leinad.
1. the extender could be the problem. try removing the adapter and extender, winding your focuser right in and then hold the camera as close to the focuser (or inside it if you can) and see if it will come closer to focus. Alternatively try using a barlow. The problem may be that your mirror may be too far down the tube for imaging with that particular camera.
3. If your secondary has a center bolt, make sure you loosen that first or you will find it very difficult to adjust the three outer screws. I'd suggest seeing if you can find someone in your area that has a newt that can show you how to adjust the secondary. It is 1000 times easier when you can see someone else doing it first
