Orion ATLAS 10 EQ 9874 - Manual (Page 17)

17
Start by choosing bright objects to view. The brightness of
an object is measured by its visual magnitude; the brighter
an object, the lower its magnitude. Choose an object with a
visual magnitude of 9 or lower. Many beginners start with the
Messier objects, which represent some of the best and bright‑
est deep‑sky objects, first catalogued about 200 years ago by
the French astronomer Charles Messier.
Determine in which constellation the object lies. Now, find the
constellation in the sky. If you do not recognize the constella‑
tions on sight, consult a planisphere. The planisphere gives
an all‑sky view and shows which constellations are visible on
a given night at a given time.
Now, look at your star chart and find the brightest star in the
constellation that is near the object you are trying to find.
Using the finder scope, point the telescope at this star and
center it on the crosshairs. Next, look again at the star chart
and find another suitably bright star near the bright star cur‑
rently centered in the finder. Keep in mind that the field of
view of the finder scope is approximately 5°, so you should
choose another star that is no more that 5° from the first star,
if possible. Move the telescope slightly, until the telescope is
centered on the new star.
Continue using stars as guideposts in this way until you are
at the approximate position of the object you are trying to find
(Figure 21). Look in the telescope’s eyepiece, and the object
should be somewhere within the field of view. If it’s not, sweep
the telescope carefully around the immediate vicinity until the
object is found.
If you have trouble finding the object, start the starhop again
from the brightest star near the object you wish to view. This
time, be sure the stars indicated on the star chart are in fact
the stars you are centering in the eyepiece. Remember, the
finder scope (and main telescope eyepiece, for that matter)
gives an inverted image, so you must keep this in mind when
starhopping from star to star.
9. astrophotography
When coupled to a 35mm single‑lens reflex camera, the Atlas
10 EQ becomes a telephoto lens. To attach a camera, you
need only a T‑ring for your specific camera model and the
included camera adapter. First you must attach the includ‑
ed camera adapter to the Atlas 10 EQ’s focuser. To do this,
remove the 1.25" and 2" eyepiece adapters from the focuser
drawtube (Figure 22a). Then screw the camera adapter into
the focuser drawtube (Figure 22b). Now attach the T‑Ring to
your camera and thread it onto the camera adapter (Figure
22c).
Use the camera’s viewfinder to frame the picture. Use the
telescope’s focuser to focus the image. You may want to con‑
sider using a remote shutter release instead of the shutter
release on the camera; touching the camera can vibrate the
system and blur the resulting photographic image on the film.
Use the focus lock knob on the focuser to fix the focus when
the image is sharp.
Several different types of astrophotography can be success‑
fully attempted with the Atlas 10 EQ.
Moon Photography
This is perhaps the simplest form of astrophotography. Point
the telescope toward the Moon, and center it within the cam‑
era’s viewfinder. Focus the image with the telescope’s focuser.
Try several exposure times, all less than 1 second, depending
on the phase of the moon and the ISO (film speed) of the film
being used. A remote shutter release is recommended, as
touching the camera’s shutter release can vibrate the camera
enough to ruin the exposure.
Planetary Photography
Once basic Moon photography has been mastered, it’s time to
get images of the planets. This type of astrophotography also
works to get highly magnified shots of the Moon. In addition
to the T‑ring, you will need a Universal 1.25" Camera Adapter.
The equatorial mount must be accurately polar aligned, too.
As before, connect the T‑ring to your camera. Before connect‑
ing the universal camera adapter to the T‑ring, an eyepiece
must be inserted and locked into the body of the universal
camera adapter. Start by using a medium‑low power eye‑
piece (about 25mm); you can increase the magnification later
with a high‑power eyepiece. Then connect the entire camera
adapter, with eyepiece inside, to the T‑Ring. Insert the whole
system into the focuser’s 1.25" adapter and secure firmly with
the thumbscrew.
Aim the telescope at the planet (or Moon) you wish to shoot.
The image will be highly magnified, so you may need to use
Figure 22a. First remove both the 1.25"
and 2" adapters as shown.
Figure 22c. The SkyView Pro 8 EQ with
35mm SLR camera attached.
Figure 22b. Thread the camera adapter
into the focuser drawtube.