Can a telescope be used as a powerful lens for your DSLR camera? The answer is yes, as demonstrated in Fotodiox’s video below. In this case a Meade ETX90 is used as a 1250mm lens for prime focus terrestrial photography. The ETX’s motorized fork mount and fine adjustment controls prove particularly useful.
Typically, two adapters are required to attach a DSLR camera to the ETX telescope for prime focus photography. The first screws to the rear photo port of the ETX telescope. The output is a standard photographic male T-thread (M42 x 0.75mm). There are two such adapters depending on the ETX model as shown below.
Meade #64 T-Adapter for ETX90/105/125
For larger ETX telescopes such as the ETX90 and above, the Meade #64 T-Adapter (SKU: 07363) should be used.
Meade #64ST T-Adapter for ETX60/70/80
For smaller ETX telescopes such as the ETX80 and below, the Meade #64ST T-Adapter (SKU: 07366) should be used.
A second adapter, often referred to as a T-ring, is required for the DSLR camera. There are many such adapters depending on the camera brand. Meade supplies adapters for Canon EOS DSLR and Nikon DSLR cameras. The T-ring screws at the front of the DSLR camera (instead of the lens). The result is a female T-thread (M42 x 0.75mm) that will fit the appropriate #64 T-adapter or #64ST T-Adapter attached to the telescope as described previously.
Meade Canon EOS T-Mount
The Canon EOS T-Mount (SKU: 07384) is required for Canon DSLR cameras. This is often referred to as a Canon T-ring (M42 x 0.75mm) female.
Meade Nikon DSLR T-Mount
The Nikon T-Mount (SKU: 07378) is required for Nikon DSLR cameras. Often referred to as a Nikon T-ring (M42 x 0.75mm) female.
Other companies supply similar T-ring adapters that will fit DSLRs from other camera manufacturers in addition to Nikon and Canon.