Prototype of an astrograph - Part 2 (Newtonian telescope)

After initial tests under the starry sky with the prototype of the Newtonian 200 PDS Astrograph MK I, the next step is to improve the collimation.

Previously, the Imagetrain was adjusted using 2 x 3 Allen screws directly on the Imagetrain (where it is inserted into the 2" tube). To put it simply: a miserable fiddly job.

So how can we improve it?

On the 200 PDS Astrograph MK II, the collimation has now been moved outward, toward the edge. A ring is screwed onto the Newtonian on the outside of the front end of the tube.

The Imagetrain mount is attached to this using push-and-pull screws. It can then be collimated using these screws.

An adapter was co-developed to allow existing dew shields to be used.

Here is the exploded view:

To be continued...

Your Karsten