Quote:
Originally Posted by toryglen-boy
The next thing to do, is to flock the inside of the OTA i guess
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Flocking won't help with that but it doesn't hurt to flock your tube. I'm pretty convinced those donuts are star reflections from the CCD glass on to the back of the glass of the MPCC. So it shines back on the sensor as a secondary out of focus star. They will only happen on stars that are relatively central or on axis. Off axis stars will still have the reflection but it is off the field of view. I did extensive testing with and without MPCC, different spacing, etc... when I flocked and aligned the optics on my newt. I doug's case the TAK image circle is so flat and wide that he probably has a fair distance between the camera CCD and the first piece of glass inside the OTA and I suspect that's enough to get rid of any potentail reflections from the CCD glass because it's too far to affect the built-in flattener?