View from in front of the telescope with the dew shield shifted upper right.

Note the baffle free rear zone inside the dew shield. This four inch long section slides over the OTA tube. You can see the four inch section shown from a side view below. This illustrates the amount of overlap. The inside wall of the dew shield was drawn white so the baffling could be more easily detected by the viewer. It would also be flat black.
 

 
 

OTA only

OTA with rings

Rings only