Celestron 102AZ 660mm focal length & mount.
The mount is very sturdy for this lightweight OTA; the problem is the mount head bolt is epoxy fixed, so the head cannot be replaced. The scope itself has the longer 660mm focal length, as compared to the standard 600 of most 100mm objectives. The doublet achro lens are single coated for anti reflections; however, this does not detract from image quality. The lens housing is plastic. The dew shield is too short to be effective at reducing light reflections. The 2" focuser has the longer tube, to accomodate the longer focal length; as it would seem the normal 600mm scopes actually use the same scope tube. Chromatic abberations are not bad for a semi-fast f/6.5 telescope. Whereas an f/5 scope will give nice purple fringing on bright objects, such as Sirius; the 102AZ gave a smaller blueish fringe. The small dovetail attached directly to the scope tube is not as effective as would be an actual system of scope rings with an 8" dovetail. The lens quality is quite good and would benefit from upgraded rings/dovetail, double speed focuser, longer dew shield, & better lens housing.
Verified purchase: YesCondition: Pre-owned