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Celestron C4.5 User Manual

Celestron C4.5
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Eyepiece
Projection
This
form
of
celestial
photography
is
designed
for
objects
with
small
angular
sizes,
primarily
the
planets
and
individual
lunar
features.
Planets,
although
physically
quite
large,
appear
small
in
angular
size
because
of
their
great
distances.
Moderate
to
high
magnification
is,
therefore,
required
to
make
the
image
large
enough
to
see
any
detail.
Unfortunately,
the
camera/telescope
combination
alone
does
not
provide
enough
magnification
to
produce
a
usable
image
size
on
film.
In
order
to
get
the
image
large
enough,
you
must
attach
your
camera
to
the
telescope
with
the
eyepiece
in
place.
To
do
so,
you
need
two
additional
accessories;
a
tele-extender
(#93647),
which
attaches
onto
the
visual
back,
and
a
T-ring
for
your
particular
camera
make
(i.e.,
Minolta,
Nikon,
Pentax,
etc.).
Because
of
the
high
magnifications
during
eyepiece
projection,
the
field
of
view
is
quite
small
which
makes
it
difficult
to
find
and
center
objects.
To
make
the
job
a
little
easier,
align
the
finder
as
accurately
as
possible.
This
allows
you
to
get
the
object
in
the
field
based
on
the
finder’s
view
alone.
Another
problem
introduced
by
the
high
magnification
is
vibration.
Simply
tripping
the
shutter
even
with
a
cable
release
produces
enough
vibra-
tion
to
smear
the
image.
To
get
around
this,
use
the
camera’s
self-timer
if
the
exposure
time
is
less
than
one
second
a
common
occurrence
when
photo-
graphing
the
Moon.
For
exposures
over
one
second,
use
the
“hat
trick.”
This
technique
incorporates
a
hand-held
black
card
placed
over
the
aperture
of
the
telescope
to
act
as
a
shutter.
The
card
prevents
light
from
entering
the
telescope
while
the
shutter
is
released.
Once
the
shutter
has
been
released
and
the
vibration
has
diminished
(a
few
seconds),
move
the
black
card
out
of
the
way
to
expose
the
film.
After
the
exposure
is
complete,
place
the
card
over
the
front
of
the
telescope
and
close
the
shutter.
Advance
the
film
and
you're
ready
for
your
next
shot.
Keep
in
mind
that
the
card
should
be
held
a
few
inches
in
front
of
the
telescope,
and
not
touching
it.
It
is
easier
if
you
use
two
people
for
this
process;
one
to
release
the
camera
shutter
and
one
to
hold
the
card.
Here’s
the
process
for
making
the
exposure.
1.
Find
and
center
the
desired
target
in
the
view
finder
of
your
camera.
2.
Turn
the
focus
knob
until
the
image
is
as
sharp
as
possible.
3.
Place
the
black
card
over
the
front
of
the
telescope.
4.
Release
the
shutter
using
a
cable
release.
5.
Wait
for
the
vibration
caused
by
releasing
the
shutter
to
diminish.
Also,
wait
for
a
moment
of
good
seeing.
6.
Remove
the
black
card
from
in
front
of
the
telescope
for
the
duration
of
the
exposure
(see
table
7-2).
7.
Replace
the
black
card
over
the
front
of
the
telescope.
8.
Close
the
camera’s
shutter.
Advance
the
film
and
you
are
ready
for
your
next
exposure.
Don’t
forget
to
take
photos
of
varying
duration
and
keep
accurate
records
of
what
you
have
done.
Record
the
date,
telescope,
exposure
duration,
eyepiece,
f/ratio,
film,
and
some
comments
on
the
seeing
conditions.
Celestial
Photography
+
43

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Celestron C4.5 Specifications

General IconGeneral
BrandCelestron
ModelC4.5
CategoryTelescope
LanguageEnglish

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