Cheap and widely available, these lters can reduce the light
volume to 1/4, 1/8, or 1/16 of the original level.
Because they need to match the lens unit’s lter diameter
requirement, you need to obtain lters that are in the right size or
alter the lter diameter by using a tool such as a step-up ring.
If the light volume is still too high even with a 1/16 lter,
you will need to combine multiple lters. In such instances,
diffused reections can easily cause ares and halation. To
prevent them, you need to block the light from directly hitting
the lters.
■Square glass type
These are high-priced lters that are used in combination with a
matte box. They are not affected by the lens diameter, and the
light volume can be adjusted by simply changing one lter with
another.
■Sheet type
Because these lers were at rst based on gelatin, they are still
widely referred to as gelatin lters.
They are inserted into a paper lter-holder. Sometimes, they are
cut up into smaller pieces and attached to the back of the lens or
the lens mount. You need to be careful with dust and make sure
that pieces of the sheet-type
lter do not touch the sensor
section. For these reasons, we
do not recommend the second
usage method.
■Filters that enable ND level to be controlled
via fader lever
These recently introduced products are round, glass screw-
in type lters with a lever on their outer circumference. By
turning the lever, you can change the light volume.
These lters alter colors more than other types of ND lters.
You need to take precautions, such as checking white
balance manually for every cut.
When using a wide aperture in a bright outdoor setting, for instance to achieve a shallow depth of eld effect, a high shutter speed is
required in order to prevent overexposure. Where a shutter speed of 1/48 sec would be suitable in 24 p mode, at a larger aperture a
very fast shutter speed of around 1/1000 sec would be needed, making movements appear brittle and unnatural. An alternative is
to t an external ND lter to the lens to reduce the amount of light entering the camera.
External ND lter