p Left: With an inside diameter of 185 mm, the HNT's oversized tube is lined with black flocking to reduce internal reflections. The focuser and fittings do not intrude into the light path. While the secondary mirror supports are sturdy, their width introduces bright, long diffraction spikes to images with bright stars. Right: The tube rings have multiple bolt holes for attaching user-supplied plates and rings, or one of the two supplied dovetail bars. The Losmandy D-style plate is shown here. ping the slots. Instead, I set the T-ring so my camera clicked onto the focuser with north up (my preferred orientation for most shots) and just left it there for all my testing. A better method of rotating the camera would increase the versatility of the instrument, particularly for an astrograph. The HNT's tube has a small dovetail bracket that will accept the standard mounting shoes on many finderscopes or small guide scopes. The slotted carrying handle on the top could also be used to bolt on a guide scope. The telescope's tube rings each have five ¼-20-threaded holes on their top and bottom surfaces for adding your own mounting plates and dovetail bars if needed. The HNT, however, does come with two: a narrow Vixen-style and a wider Losmandy-style dovetail bar. The tube assembly is light, at only 5.8 kilograms (12.8 lbs) and so will work well on lighter and affordable mounts p A raw image with only a mild contrast boost applied shows the HNT's level of vignetting over a full-frame image with the mirrorless Canon EOS Ra. Blow-ups of the corners show the degree of aberrations present with the corrector lens at its default position at the bottom of the focuser. sk yandtelescope.org * SEP TEMBER 2 02 0 71http://www.skyandtelescope.org