![Telescope Focal Length (mm)](/images/new-backgrounds/102016/1020167x1.webp)
divide the focal length of the telescope by the focal length of the eyepiece:
1.25" nosepiece
Telescope Focal Length (mm)
Eyepiece Focal Length (mm)
= Magnification
For example, the 6" Newtonian Imaging Reflector, which has a focal length of 750mm, used in combination with a 25mm eyepiece, yields a magnification of
750 mm | = 30x |
25 mm |
|
Every telescope has a useful limit of power of about
Always start viewing with your
Astroimaging with the 6" Newtonian
Imaging Reflector
The 6" Newtonian Imaging Reflector has been specifically designed for use with astronomical CCD imaging cameras like the Orion StarShoot, but other imaging systems such as digital SLR cameras will also work well with the telescope. The secondary mirror of the 6" Newtonian Imaging Reflector has been sized appropriately to provide a fully illuminated field of view for Orion StarShoot cameras and most popular digital SLR models.
Unlike most Newtonian reflector designs, the 6" Imaging Reflector's secondary mirror has been recessed further into the tube to prevent
To use your CCD camera with the 6" Newtonian Imaging Reflector, the camera must have a 1.25 inch “nosepiece”. Otherwise an external camera adapter with
If your camera does not include a 1.25" nosepiece, you have a digital SLR, or if you wish to utilize a secure
Figure 2. To use a CCD camera with the 6" Imaging OTA, the camera must have a 1.25” nosepiece, like the Orion StarShoot Imaging cameras, or else an external camera adapter with T‑threads is required.
To attach a digital SLR to the telescope, remove any attached lenses and connect a
Due to its
To record an image of a
Collimating the Optics
Collimating is the process of adjusting the mirrors so they are aligned with one another.Your telescope’s optics were aligned at the factory, and should not need much adjustment unless the telescope is handled roughly. Accurate mirror alignment is important to ensure peak performance of your telescope, so it should be checked regularly. Collimating is relatively easy to do and can be done in daylight.
To check optical alignment, remove the eyepiece and look down the focuser drawtube. You should see the secondary mirror centered in the drawtube, as well as the reflection of the primary mirror centered in the secondary mirror, and the reflection of the secondary mirror (and your eye) centered in the reflection of the primary mirror, as in Figure 3a. If anything is
The Collimating Cap and Primary Mirror Center Mark
Your 6" Newtonian Imaging Reflector comes with a collimat ing cap. This is a simple cap that fits on the focuser drawtube like a dust cap, but has a hole in the center and a silver bot
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