DayStar Filters Combo Quark Hydrogen Alpha Eyepiece Podręcznik - Strona 4
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ENERGY REJECTION:
Energy Rejection Filters reduce the heat load on your filter assembly by
absorbing or reflecting UV and/or IR light and transmitting light in the
visual spectrum. These filters are Red, Yellow, or clear glass with an IR
and UV reflective coating. The ERF can also serve as an aperture mask
to accomplish a straight angle of incidence for light entering the filter.
Please note, a Herschel Wedge or white light filter cannot be used with
the Quark. Those filters block 99.999% of all light, including the desired
H alpha light.
REFRACTORS:
For brief observing sessions using refractors with less than 80mm of
aperture when not using a tracking mount. Be alert for any rise in
temperature of your telescope, diagonal, or Quark.
For telescopes under approximately 150mm of
aperture, a screw in UV/IR cut filter can be
employed in front of the telescope diagonal.
The UV/IR cut filter reflects UV and IR light
back out the front of the telescope, reducing
temperatures inside. Do not use a UV/IR cut
filter with a telescope with an integrated rear
field flattener or Petzval lens. The UV/IR cut filter must be the first optical
element to encounter concentrated light.
For highest safety, a red or yellow
glass
front
mount
Energy
Rejection Filter should be used.
This prevents almost all heat from
entering the telescope. Please
measure the outside diameter of
the front of your telescope's dew
shield.
This
tube
OD
measurement
is
critical
to
ensuring a good fit for your ERF.
MAKSUTOV TELESCOPES:
Maksutov telescopes usually use a full aperture colored glass ERF.