User`s guide

26
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>>ĞĊĕĎĊĈĊėĔďĊĈęĎĔē

angular sizes, primarily the Moon and planets. Planets, although
physically quite large, appear small in angular size because of their
ǤƤǡǡ
to make the image large enough to see any detail. Unfortunately,
the camera/telescope combination alone does not provide enough
ƤƤǤ
image large enough, you must attach your camera to the telescope with
ǤǡǢ
Ǧȋ͗͛͛͜͡͞Ȍǡ
T-ring for your particular camera make (i.e., Minolta, Nikon, Pentax, etc.).
ƤǡƤ
ƥƤǤ
ǡƤǤ
ǯƤ
ƤǯǤ
͠ǧ͛
ĈĈĊĘĘĔėĎĊĘċĔėėĔďĊĈęĎĔē
čĔęĔČėĆĕčĞ
ƤǤ
ȂȂ
vibration to smear the image. To get around this, use the camera’s self-
Ȃ
Ǥǡ
“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
Ǥ
the shutter has been released and the vibration has diminished (a few
ȌǡƤǤ
the exposure is complete, place the card over the front of the telescope
ǤƤǯ
Ǥ
ǡǤ
ǢǤ
Here’s the process for making the exposure.
͙Ǥ ƤǤ
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.
͞Ǥ 
of the exposure (see accompanying table).
͟Ǥ Ǥ
8. Close the camera’s shutter.
ƤǤǯ
to take photos of varying duration and keep accurate records of what you
have done. Record the date, telescope, exposure duration, eyepiece,
ȀǡƤǤ
͙͘
eyepiece. All exposure times are listed in seconds or fractions of
a second.
͠ǧ͜
ĊĈĔĒĒĊēĉĊĉĊĝĕĔĘĚėĊęĎĒĊċĔėĕčĔęĔČėĆĕčĎēČĕđĆēĊęĘǤ
Planet ISO 50 ISO 100 ISO 200 ISO 400
Moon 4 2 1 1/2
Mercury 16 8 4 2
Venus 1/2 1/4 1/8 1/15
Mars 16 8 4 2
Jupiter 8 4 2 1
Saturn 16 8 4 2
The exposure times listed here 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
Ǥ
͛͞Ǥ
NOTE: Don’t expect to record more detail than you can see
visually in the eyepiece at the time you are photographing.
ǡơƤǡ
ơơƤǤ
>>ĔēČĝĕĔĘĚėĊėĎĒĊĔĈĚĘčĔęĔČėĆĕčĞ
This is the last form of celestial photography to be attempted after
Ǥ
ǡ
ǤƤ
ǡǤ
ƤƤ
Ǥǡǡ
ǡǡƥǤ
There are several techniques for this type of photography, and the
one chosen will determine the standard accessories needed. The best
ơǦ
guider. This device allows you to photograph and guide through the
Ǥơ
ơǦǡȋ͙͗͜͟͡͞ȌǤǡ
need a T-Ring to attach your camera to the Radial Guider.
Ǥ
forms of astrophotography which allows for fairly loose guiding, prime
focus requires meticulous guiding for long periods. To accomplish this
you need a guiding ocular with an illuminated reticle to monitor your
Ǥǡơ
ȋ͙͙͗͜͟͡ȌǤǤ
1. Polar align the telescope using an optional equatorial wedge. To polar
ȋȌ
Ǥǡ
see the Polar Alignment section earlier in the manual.
2. Remove all visual accessories.
3. Thread the Radial Guider onto your telescope.
4. Thread the T-Ring onto the Radial Guider.
T-Ring
Tele-Extender
Eyepiece
Visual Back
35 mm SLR