Astrophotography adapter: T2 (m42 thread) to 2inches (50.8mm) with 48mm filter thread and DSLR support

UPDATE4: Included the SCAD source files. Note that the "threads.scad" is a dependency needs to be placed in the same folder as the other. I will cleanup these files, for now just dumping for people to use it.

UPDATE3: Model for DSLR internal taper is now longer (instead of a 45deg it runs from male thread to female thread), which makes it more sturdy against compression when installing on the telescope and that goes without losing any field of view.

UPDATE2: Included a model for attaching