Quote:
Originally Posted by Starkler
I cant see any point of baffles in a netwonian OTA.
Baffles work where they are between your eye and the light source that you want to block out. In the case of baffles in the main newt OTA, you are viewing the illuminated side of the baffle.  The only baffles that makes sense are inside the focuser, or behind the primary mirror to stop light from being seen from the back. |
Yep. It is not a refractor. The focuser baffle can be in front of the focuser too if there is enough clearance. It also means that a baffle placed behind the secondary to block light sneaking in over the top of the OTA can be smaller. Flocking anything you can see though the focuser (mainly on the top end) also helps a bit.
Adding an extension tube around all the way the OTA is something people do sometimes if there is lots of excessive stray light as well.