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By Stephen F Tonkin

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6 mm) of fully illuminated field at the focal plane. Fans of low-power, wide-field eyepieces might desire a larger field of full illumination, but for my purposes I find this small secondary completely adequate. 5% obstruction, certainly not large enough to perceptibly alter the image. Mounting the Mirrors To eliminate all unnecessary sources of diffraction, attention should be given to how the primary and secondary mirrors are mounted. Traditionally, the primary is mounted in some kind of cell and held in place by three or four clips.

Because of the nature of the Teflon, the holes in the strips tend to close up, rather than loosen and tighten around the threads, locking the screws in position. Since the Teflon strips are secured at each end by the four pairs of screws, the strips do not require anchoring to the wall of the tube in order to hold the screws tightly. After installation into the holder tube, the eight screws adjust the stalk's position. The screws, while held firmly by the expanding Teflon, easily adjust with an Allen key.

This is most easily done with your arm braced and the mirror slowly rotating on a Lazy Susan bearing or other turntable. Similar attention should be given to the secondary mirror's rim. Some secondary holders leave only the functioning aluminised surface exposed, but if yours does not, carefully go over the partly aluminised edge area that faces the focuser. If the very thought of going near these pristine shiny mirror surfaces with matt-black paint makes you break out in a cold sweat, skip these steps.

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