667016

Celestron Omni XLT 150 Manual

37
Zoom out
Zoom in
Previous page
1/62
Next page
37
2. Center the Moon in the field of your telescope.
3. Focus the telescope by turning the focus knob until the image is sharp.
4. Set the shutter speed to the appropriate setting (see table 6-1).
5. Trip the shutter using a cable release.
6. Advance the film and repeat the process.
Lunar Phase ISO 50 ISO 100 ISO 200 ISO 400
Crescent
1/2 1/4 1/8 1/15
Quarter
1/15 1/30 1/60 1/125
Full
1/30 1/60 1/125 1/250
The exposure times listed in table 7-1 should be used as a starting point. Always make exposures that are longer and
shorter than the recommended time. Also, take a few photos at each shutter speed. This will ensure that you will
get a good photo.
• If using black and white film, try a yellow filter to reduce the light intensity and to increase contrast.
• Keep accurate records of your exposures. This information is useful if you want to repeat your results or if
you want to submit some of your photos to various astronomy magazines for possible publication!
• This technique is also used for photographing the Sun with the proper solar filter.
E
E
y
y
e
e
p
p
i
i
e
e
c
c
e
e
P
P
r
r
o
o
j
j
e
e
c
c
t
t
i
i
o
o
n
n
f
f
o
o
r
r
a
a
S
S
c
c
h
h
m
m
i
i
d
d
t
t
-
-
C
C
a
a
s
s
s
s
e
e
g
g
r
r
a
a
i
i
n
n
This form of celestial photography is designed for objects with small angular sizes, primarily the Moon and planets.
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 deluxe tele-extender (#93643), which attaches to the visual back, and a
T-ring for your particular camera make (i.e., Canon, 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 telescope's 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 vibration 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 photographing 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.
Table 6-1
Above is a listing of recommended exposure times when photographing the Moon
at the prime focus of your telescope.
35mm SLR
T-Ring
Tele-Extender
Eyepiece
Visual Back
Figure 6-1
Accessories for Projection
Photography
… 37 …


Need help? Post your question in this forum.

Forumrules


Report abuse

Libble takes abuse of its services very seriously. We're committed to dealing with such abuse according to the laws in your country of residence. When you submit a report, we'll investigate it and take the appropriate action. We'll get back to you only if we require additional details or have more information to share.

Product:

For example, Anti-Semitic content, racist content, or material that could result in a violent physical act.

For example, a credit card number, a personal identification number, or an unlisted home address. Note that email addresses and full names are not considered private information.

Forumrules

To achieve meaningful questions, we apply the following rules:

Register

Register getting emails for Celestron Omni XLT 150 at:


You will receive an email to register for one or both of the options.


Get your user manual by e-mail

Enter your email address to receive the manual of Celestron Omni XLT 150 in the language / languages: English as an attachment in your email.

The manual is 9,2 mb in size.

 

You will receive the manual in your email within minutes. If you have not received an email, then probably have entered the wrong email address or your mailbox is too full. In addition, it may be that your ISP may have a maximum size for emails to receive.

The manual is sent by email. Check your email

If you have not received an email with the manual within fifteen minutes, it may be that you have a entered a wrong email address or that your ISP has set a maximum size to receive email that is smaller than the size of the manual.

The email address you have provided is not correct.

Please check the email address and correct it.

Your question is posted on this page

Would you like to receive an email when new answers and questions are posted? Please enter your email address.



Info