|
The MN190 Is an astrograph, and designed for Astrophotography.
One aspect of that configuration, is the secondary mirror is oversize compared to a normal Newtonian. The reason for that, is to ensure all of the light cone returning from the main mirror, is intercepted, and diverted to the focuser, without any vignetting, which simply means no light is lost due to passing by the edge of the secondary mirror. It may well appear odd as you look at the various elements in the system as reflected back to your eye.
Whatever method used to collimate a telescope, the star test is the only one that will reveal anything amiss with the optical alignments.
Try upgrading the focuser, I would expect you also fitted a set of Bobs Knobs to aid easier collimation. If not, it is a desirable thing to do.
|