DayStar Filters Magnesium Quark Eyepiece Посібник користувача - Сторінка 8
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Друкувати сторінкуSolar Imaging Tips:
RGB Inside the Camera
Oaystar
recommends
Inaming V
isib~
MONOCHROME
CCO
ight
imaging
whenever
possible for best results.
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The recent availability of
CCD cameras and DSLR
cameras
has offered a
simple
opportunity
for
solar observers to image
CoIorb.,d
senson;
the Sun with a Digital SLR
=e~~~Ch
camera
.
Please
be
sensorlnoeleCUictly
advised,
however, that due to the nature of monochromatic light and its
effects on a CCD camera, certain negative effects are likely to occur.
The DSLR imager must be aware that most camera manufacturers
(Canon and Nikon) use an IR blocking filter which greatly reduces the
transmission of Hydrogen Alpha light. DSLR cameras without this IR
blocking filter will have better sensitivity imaging in Hydrogen Alpha
.
The imager should also appreciate that even after considering IR
blocking filters, that the COLOR CCD chip is constructed in a way that
only 1 in 4 pixels detect red light. The other 3 sensors only detect blue
and green because the pixels are actually permanently covered with a
colored dye for each corresponding color.
So a color CCD chip (in a
DSLR or a CCD camera) will only offer 1/4 the sensitivity and 1/2 the
resolution of a monochrome chip
.
•
Another effect
present in
CCD
imaging
of
monochrome
light
of
Magnesium
is
the
interference pattern - or Newton's Rings.
The
-
\
.
effect is similar to interference testing of an optical
surface between two flat
surfaces.
The sensor
'.
.
I
I .
\
;
and cover slip cause a small interferometer inside
the camera and cause a Newton's Ring moire'
pattern. The CCD chip must be tilted to a minor
degree to prevent this pattern. Recent advances
in aftermarket adapters offer a simplified solution for the
issue.
This
effect is a concern for both color and monochrome sensors.
An accessory is available from DayStar which can be used between the
DSLR and Quark to adjust the light angle and extinct the interference
pattern, is available in T (MG-040B) and C (IECC) mount versions .