Celestron CPC 925 Manuale d'uso - Pagina 3

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Screw the visual back threaded ring onto the short threaded tube on the back of the telescope. The

threaded ring can be loosened (and then retightened) at any time during your observing session if

you need to tilt the star diagonal and eyepiece to a different angle for easier access.

Insert the eyepiece with the largest MM number on it, most likely 25mm. The bigger the mm

number the wider field of view the eyepiece provides. Having a wide field of view usually make it

much easier to find and observe objects than narrow field eyepieces, such as a 10mm.

Provided the telescope is not aiming anywhere towards the Sun, remove the dustcover from the

front lens.

Aligning the finderscope with the telescope

Make sure you never point the telescope or finderscope towards the sun at any time!

If the finderscope does not point to the same patch of sky as the main telescope it will be very

difficult to complete the 2-star alignment procedure (explained below). In essence, the finderscope

and main telescope would be "cross-eyed", and aim in different direction.

There are three alignment screws (one is a nylon bolt) on the rear of the finderscope. By screwing

these screws in/out you can move where the crosshairs in the finderscope point. You need to

unscrew one side in order to be able to screw an opposite screw inwards.

Unscrew the declination knob and the right ascension knob. Point the main telescope at a distinctive

object, such as a power pole, about 100m or more away. Center a distinctive point such as an

insulator on the pole top (example A below). Tighten both knobs again to stop the telescope from

moving.

Now look through the finderscope. It may not be pointing exactly at the insulator on the pole

(example B below). But you need to make it do so. Use the three adjustment screws on the rear of

the finderscope to place the crosshairs over the same insulator (example C below) centered in the

main telescope view.