Celestron 93669 Mode D'emploi

Nebula Filter
for Origin
#93669
PARTS LIST
Nebula Filter
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Spectral Transmission Graph
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Plastic Case
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The Nebula Filter for Origin allows you to take spectacular images of nebulae
from heavily light polluted locations. This filter transmits the key emission
wavelengths at 656nm (H-α), 486nm (H-β), and 496nm/ 501nm (OIII)
while blocking all other wavelengths of light. The filter blocks the "bad" light
from light pollution, allowing only the "good" light from nebulae to pass through.
You'll notice the most dramatic improvement under light polluted skies, but
you'll also see some improvement in contrast under dark skies, as the filter also
blocks natural skyglow.
We don't recommend using the Nebula Filter for imaging broadband emission
objects such as stars, star clusters, and galaxies. These objects emit light at
a range of wavelengths throughout the visual spectrum. The Nebula Filter will
block too much light to be useful in most situations.
Origin's fast f/2.2 optical system means that light rays approach the focal plane
at steeper angles than they do with other telescope designs. We designed
the Nebula Filter for Origin with this in mind. Unlike other filters with narrower
FWHM bandwidths, this filter achieves maximum light transmission at the
desired wavelengths.
Celestron Quality Assurance carefully tested this filter at the factory to measure
its spectral transmission. You'll find the test results for your specific filter
included in this package.
INSTALLING THE FILTER IN ORIGIN
The Nebula Filter replaces the clear filter that is pre-installed in Origin's filter
drawer. Replacing one filter with another that has the same thickness maintains
optical performance, as no extra glass is introduced into Origin's fast (f/2.2)
optical system.
WARNING: When removing and installing filters, avoid touching optical surfaces
or you may leave fingerprints. Handle the filters by their cells only.
1. Remove Origin's lens shade to access the filter drawer. If you are unsure how
to do this, consult the Origin instruction manual.
2. Remove the filter drawer from Origin by grasping the drawer's handle and
gently pulling it until it releases from the magnets that secure it in place.
Origin's clear filter will be installed in the drawer.
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