DayStar Filters Combo Quark Hydrogen Alpha Eyepiece Руководство - Страница 8
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powered, high resolution telescopes and DayStar filters should heed
daytime seeing. While many of these conditions are beyond our control,
observing in an area with ideal conditions, without pavement in the
direction of viewing, and on days with no high cirrus will offer best
results. Grass is the best environment for daytime seeing stability.
Each observing location offers different behavior for daytime seeing cells
at different times of the day, as the air through which one views changes
with movement of the sun. Some locations benefit from best seeing in
the morning, while many have best seeing in the afternoon. Because
most heat variation between air and ground surfaces occurs within the
first 10 feet above the ground, often a high observing platform will offer
superior seeing. This might include a second story deck which overlooks
grass.
Solar Imaging Tips:
Daystar recommends
MONOCHROME CCD
imaging whenever
possible for best results.
The recent availability of
CCD cameras and DSLR
cameras has offered a
simple opportunity for
solar observers to image
the Sun in Hydrogen
Alpha with a Digital SLR camera. Please be 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.