Yesterday we took a FirstLook at the HoTech "self-centering" adapter. Today we will show the installation and discuss a bit more about why this 2" SCA T-adapter is an improvment over the traditional T-adapter.
The scope we used for this installaion was the Meade LX200 GPS. Unlike the Celestron C8, the LX200 has a removable 2" threaded ring. The ring is held in place by the two thumbscrews at the bottom (red arrows).
The 2" ring threads on to the normal T-Adapter on one end and the camera adapter threads on the other end. In order to hold the entire assembly in place, the thumbscrews push from the bottom. Even though the tolerance is very tight, a slight mis-alignment due to the uneven forces is unavoidable with the thumbscrew approach. The slight difference in pressure will cause a detectable shift of the imaging plane.
The HoTech approach to holding the adapter in place is to use three gaskets. The gaskets are forced to press outwards when the end rings are tightened. This outward movement forces the adapter to center itself inside the opening of telescope.
The end of the adapter is threaded to accept a camera body adapter. The type of mount is specific to the camera manufacturer (Nikon, Canon, etc..). A different one is needed for each make. Fortunately, this piece is only about $10 on EBay.
Shown above is the Nikon D40 mounted to the Meade LX200 using the HoTech 2" SCA T-Adapter. Here is a close-up image of the adapter assembly. The HoTech approach solved a long-standing problem imaging problem. We are eager to see if we can see the difference. [Permalink] - HoTech SCA T-adapter installation