Vixen Eyepiece Instruction Manual

Eyepiece Projection Camera Adapter ! ! ! ! ! ! ! ! ! ! ! ! !
! ! ! !
Instruction Manual
! ! ! !
Before Use
There are two methods used in astrophotography of attaching the camera adapter to the
telescope. One is called Prime-Focus Photography and another is Eyepiece-Projection
Photography. With Eyepiece-Projection Photography, a T-ring appropriate for your SLR
camera is required. The T-ring is sold separately.
Prime-focus Photography
The telescope is used like a telephoto lens and light entering from the objective lens will
focus on the focal plane of a camera or a CCD imaging device to form an image. With
prime-focus photography, a telescope of 1,800mm in focal length becomes a 1,800mm
telephoto lens.
Taking photos of the moon, for example, allows the camera to be set at a faster shutter
speed. The longer the focal length of the telescope, the dimmer the celestial objects like
nebulae and star clusters. This will require a longer exposure time and more precise
tracking. A sturdy, high-precision equatorial mount is essential for successful
astrophotography.
Prime-Focus Photography is useful for photographs of the moon and the entire image of
nebulae or star clusters.
The Eyepiece Projection Camera Adapter is not necessary for Prime-Focus Photography.
Eyepiece-Projection Photography
The Eyepiece-Projection Photography method takes photos of a magnified image through
an eyepiece attached in the back of the telescope as shown in the figure below.
- 1 -