Bedienungsanleitung Meade ETX-90AT (Seite 40 von 60) (Englisch)

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Photography with a 35mm Camera

Photography through your ETX model requires the addition of the optional #64

T-Adapter (see OPTIONAL ACCESSORIES, page 43). With the #64 T-Adapter attached

to the telescope (

Fig. 28), through-the-telescope photography is possible with any

35mm camera body with a removable lens. In this way the telescope effectively

becomes the lens of the camera.

For through-the-telescope photography, turn the flip-mirror control (5, Fig. 28) to the

“down” position, allowing light to pass straight through the telescope and out the photo

port (

Figs. 29a and 29b). With the flip-mirror control in the “down” position and the

photo port’s dust cover removed, you can see the front lens of the telescope when you

look through the photo port. The #64 T-Adapter threads onto the photo port, followed

by a T-mount for the particular brand of 35mm camera being used, followed by the

camera body (with the camera lens removed).

The #64 T-Adapter consists of two sections (

1 and 2, Fig. 28), which are threaded

together in shipment. You may use either of the following photographic mounting

formats to couple the camera body to the telescope’s photo port thread.

• Format 1: Camera Body + T-Mount + Section (1) of the #64 T-Adapter (7, Fig. 28).

ETX-90AT 1250mm at f/13.8

ETX-105AT 1640mm at f/15.6

ETX-125AT 1900mm at f/15

Format 1 utilizes only the short section of the #64 T-Adapter to permit close-coupling

of a camera body to the telescope. In this format vignetting will occur; the

photographic image will appear on film with a slight darkening at the corners of the

35mm frame (see

Fig. 30).

• Format 2: Camera Body + T-Mount + Sections (1) and (2) of the #64 T-Adapter (see

Fig. 28).

ETX-90AT 1450mm at f/16

ETX-105AT 1830mm at f/17.4

ETX-125AT 2310mm at f/18

Format 2 utilizes both sections of the #64 T-Adapter threaded together to form a rigid

unit. In this configuration there is no field vignetting; images are illuminated to the

edges of a standard 35mm frame (see Fig.

31).

To frame an object in the viewfinder of the 35mm camera body, slightly loosen the

knurled attachment ring (3, Fig. 28), which threads the #64 T-Adapter to the

telescope’s photo port; rotate the camera body to achieve proper framing of the

object; then re-tighten the knurled ring.

PHOTOGRAPHY

Fig. 28: Example of photography through the ETX using the #64 T-Adapter: (1) Short

section of #64 T-Adapter; (2) Extension section of #64 T-Adapter; (3) Knurled attachment ring;

(4) T-mount; (5) Flip-

mirror control in “down” position; (6) 35mm camera body; (7) Format 1.

Fig. 29a: Flip mirror control in

the “up” position.

Fig. 29b: Flip mirror control in

the “down” position.

Fig. 30: Example of a format

1 photo.

Fig. 31: Example of a format

2 photo.

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