Filter - PR FOTO AS

HELIOPAN UV filter
The UV or Haze filter is not only an excellent filter for visually improving images
on both digital and film but it can always stay on the lens to protect it
from fingerprints, dust, moisture, etc. It absorbs the short wave portion of the
spectrum so in hazy conditions a better image of the scene is possible. Loss
of sharpness from UV Rays and the blue tones common in infinity scenes are
eliminated. No exposure correction is needed. Available in both standard and
SH-PMC coatings.

HELIOPAN Protection Filter
The Heliopan Protection Filter is optimally ground from special raw glass and
coated with Heliopan's SH-PMC 16 layer multi-coating to protect the lens
while adding no color whatsoever. This protects the lens, and to avoid expensive
repairs to lenses, especially as many digicams have a non-removable
built-in zoom lens.

HELIOPAN KR 1.5 Skylight (1A) Filter
This light salmon colored skylight filter reduces the bluish cast in scenic
shots, in snow scenes or of normal objects around noon time it adds a pleasant
warmth and soft color character with digital cameras whose sunlight
white balance can be too cool it absorbs UV Rays and serves as a protection
filter as no exposure correction is necessary. It is available in standard and
SH-PMC coatings.

HELIOPAN Polarizing Filters
Polarizing Filters reduce reflections and glare, they are a neutral color and can
be used for color or black and white imaging.
As the light coming from the sun is not polarized parts of the light become
partially polarized due to the scattering of particles in the atmosphere. This
scattering reduces the transparency of the air and creates haze in the distance
and the blue in the sky on a sunny day. Polarization also controls in the reflections
of light on the original color of the surface. The Heliopan Polarizer improves the
color of the sky, (in distant pictures, mountain scenes, etc.) it reduces the bluish
cast in landscapes and increases the blue color of the sky. The effect is strongest
at a 90° angle to the sun. In addition polarizers enhance the color saturation of the
scene by suppressing the reflections on the surface, undesired reflections are
largely eliminated. While increasing color saturation with software can also improve
the color saturation the faded parts of the leaves in the illustration above will increase
as well. This procedure will not replace the need for a polarizer. For digicams
we recommend using a circular polarizer, linear polarizers may result in incorrect
exposure or focus under some lighting conditions. They are available
with or without SH-PMC coating and in slim or standard rims. The rims are
calibrated to help in finding the proper settings when a TTL preview is not
available.
 

Heliopan ND filter (gråfilter)
Neutral Density filters are important tools for controlling light reduction. They
permit less depth of field under bright lighting since the aperture has to be
larger and, in addition, they permit long time exposures with stronger ND filters
in sunlight.
With digital imaging over exposure can be avoided resulting in natural color
reproduction. ND gray filters are manufactured from color neutral Schott
glass so they can be used for color imaging. They are available in 3 densities.
Higher densities are available on special order for technical and scientific
applications.
On most digicams the imaging sensor is smaller than the 35mm format. This
results in a relatively large depth of field, even with a large aperture opening
this can be disturbing - when eg. A portrait has to be separated from the bakkground
and the available light requires the use of a smaller aperture, reducing
the available light allows the choice of the best aperture. Also with digicams
that only operate in full auto mode, the depth of field can be reduced.
Digicams frequently have fewer apertures then film cameras, (eg. 2.8 to 5.6
or 2.0 to 8.0) a neutral density filter allows a much larger choice of exposure
combinations.

Creative Tip:
For evening and night exposures, totally close the aperture, use a strong
ND filter and use a tripod. Long time exposure, will result in moving
objects disappearing and a surreal effect.
Density Light Loss Filter Factor Exposure Correction

HELIOPAN Infrared Filters
A very interesting area in digital photography is infrared images for creative
and artistic effects. Heliopan filters made from Schott glass, pass only the
exact areas of the IR Spectrum: RG695(89B), RG715(88A), RG780(87),
RG850, RG1000. For digital landscape pictures we recommend the R715 to
RG830 filters.

TIPS FOR TAKING PICTURES WITH HELIOPAN IR FILTERS:
• Subjects with a lot of sun light have the greatest IR radiation.
• Always use a Giottos Tripod because of the long exposure times.
• Compose your image before mounting the filter.
• Because of the focus shift set the distance manually to the IR index on
the lens or use the AF setting with the filter in place and do not use
open aperture. AF sensors can sometimes partially focus to IR.
Alternatively make a test with a series of adjustments manually going
from the normal sharp setting in small steps into the close-up area.
• Quite often the exposure needs a lot of increase. Use the +/- correc
tion or the manual mode for additional over exposure.
• In the black and white mode you can see the proper exposure in the
camera display. In the color mode you can see it in the histogram
display. This applies especially for the red channel.
• Use JPEG to avoid the complex signal processing in the RAW mode.