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!!!!Eyepiece Projection Camera Adapter !!!!!!!!!!!!!

Instruction Manual

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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.

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Summary of content (5 pages)

PAGE 1
! ! ! ! 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.
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The eyepiece inserted must be able to fit into the Eyepiece Projection Camera Adapter. (The biggest 31.7mm eyepiece allowable is 48mm in outer diameter and 90mm in length.) It is ideal for taking close-ups of small regions of the moon and details of the planets. FYI: Using a method of Afocal Imaging photography with a compact digital camera is also good for taking photos of the planets. A small CCD area produces a large image of the planets without excessively boosting magnification.
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Distance (L) to the Focal Plane (Reference) The table below shows distances between the focal plane on the camera with Pentax K-mount and the rear lens surface of the eyepieces applicable to the Eyepiece Projection Camera Adapter. Size of Image on the Focal Plane (The size of the planets changes as they come close to and go away from the earth.
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Duration of the Exposure The table below is an example for standard exposure duration with use of ISO400 films. If ISO 100 films are used, increase the value by 4 times. If ISO1600 films are used, decrease the value by a fourth. (Unit: Second) Taking photos of a Lunar Eclipse Duration of the exposure varies as the moon wanes and waxes during an eclipse.
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Photographic Accessory Chart Note: If your purchase of the Vixen refracting telescope or catadioptric telescope does not come with the flip mirror, a complete set of 60mm thread-diameter extension tube, downsizing ring and 42mm to 31.7mm eyepiece adapter may be needed to attach the eyepiece projection camera adapter. Vixen Co., Ltd. http:/www.vixen.co.