Reliable adapters from telescopes to cameras are built from end to end assemblies (trains) of cylindrical adapters and auxiliary lenses screwed together so that they will maintain focus and not slip or flex. A typical adapter train for prime focus imaging is shown below. It includes the Questar swivel adapter, a 42mm P to T thread adapter, and a T-ring adapter to a Sony E-mount bayonet. The use of Barlow lenses or eyepiece projection requires additional components. See the Camera connection notefor examples.
In the simplest case with camera lens mounts supported by Questar, just two parts are required: a swivel adapter that screws into the rear axial port of the Questar and an adapter from the swivel to the specific lens mount used by your Questar supported camera. If you use a camera not supported by Questar or wish to add additional lenses in your optical path, things get more complicated. This page is a reference listing most of the screw standards that you may encounter. These often have multiple similar names.
There are normally at least several adapter parts required to attach your camera. There are also multiple similar but incompatible threading standards. This can make a simple task complicated, because cross threading similar but incompatible parts can damage them. Let's start with a summary of the kinds of adapter parts and then list the thread standards that they use:
Standards for connecting optical parts have evolved during the long life of the Questar. These are often very similar and parts can be damaged if slightly different but incompatible threaded parts are screwed together. As a result it isn't unusual to have to include parts who have no optical purpose, only adapting different thread standards.
Content created: 2019-03-09 and last modified: 2019-05-08
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